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Nissan almera b10 2006-2010, Guías, Proyectos, Investigaciones de Mecánica

diagramas eléctricos de computadora

Tipo: Guías, Proyectos, Investigaciones

2022/2023

Subido el 04/05/2023

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ENGINE CONTROL SYSTEM
SECTION
EC
CONTENTS
PRECAUTIONS AND PREPARATION
Precautions .................................................................. 5
Preparation................................................................... 9
INDEX FOR DTC
DTC No. Index ........................................................... 11
ENGINE CONTROL SYSTEM
General ....................................................................... 13
ECCS Controls .......................................................... 13
System Diagram........................................................ 14
Vacuum Hose Drawing............................................. 1 5
System Chart ............................................................. 16
Multiport Fuel Injection (MFI) System................... 1 6
Mixture Ratio Feedback Control (Closed Loop
Control) ....................................................................... 17
Electronic Ignition (EI) System .............................. 18
Air Conditioning Cut Control................................... 19
Fuel Cut Control (At No Load and High Engine
Speed) ......................................................................... 20
CAN Communication ................................................ 2 0
A/T Models ................................................................. 21
BASIC SERVICE PROCEDURE
Idle Speed and Ignition Timing Check .................. 2 2
Accelerator Pedal Released Position Learning ...23
Throttle Valve Closed Position Learning .............. 23
Idle Air Volume Learning ......................................... 2 4
Operation Procedure ................................................ 24
Fuel Pressure Check ................................................ 26
Fuel Pressure Check ................................................ 27
Injector ........................................................................ 28
TROUBLE DIAGNOSIS
Trouble Diagnosis Introduction ..............................3 1
Work Flow................................................................... 32
Description for Work Flow....................................... 3 3
Diagnostic Worksheet ..............................................3 4
Worksheet Sample.................................................... 3 5
DTC Inspection Priority Chart ................................ 35
Fail-safe Chart........................................................... 36
Basic Inspection ........................................................ 3 8
Symptom Matrix Chart .............................................4 4
Engine Control Component Parts Location.......... 4 8
Circuit Diagram .........................................................5 2
ECM Harness Connector Terminal Layout ........... 5 3
ECM Terminals and Reference Value.................... 53
ECM Inspection Table .............................................. 5 3
CONSULT-II Function............................................... 60
Engine Control Component Parts/Control Systems
Application.................................................................. 6 1
Work Support Mode.................................................. 63
Self-diag Results Mode............................................ 63
Data Monitor Mode ................................................... 64
Active Test Mode....................................................... 6 7
Real Time Diagnosis In Data Monitor Mode (Re-
cording Vehicle Data)............................................... 68
Major Sensor Reference Graph in Data Monitor
Mode ............................................................................ 72
CLSD THL POS, ACCEL SEN 1, THRTL SEN 1...72
ENG SPEED, MAS A/F SE-B1, THRTL SEN 1,
HO2S1 (B1), INJ PULSE-B1 ................................... 7 2
POWER SUPPLY CIRCUIT FOR ECM
Wiring Diagram .........................................................7 5
Diagnostic Procedure ............................................... 7 6
Component Inspection ............................................. 80
DTC U1000, U1001 CAN COMMUNICATION LINE
Description ................................................................. 81
On Board Diagnosis Logic ...................................... 81
DTC Confirmation Procedure.................................. 8 1
Wiring Diagram .........................................................8 2
Diagnostic Procedure ............................................... 8 3
DTC P1065 ECM POWER SUPPLY
Component Description ........................................... 85
DTC Confirmation Procedure.................................. 8 5
Wiring Diagram .........................................................8 6
Diagnostic Procedure ............................................... 8 7
DTC P0340 CAMSHAFT POSITION SENSOR
(PHASE) CIRCUIT
Component Description ........................................... 89
On Board Diagnosis Logic ...................................... 89
DTC Confirmation Procedure.................................. 8 9
Wiring Diagram .........................................................9 1
Diagnostic Procedure ............................................... 9 2
Component Inspection ............................................. 95
Removal and Installation......................................... 95
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ENGINE CONTROL SYSTEM

