Technician A says that disconnecting the vehicle battery during diagnosis may erase the adaptive strategy from the PCM. Technician B says that a vacuum leak may be misdiagnosed as a fuel delivery problem. Who is correct?
A) A only
B) B only
C) both A and B
D) neither A nor B

Question

Quizplus · Accepted Answer

Both statements are correct. Disconnecting the vehicle battery can indeed erase the adaptive strategy from the Powertrain Control Module (PCM), which can affect the vehicle's performance until the PCM relearns the strategy. A vacuum leak can also affect the engine's air-fuel mixture, potentially leading to a misdiagnosis as a fuel delivery problem because both issues can cause similar symptoms such as rough idling or stalling.

Technician a Says That Disconnecting the Vehicle Battery During Diagnosis