DTC 34

Fig. 049 - WIRING DIAGRAM for Code 34 MAP Sensor (Signal Voltage Low). VIN J:

CODE 34

MAP SENSOR (SIGNAL VOLTAGE LOW)

1.8L TURBO "J" SERIES

FUEL INJECTION (PORT)

The Manifold Absolute Pressure Sensor (MAP) responds to changes in manifold pressure (vacuum). The ECM recieves this information as a signal voltage that will vary from about 1 to 1.5 volts at idle to 4-4.5 at wide open throttle.
If the MAP sensor fails the ECM will substitute a fixed MAP value and use the Throttle Position Sensor (TPS) to control fuel delivery.
Code 34 will set when signal is to low and ignition is turned on.
Possible causes of a Code 34 are:
a. Faulty MAP sensor
b. Faulty wiring or terminals
c. A faulty ECM

Fig. 048 - Chart - Code 34 MAP Sensor (Signal Voltage Low):

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.
3. If CKT 432 is shorted to ground check turbo boost gage circuit.