Technician A says low engine vacuum will cause the MAP sensor to sense a load condition when it actually is not present, causing delayed and harsh shifts. Technician B says poor engine performance can cause delayed shifts through the action of the TP sensor indicating full throttle.
Who is correct?
A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question

​Technician A says low engine vacuum will cause the MAP sensor to sense a load condition when it actually is not present, causing delayed and harsh shifts. Technician B says poor engine performance can cause delayed shifts through the action of the TP sensor indicating full throttle.
Who is correct?
A)​A only
B)​B only
C)​Both A and B
D)​Neither A nor B

Quizplus · Accepted Answer

Both technicians are correct. Low engine vacuum can cause the MAP sensor to sense a load condition, which can cause delayed and harsh shifts. Poor engine performance can also cause delayed shifts if the TP sensor is indicating full throttle, even if it is not actually the case. Both factors can affect shift timing and quality.

​Technician a Says Low Engine Vacuum Will Cause the MAP

Technician a Says Low Engine Vacuum Will Cause the MAP