DTC 22

Fig. 027 - Wiring Diagram for Code 22 Throttle Position Sensor (Signal Voltage Low). VIN 3, VIN 9:

CODE 22, TPS (SIGNAL VOLTAGE LOW)

The Throttle Position Sensor (TPS) provides a voltage signal that changes relative to the throttle blade. Signal voltage will vary from about .5 at idle to 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 control outputs.
Code 22 will set if:
a. Engine running.
b. TPS signal voltage is less than .1 volt for 8 seconds.

Fig. 026 - Chart - Code 22 Throttle Position Sensor (Signal Voltage Low):

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 C-D connector when checking circuit wiring for open or shorts to ground.