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20 MCQs on General Engine Diagnosis.
Typology: Exams
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Which of the following should be the first step in diagnosing an engine performance concern? a. Discussing concern with the vehicle owner b. Retrieve diagnostic trouble codes c. Check for symptoms in the online service manual d. Road test the vehicle
Using a diagnostic strategy for a drivability concern, which of the following is generally the last step in that process? a. Checking vehicle history b. Verifying repair c. Doing service checks d. Verifying concern
Technician A says paper service manuals are still used in today’s service world. Technician B says to follow the recommended service procedures contained in the online service information. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
When looking for specific service information, what vehicle information is needed to locate the information? a. Vehicle VIN b. Vehicle build date c. Model year d. Make, model and year
a. Adjusting electronic timing b. Adjusting ignition timing c. Checking ignition coil polarity d. Checking for spark with an ST
Technician A says an engine could misfire under load if the ignition coil is tracked. Technician B says the pickup coil must have dielectric grease under it. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
A 12 volt test light is connected from the negative primary coil terminal to ground on an electronic distributor ignition (DI) system. The light flutters while cranking the engine. A spark tester does not fire when it is connected from the coil secondary wire to ground while cranking the engine. Which of the following is the MOST likely cause? a. Defective engine coil b. Defective pickup coil c. Defective ignition module d. Defective spark plug
exhaust system could be the cause. Technician B says to always check for a restricted exhaust whenever replacing a failed EGR valve sensor. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
This question has the word EXCEPT. For this question, look for the choice that could NOT meet the described situation. Read the entire question carefully before choosing your answer. Long-term fuel trim is a Self-learned value. Disconnecting the MAF sensor or using a scan tool can clear a learned value. Many fuel system and emission components have a direct effect on the air/fuel mixture ratio. Self-learning Control should be cleared each time ay of these components have been replaced or repaired, EXCEPT: a. MAF (Mass Air Flow) sensor b. Oxygen sensor c. PCV (positive crankcase ventilation) valve d. Fuel injectors
The OBD II (On Board Diagnostic Level 2) system on a vehicle interprets a disconnected spark plug as a misfire that could damage the three way catalyst. On which trip will the ECM or PCM MOST likely turn on the Malfunction Indicator Lamp (MIL)? a. 1 st^ trip b. 2 nd^ trip c. 3 rd^ trip d. 4 th^ trip
Technician A says the on-board self-diagnostics test mode procedures should be conducted on a cold engine. Technician B says many diagnostic trouble codes (DTC) will monitor items only when the engine control system is in a closed loop. Who is right? a. A only b. B only c. Both A and B d. Neither A nor B
What component does the PCM or ECM monitor to determine the condition of the catalytic converter and will set a DTC (diagnostic trouble code) if it fails? a. Throttle position sensor b. Engine coolant temperature sensor c. Front and rear catalyst Temperature sensors d. Front and rear O2 (oxygen) sensors