Technician A says that MAP sensors use a 5-volt reference voltage from the PCM. Technician B says that the MAP sensor voltage will be higher at idle at high altitudes compared to when the engine is operating at near sea level. Which technician is correct?

Technician A only

Technician B only

Both Technicians A and B

Neither Technician A nor B

Both Technicians A and B

Explanation:

MAP sensors are nothing but Manifold absolute pressure sensor used in IC engines electronic control system. It detects an engine load and gives signals.

For MAP sensor both statements that is

1. MAP sensors use a 5-volt reference voltage from the PCM.

2. The MAP sensor voltage will be higher at idle at high altitudes compared to when the engine is operating at near sea level.

Are correct.

Hence Both the Technician are correct.