SECTION EC

CONTENTS

DTC P0340 CAMSHAFT POSITION SENSOR

CONTENTS

DTC P0335 CRANKSHAFT POSITION SENSOR
DTC P0102, P0103 MASS AIR FLOW SENSOR
DTC P0112, P0113 INTAKE AIR TEMPERATURE
DTC P0117, P0118 ENGINE COOLANT TEMPERA-
DTC P1217 ENGINE OVER TEMPERATURE (OVER-
DTC P0122, P0123 THROTTLE POSITION SENSOR-
DTC P1121 ELECTRIC THROTTLE CONTROL
DTC P1122 ELECTRIC THROTTLE CONTROL
DTC P1124, P1126 THROTTLE CONTROL MOTOR
DTC P1128 THROTTLE CONTROL MOTOR CIRCUIT

CONTENTS

DTC P0550 POWER STEERING PRESSURE SEN-

DTC P0132 HEATED OXYGEN SENSOR - FR CIR- DTC P0134 HEATED OXYGEN SENSOR - FR CIR- DTC P0138 HEATED OXYGEN SENSOR - DTC P0031, P0032 HEATED OXYGEN SENSOR DTC P0037, P0038 HEATED OXYGEN SENSOR

Vacuum Lines in Evaporative Emission System

  • Precautions PRECAUTIONS AND PREPARATION
  • Preparation
  • DTC No. Index INDEX FOR DTC
  • General ENGINE CONTROL SYSTEM
  • ECCS Controls
  • System Diagram
  • Vacuum Hose Drawing
  • System Chart
  • Multiport Fuel Injection (MFI) System
  • Control) Mixture Ratio Feedback Control (Closed Loop
  • Electronic Ignition (EI) System
  • Air Conditioning Cut Control
  • Speed) Fuel Cut Control (At No Load and High Engine
  • CAN Communication
  • A/T Models
  • Idle Speed and Ignition Timing Check BASIC SERVICE PROCEDURE
  • Accelerator Pedal Released Position Learning
  • Throttle Valve Closed Position Learning
  • Idle Air Volume Learning
  • Operation Procedure
  • Fuel Pressure Check
  • Fuel Pressure Check
  • Injector
  • Trouble Diagnosis Introduction TROUBLE DIAGNOSIS
  • Work Flow
  • Description for Work Flow
  • Diagnostic Worksheet
  • Worksheet Sample
  • DTC Inspection Priority Chart
  • Fail-safe Chart
  • Basic Inspection
  • Symptom Matrix Chart
  • Engine Control Component Parts Location
  • Circuit Diagram
    • ECM Harness Connector Terminal Layout
    • ECM Terminals and Reference Value
    • ECM Inspection Table
    • CONSULT-II Function
    • Application Engine Control Component Parts/Control Systems
    • Work Support Mode
    • Self-diag Results Mode
    • Data Monitor Mode
    • Active Test Mode
    • cording Vehicle Data) Real Time Diagnosis In Data Monitor Mode (Re-
    • Mode Major Sensor Reference Graph in Data Monitor
    • CLSD THL POS, ACCEL SEN 1, THRTL SEN
    • HO2S1 (B1), INJ PULSE-B1 ENG SPEED, MAS A/F SE-B1, THRTL SEN 1,
    • Wiring Diagram POWER SUPPLY CIRCUIT FOR ECM
    • Diagnostic Procedure
    • Component Inspection
    • Description DTC U1000, U1001 CAN COMMUNICATION LINE
    • On Board Diagnosis Logic
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Description DTC P1065 ECM POWER SUPPLY
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Description (PHASE) CIRCUIT
    • On Board Diagnosis Logic
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Removal and Installation
  • Component Description (POS) CIRCUIT
  • On Board Diagnosis Logic
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Removal and Installation
  • Component Description CIRCUIT
  • On Board Diagnosis Logic
  • Fail-Safe Mode
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Component Description SENSOR CIRCUIT
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Component Description TURE SENSOR CIRCUIT
  • On Board Diagnosis Logic
  • Fail-Safe Mode
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Removal and Installation
  • Component Description DTC P0350 IGNITION SIGNAL PRIMARY
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Condenser
  • Ignition Coil with Power Transistor
  • Removal and Installation
  • System Description HEAT)
  • Operation
  • On Board Diagnosis Logic
  • Overall Function Check
  • Wiring Diagram
  • Diagnostic Procedure
  • Main 12 Causes of Overheating
  • Component Inspection
  • Component Description DTC P0327, P0328 KNOCK SENSOR CIRCUIT
  • On Board Diagnosis Logic
  • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Removal and Installation
    • Component Description 2 CIRCUIT
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Remove and Installation
    • Component Description ACTUATOR
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Procedure for Malfunction A and B
    • Procedure for Malfunction C
    • Diagnostic Procedure
    • Remove and Installation
    • Description PERFORMANCE PROBLEM
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Throttle Control Motor
    • Remove and Installation
    • Component Description RELAY CIRCUIT
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Procedure For DTC P1124
    • Procedure For DTC P1126
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Component Description SHORT
