DTC 22

Code 22 - Throttle Position Sensor:

Wiring Diagram For Code 22 - Throttle Position Sensor Circuit (Signal Voltage Low):

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 at idle to about 4.5 volts at wide open throttle.

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

Code 22 will set if:

^ TPS signal is less than .2 volts for 2 seconds; and
^ Engine speed is less than 1600 RPM. This is the purpose for placing shift lever in drive.



Test Description:

1. Confirms Code 22 and that fault is 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 white connector when checking circuit wiring for open or shorts to ground.