With TBI

Fig. 093 Chart - Code 22 Throttle Position Sensor:

Fig. 094 - Wiring Diagram for Code 22 Throttle Position Sensor. VIN 0, VIN 2, VIN R, VIN U:

CODE 22,

TPS (SIGNAL VOLTAGE LOW)

1.8L "J" SERIES,

2.5L "A, X, & N" SERIES
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, and is non-adjustable.
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:
a. Engine is running
b. TPS signal voltage is less than .2 volts for 2 seconds
c. Engine speed less than 1600 RPM. This is the purpose for placing shift lever in drive.

Possible causes of Code 22:
a. Faulty TPS
b. Faulty wiring or terminals
c. Faulty ECM.
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 ECM connector when checking circuit wiring for open or shorts to ground.