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Remove and Installation
    • Component Description SOR LEARNING PERFORMANCE PROBLEM
    • On Board Diagnosis Logic
    • DTC Confirmation Procedure
    • Diagnostic Procedure
    • Remove and Installation
    • Component Description SOR LEARNING PERFORMANCE PROBLEM
    • On Board Diagnosis Logic
    • DTC Confirmation Procedure
    • Diagnostic Procedure
    • Remove and Installation
    • On Board Diagnosis Logic SHORT
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
  • DTC P2122, P2123 ACCEL SENSOR -
    • Component Description
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Remove and Installation
  • DTC P2127, P2128 ACCEL SENSOR -
    • Component Description
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Remove and Installation
    • Component Description DANCE PROBLEM
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Remove and Installation
    • Component Description SOR CIRCUIT RANGE/ PERFORMANCE PROBLEM
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
      • Wiring Diagram
      • Diagnostic Procedure
      • Component Inspection
      • Remove and Installation
      • Description DTC P0500 VEHICLE SPEED SENSOR
      • On Board Diagnosis Logic
      • DTC Confirmation Procedure
      • Wiring Diagram
      • Diagnostic Procedure
      • Description SOLENOID VALVE CIRCUIT
      • Component Description
      • On Board Diagnosis Logic
      • DTC Confirmation Procedure
      • Wiring Diagram
      • Diagnostic Procedure
      • Component Inspection
      • Removal and Installation
      • Description SOLENOID VALVE
      • Component Description
      • Wiring Diagram
      • Diagnostic Procedure
      • Component Inspection
      • Removal and Installation
      • Component Description INJECTOR CIRCUIT
      • Wiring Diagram
      • Diagnostic Procedure
      • Component Inspection
      • Removal and Installation
      • On Board Diagnosis Logic TOO LEAN
      • DTC Confirmation Procedure
      • Wiring Diagram
      • Diagnostic Procedure
      • On Board Diagnosis Logic TOO RICH
      • DTC Confirmation Procedure
      • Wiring Diagram
      • Diagnostic Procedure
      • Description FUEL PUMP CIRCUIT
      • Component Description
      • Wiring Diagram
      • Diagnostic Procedure
      • Component Inspection
  • Component Description SOR CIRCUIT
  • On Board Diagnosis Logic
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Component Description CUIT HIGH VOLTAGE
  • On Board Diagnosis Logic
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Removal and Installation
  • Component Description CUIT NO ACTIVITY DETECTED
  • On Board Diagnosis Logic
  • Overall Function Check
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Removal and Installation
  • Description HEATED OXYGEN SENSOR 1 HEATER (FR)
  • Operation
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Removal and Installation
  • Component Description HEATED OXYGEN SENSOR 1 (FR)
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • Removal and Installation
  • Component Description RR CIRCUIT HIGH VOLTAGE
  • On Board Diagnosis Logic
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
  • System Description HEATER CONTROL CIRCUIT - FR
  • Operation
  • On Board Diagnosis Logic
  • DTC Confirmation Procedure
  • Wiring Diagram
  • Diagnostic Procedure
  • Component Inspection
    • System Description HEATER CONTROL CIRCUIT - RR
    • Operation
    • On Board Diagnosis Logic
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Wiring Diagram ELECTRICAL LOAD SIGNAL
    • Diagnostic Procedure
    • Description DTC P1805 BRAKE SWITCH
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Inspection
    • Component Description PARK/NEUTRAL POSITION (PNP) SWITCH
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Description REFRIGERANT PRESSURE SENSOR
    • Wiring Diagram
    • Diagnostic Procedure
    • Component Description DTC P0605 ENGINE CONTROL MODULE
    • On Board Diagnosis Logic
    • Fail-Safe Mode
    • DTC Confirmation Procedure
    • Wiring Diagram
    • Description EVAPORATIVE EMISSION SYSTEM
    • Component Inspection
    • Description POSITIVE CRANKCASE VENTILATION
    • Component Inspection
    • Fuel Pressure SERVICE DATA AND SPECIFICATIONS (SDS)
    • Idle Speed and Ignition Timing
    • Mass Air Flow Sensor
    • Intake Air Temperature Sensor
    • Engine Coolant Temperature Sensor
    • Crankshaft Position Sensor (POS)
    • Crankshaft Position Sensor (PHASE)
    • Throttle Control Motor
    • Injector
    • Fuel Pump

