DTC 34

Code 34 - MAP Sensor:

Wiring Diagram For Code 34 - MAP Sensor (Voltage Low):

CODE 34 - MAP SENSOR (SIGNAL VOLTAGE LOW)

Circuit Description:

The Manifold Absolute Pressure sensor (MAP) responds to changes in manifold pressure (vacuum). The ECM receives this information as a signal voltage that will vary from about 1 to 1-1/2 volts at idle to 4-4.5 volts at wide open throttle.

If the MAP sensor fails, the ECM will substitute a fixed MAP valve and use the Throttle Position Sensor (TPS) to control fuel delivery.

Code 34 will set when signal is too low and ignition is turned on.


Test Description:

1. Confirms Code 34, and that fault is present.

2. If the ECM recognizes and sets Code 33, high MAP signal, the ECM and wiring are OK.