DTC 22

Code 22 - Throttle Position Sensor Circuit (Voltage Low):

Wiring Diagram For Code 22 - Throttle Position Sensor:

CODE 22 - THROTTLE POSITION SENSOR (SIGNAL VOLTAGE LOW)



Circuit Description:

The throttle position sensor (TPS) provides a voltage signal that changes relative to the throttle valve. Signal voltage will vary from less than 1.25 volts at idle to about 4.5 volts at wide open throttle (WOT).

The TPS signal is one of the most important inputs used by the ECM for fuel control and for many of the ECM controlled outputs.

Code 22 will set if all the conditions below are met:

^ TPS signal voltage is less than .2 volts for 5 seconds and engine speed less than 1200 RPM. Possible causes of Code 22:
^ Faulty TPS.
^ Faulty wiring or terminals.
^ Faulty ECM.


Test Description:

1. Confirms Code 22, and that fault is still present.

2. Simulates Code 21: If the ECM recognizes the high signal voltage and sets Code 21, the ECM and wiring are OK.


3. Checks for reference voltage from the ECM. To prevent damage to ECM, be sure to disconnect C-D connector when checking circuit wiring for open or shorts to ground.