PRECAUTIONS AND PREPARATION [QG16]

Supplemental Restraint System (SRS) “AIR BAG”

and “SEAT BELT PRE-TENSIONER”

WARNING:

  To install/remove the SRS airbag, pretensioner seatbelt sys-

tem related components and harness, turn the ignition switch

“OFF”, disconnect the battery terminals and wait over 3 min-

utes. (This is to discharge all the remaining electricity in the

airbag sensor unit’s auxiliary power circuit.)

  Do not use air impact or electrical tools when installing/re-

moving the components.

  Do not use any hand-held tools for harness used in SRS airbag

and pretensioner seatbelt systems. Be careful with the har-

ness not to tangle with or interfere with other components.

 ^ Do not use any electrical test equipments such as circuit tester

when inspecting the SRS airbag and pretensioner seatbelt

circuit while installed unless the Service Manual instructs to

do so. (The weak current in the tester can cause the SRS airbag

to operate.)

  Do not insert any foreign materials such as a screwdriver in

the airbag module and pretensioner seatbelt connector in or-

der to prevent unintended operation due to static electricity.

  The harnesses used in SRS airbag and pretensioner are cov-

ered with yellow insulation for easy identification.

  Refer to “RS Restraint System” in this Service Manual for safe

airbag system service information.

ON BOARD DIAGNOSTIC (OBD) SYSTEM OF ENGINE

The ECM has an on board diagnostic system. It will light up the

malfunction indicator (MIL) to warn the driver of a malfunction

causing emission deterioration.

CAUTION:

  Be sure to turn the ignition switch OFF and disconnect the

battery ground cable before any repair or inspection work.

The open/short circuit of related switches, sensors, sole-

noid valves, etc. will cause the MIL to light up.

  Be sure to connect and lock the connectors securely after

work. A loose (unlocked) connector will cause the MIL to

light up due to the open circuit. (Be sure the connector is

free from water, grease, dirt, bent terminals, etc.)

  Be sure to route and secure the harnesses properly after

work. The interference of the harness with a bracket, etc.

may cause the MIL to light up due to the short circuit.

  Be sure to erase the unnecessary malfunction informa-

tion (repairs completed) from the ECM before returning

the vehicle to the customer.

Precautions

PRECAUTION

 Always use a 12 volt battery as power source.

 Do not attempt to disconnect battery cables while engine is

running.

 Before connecting or disconnecting the ECM harness con-

nector, turn ignition switch OFF and disconnect battery ground

cable. Failure to do so may damage the ECM because bat-

tery voltage is applied to ECM even if ignition switch is turned

off.

 Before removing parts, turn ignition switch OFF and then

disconnect battery ground cable.

PRECAUTIONS AND PREPARATION [QG16]

Precautions (Cont’d)

 After performing each TROUBLE DIAGNOSIS, perform DTC

Confirmation Procedure or Overall Function Check. The DTC

should not be displayed in the DTC Confirmation Procedure

if the repair is completed. The Overall Function Check should

be a good result if the repair is completed.

 When measuring ECM signals with a circuit tester, connect

a break-out box and Y-cable adapter between the ECM and

ECM harness connector.

 When measuring ECM signals with a circuit tester, never al-

low the two tester probes to contact. Accidental contact of

probes will cause a short circuit and damage the ECM power

transistor.

 Do not use ECM ground terminals when measuring input/

output voltage. Doing so may result in damage to the ECM’s

transistor. Use a ground other than ECM terminals, such as

the ground.

 Do not operate fuel pump when there is no fuel in lines.

 Tighten fuel hose clamps to the specified torque.

[QG16] PRECAUTIONS AND PREPARATION

Precautions (Cont’d)

 Do not depress accelerator pedal when starting.

 Immediately after starting, do not rev up engine unneces-

sarily.

