Advanced Engine Performance Specialist Free Sample Questions

General Powertrain Diagnosis · A.7 Differentiate between powertrain mechanical and electrical/electronic problems, including variable valve timing (VVT) and variable valve lift (VVL) systems.

1. A

   Open ground circuit between the VVL motor and chassis ground

2. B

   Failed camshaft position actuator oil control solenoid valve

3. C

   Mechanical binding in the rocker arm fulcrum shaft mechanism

4. D

   Blown VVL motor high-current supply fuse in the underhood junction block

General Powertrain Diagnosis · A.7 Differentiate between powertrain mechanical and electrical/electronic problems, including variable valve timing (VVT) and variable valve lift (VVL) systems.

1. A

   Low engine oil pressure preventing hydraulic pressure from overcoming phaser friction

2. B

   Mechanically jammed VVT oil control spool valve or contaminated hydraulic passage holding oil pressure in the advance chamber

3. C

   Short-to-ground in the ECM internal low-side driver circuit controlling the Bank 1 solenoid

4. D

   Broken camshaft phaser return spring holding the camshaft in the maximum retarded rest position

General Powertrain Diagnosis · A.7 Differentiate between powertrain mechanical and electrical/electronic problems, including variable valve timing (VVT) and variable valve lift (VVL) systems.

1. A

   True

2. B

   False

Computerized Powertrain Controls Diagnosis (including OBD II) · B.7 Research OBD II system operation to determine the enable criteria for setting and clearing diagnostic trouble codes (DTCs) (including permanent DTCs) and malfunction indicator lamp (MIL) operation

1. A

   The fault must be detected during wide-open throttle acceleration on two non-consecutive drive cycles

2. B

   The vehicle must be operated for at least 40 consecutive minutes at a steady vehicle speed above 55 mph

3. C

   The engine must complete three consecutive key cycles with coolant temperature rising above 200° F (93° C)

4. D

   The fault must recur on the next consecutive trip within 375 rpm, 20% engine load, and matching warm-up state

Computerized Powertrain Controls Diagnosis (including OBD II) · B.7 Research OBD II system operation to determine the enable criteria for setting and clearing diagnostic trouble codes (DTCs) (including permanent DTCs) and malfunction indicator lamp (MIL) operation

1. A

   Coolant temperature must rise by at least 40° F (22° C) and reach a minimum temperature of 160° F (71° C)

2. B

   Coolant temperature must rise from below 32° F (0° C) to the thermostat rating of 195° F (91° C)

3. C

   The engine must operate in closed-loop fuel control for at least 15 continuous minutes without stopping

4. D

   Intake air temperature and engine oil temperature must both exceed 180° F (82° C) during vehicle operation

Computerized Powertrain Controls Diagnosis (including OBD II) · B.8 Interpret OBD II scan tool data stream, diagnostic trouble codes (DTCs), freeze frame data, system monitors, monitor readiness indicators, and trip and drive cycle information to determine system

1. A

   The ECM erases all freeze frame data immediately until both faults occur concurrently on the same driving trip

2. B

   The ECM automatically stores both freeze frames simultaneously in dedicated non-volatile partitions

3. C

   The P0303 misfire freeze frame data will overwrite and replace the previously stored P0442 EVAP freeze frame data

4. D

   The P0442 freeze frame data is retained, and freeze frame capture for the P0303 misfire is permanently locked out