 Do not rev up engine just prior to shutdown.

 When installing C.B. ham radio or a mobile phone, be sure

to observe the following as it may adversely affect electronic

control systems depending on installation location.

  • Keep the antenna as far as possible from the electronic

control units.

  • Keep the antenna feeder line more than 20 cm (8 in) away

from the harness of electronic controls. Do not let them

run parallel for a long distance.

  • A d j u s t t h e a n t e n n a a n d f e e d e r l i n e s o t h a t t h e

standingwave radio can be kept smaller.

  • Be sure to ground the radio to vehicle body.

Wiring Diagrams and Trouble Diagnosis

When you read wiring diagrams, refer to the following:

 “HOW TO READ WIRING DIAGRAMS”, GI-

 “POWER SUPPLY ROUTING”, EL-5 for power distribution

circuit

When you perform trouble diagnosis, refer to the following:

 “HOW TO PERFORM EFFICIENT DIAGNOSES FOR AN

ELECTRICAL INCIDENT”, GI-14.

[QG16] PRECAUTIONS AND PREPARATION

MEMO:

[QG16]

Items (CONSULT-II Screen Terms) NO DTC IS DETECTED. FURTHER TESTING MAY BE REQUIRED. CAN COMM CIRCUIT CAN COMM CIRCUIT

HO2S1 HTR (B1) HO2S1 HTR (B1) HO2S2 HTR (B1) HO2S2 HTR (B1) MAF SEN/CIRCUIT MAF SEN/CIRCUIT IAT SEN/CIRCUIT IAT SEN/CIRCUIT ECT SEN/CIRCUIT ECT SEN/CIRCUIT TP SEN 2/CIRC TP SEN 2/CIRC HO2S1 (B1) HO2S1 (B1) HO2S2 (B1) FUEL SYS-LEAN-B FUEL SYS-RICH-B TP SEN 1/CIRC TP SEN 1/CIRC KNOCK SEN/CIRC-B KNOCK SEN/CIRC-B CKP SEN/CIRCUIT CMP SEN/CIRC-B IGN SIGNAL-PRIMARY VEH SPEED SEN/CIRC PW ST P SEN/CIRC ECM

ECM BACK UP/CIRC INT/V TIM V/CIR-B ETC ACTR ETC FUNCTION/CIRC ETC MOT PWR ETC MOT PWR ETC MOT

CONSULT-II
P
U
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U
P
P
P
P
P
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P
P
P
P
P
P
P
P
P
P
P
P
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P
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ECM

INDEX FOR DTC

Index for DTC

DTC No. Index

NOTE:

 If DTC U1000 or U1001 is displayed with other DTC, first perform the trouble diagnosis for

DTC U1000, U1001. Refer to EC-81, “DTC U1000, U1001 CAN COMMUNICATION LINE”.

O: Applicable X: Not applicable

DTC MIL

Lighting Up X X X X X X X X X X X X O O X X X X X X X X X X X X X X X X O X X X X X X X X

Reference Page

EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC- EC-

EC- EC- EC- EC- EC- EC- EC- EC-

EC- EC- EC- EC- EC- EC- EC-

ENGINE CONTROL SYSTEM [QG16]

General

The ECCS (Electronic Concentrated engine Control System)

controls the fuel injection, ignition timing and idle RPM as one

single control unit. CONSULT-II can check and diagnose ECCS

functions easily.

ECCS Controls

Control Item Description

Fuel injection control

Ignition timing control

Idle RPM control Fuel pump drive control

A/C cut control

Radiator fan control

Canister purge control Engine and automatic transaxle integrated control Fail-safe function Diagnosis system

 SOFIS control is adopted to enhance responses and exhaust efficiency by optimizing fuel injection amount.  It improves drivability by performing compensations under extreme condi- tions such as sudden oxygen changes through oxygen feedback learning control.  It minimizes exhaust gases by employing the oxygen sensor.  It optimizes the ignition timing at various circumstances by employing the hole IC type crankshaft position sensor.  It improves ignition performance by employing the DLI (Distributorless Ignition) system that has power transistor integrated ignition coil on each cylinder.  It optimizes ignition timing by employing the knock control that advances or retards ignition timing according to knocking conditions during different driving conditions and used fuel quality.  It controls idle speed by operating DC motor directly.  It controls the fuel pump relay on and off according to engine RPM signals.

 It minimizes engine load by turning the A/C relay off under high refrigerant pressure and high engine speed.  It controls the radiator fan relay on and off according to vehicle speed, coolant temperature and A/C signal.  It performs duty control on the canister according to driving conditions.  It minimizes gear shift shock by reducing the engine torque during gear changes.  It allows safety and emergency driving under system defectives.  It corresponds with CONSULT-II for easy diagnosing.

Engine Control System

[QG16] ENGINE CONTROL SYSTEM

System Diagram

[QG16] ENGINE CONTROL SYSTEM

Engine Control System (Cont’d)

System Chart

ECM Function Fuel injection & mixture ratio control Electronic ignition system Fuel pump control On board diagnostic system Intake valve timing control Heated oxygen sensor 1 heater control EVAP canister purge flow control

Air conditioning cut control

Cooling fan control

Input (Sensor)  Camshaft position sensor (PHASE)  Crankshaft position sensor (POS)  Mass air flow sensor  Engine coolant temperature sensor  Heated oxygen sensor 1  Throttle position sensor  Accelerator pedal position sensor  Park/neutral position (PNP) switch  Intake air temperature sensor  Power steering pressure sensor  Ignition switch  Stop lamp switch  Battery voltage  Knock sensor  Refrigerant pressure sensor  TCM (Transmission control module)*  Air conditioner switch  Vehicle speed signal  Electrical load signal

Output (Actuator) Fuel injectors Power transistor Fuel pump relay MIL (On the instrument panel) Intake valve timing control solenoid valve Heated oxygen sensor 1 heater EVAP canister purge volume control solenoid valve Air conditioner relay

Cooling fan relays

*1: This input signal is sent to the ECM through CAN communication line.

Multiport Fuel Injection (MFI) System

INPUT/OUTPUT SIGNAL CHART

Input Signal to ECM

Engine speed*1 and piston position

Amount of intake air Engine coolant temperature Density of oxygen in exhaust gas Throttle position Accelerator pedal position Gear position Engine knocking condition Battery voltage* Power steering operation Vehicle speed Air conditioner operation

Sensor Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Mass air flow sensor Engine coolant temperature sensor Heated oxygen sensor 1 Throttle position sensor Accelerator pedal position sensor Park/neutral position (PNP) switch Knock sensor Battery Power steering pressure sensor Vehicle speed signal Air conditioner switch

ECM Function

Fuel injection & mixture ratio control

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

Actuator

Fuel injectors

SYSTEM DESCRIPTION

The amount of fuel injected from the fuel injector is determined by the ECM. The ECM controls the

length of time the valve remains open (injection pulse duration). The amount of fuel injected is a pro-

gram value in the ECM memory. The program value is preset by engine operating conditions. These

conditions are determined by input signals (for engine speed and intake air) from the crankshaft posi-

tion sensor (POS), camshaft position sensor (PHASE) and the mass air flow sensor.

ENGINE CONTROL SYSTEM [QG16]

Engine Control System (Cont’d)

VARIOUS FUEL INJECTION INCREASE/DECREASE COMPENSATION

In addition, the amount of fuel injected is compensated to improve engine performance under various

operating conditions as listed below.

 During warm-up

 When starting the engine

 During acceleration

 Hot-engine operation

 When selector lever is changed from N to D (A/T models)

 High-load, high-speed operation

 During deceleration

 During high engine speed operation

Mixture Ratio Feedback Control (Closed Loop Control)

The mixture ratio feedback system provides the best air-fuel mixture ratio for driveability and emission

control. The three way catalyst (manifold) can then better reduce CO, HC and NOx emissions. This sys-

tem uses heated oxygen sensor 1 in the exhaust manifold to monitor if the engine operation is rich or lean.

The ECM adjusts the injection pulse width according to the sensor voltage signal. For more information

about heated oxygen sensor 1, refer to EC-247. This maintains the mixture ratio within the range of

stoichiometric (ideal airfuel mixture). This stage is referred to as the closed loop control condition.

OPEN LOOP CONTROL

The open loop system condition refers to when the ECM detects any of the following conditions. Feed-

back control stops in order to maintain stabilized fuel combustion.

 Deceleration and acceleration

 High-load, high-speed operation

 Malfunction of heated oxygen sensor 1 or its circuit

 Insufficient activation of heated oxygen sensor 1 at low engine coolant temperature

 High engine coolant temperature

 During warm-up

 After shifting from N to D (A/T models)

 When starting the engine

MIXTURE RATIO SELF-LEARNING CONTROL

The mixture ratio feedback control system monitors the mixture ratio signal transmitted from heated

oxygen sensor 1. This feedback signal is then sent to the ECM. The ECM controls the basic mixture

ratio as close to the theoretical mixture ratio as possible. However, the basic mixture ratio is not neces-

sarily controlled as originally designed. Both manufacturing differences (i.e., mass air flow sensor hot

film) and characteristic changes during operation (i.e., injector clogging) directly affect mixture ratio.

ENGINE CONTROL SYSTEM [QG16]

Engine Control System (Cont’d)

SYSTEM DESCRIPTION

The ignition timing is controlled by the ECM to maintain the

best airfuel ratio for every running condition of the engine. The

ignition timing data is stored in the ECM. This data forms the

map shown. The ECM receives information such as the injec-

tion pulse width and camshaft position sensor signal. Comput-

ing this information, ignition signals are transmitted to the power

transistor. e.g., N: 1,800 rpm, Tp: 1.50 msec A °BTDC During

the following conditions, the ignition timing is revised by the

ECM according to the other data stored in the ECM.

 At starting

 During warm-up

 At idle

 At low battery voltage

 During acceleration

The knock sensor retard system is designed only for emergen-

cies. The basic ignition timing is programmed within the anti-knock-

ing zone, if recommended fuel is used under dry conditions. The

retard system does not operate under normal driving conditions. If

engine knocking occurs, the knock sensor monitors the condition.

The signal is transmitted to the ECM. The ECM retards the igni-

tion timing to eliminate the knocking condition.

Input Signal to ECM Air conditioner ON signal Throttle valve opening angle

Engine speed*

Engine coolant temperature Battery voltage* Refrigerant pressure Power steering operation Vehicle speed

Sensor Air conditioner switch Throttle position sensor Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Engine coolant temperature sensor Battery Refrigerant pressure sensor Power steering pressure sensor Vehicle speed signal

ECM Function

Air conditioner cut control

Actuator

Air conditioner relay

*1: The ECM determines the start signal status by the signals of engine speed and battery voltage.

Air Conditioning Cut Control

INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

This system improves engine operation when the air conditioner is used.

Under the following conditions, the air conditioner is turned off.

 When the accelerator pedal is fully depressed.

 When cranking the engine.

 At high engine speeds.

 When the engine coolant temperature becomes excessively high.

 When operating power steering during low engine speed or low vehicle speed.

 When engine speed is excessively low.

 When refrigerant pressure is excessively low or high.

[QG16] ENGINE CONTROL SYSTEM

Engine Control System (Cont’d)

Input Signal to ECM Neutral position Throttle position Accelerator pedal position Engine coolant temperature

Engine speed

Vehicle speed

Sensor Park/neutral position (PNP) switch Throttle position sensor Accelerator pedal position sensor Engine coolant temperature sensor Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Vehicle speed signal

ECM Function

Fuel cut control

Actuator

Fuel injectors

Fuel Cut Control (At No Load and High Engine Speed)

INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

If the engine speed is above 3,950 rpm with no load (for example, in neutral and engine speed over

3,950 rpm) fuel will be cut off after some time. The exact time when the fuel is cut off varies based on

engine speed. Fuel cut will operate until the engine speed reaches 1,500 rpm, then fuel cut is cancelled.

NOTE:

 This function is different from deceleration control listed under. Refer to EC-16, “Multiport

Fuel Injection (MFI) System”.

CAN Communication

SYSTEM DISCRIPTION

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-

vehicle multiplex communication line with high data communication speed and excellent error detection

ability. Many electronic control units are equipped onto a vehicle, and each control unit shares informa-

tion and links with other control units during operation (not independent). In CAN communication, con-

trol units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of

information transmission with less wiring. Each control unit transmits/receives data but selectively reads

required data only.

CAM COMMUNICATION UNIT

Go to CAN system, when selecting your car model from the following table.

Body Type Axle Engine Transmission

ECM (CAN gate 1) ECM (CAN gate 2)

A/T
O
O
M/T

CAN communication unit

O : Applicable *1 : Communication cannot be established.

Sedan 2WD QG16DE (Electric throttle control)