P022

Code PO22:

Sensor Circuit:

DESCRIPTION:
The Throttle Position (TP) sensor is a potentiometer. A 5 volt reference is provided on CKT 474 and ground is provided on CKT 1076. The TP sensor signal circuit CKT 417 varies between ground and 5 volts based on the position of the throttle plates. At low throttle angle, the TP sensor signal voltage is low. The PCM uses TP sensor information to determine idle, WOT deceleration enleanment and acceleration enrichment. Code P022 sets when the PCM detects a TP sensor signal that is too low.

TEST CONDITIONS:
RPM 600 or greater.

FAILURE CONDITIONS:
TP of -5 degrees or less for 1 second.

ACTION TAKEN:
1. PCM turns 'ON' the 'SERVICE ENGINE SOON' MIL.

2. PCM disables the Torque Converter Clutch (TCC).

3. PCM sets TP sensor equal to 13 degrees when the Throttle Position Switch is open and 6 degrees when the Throttle Position Switch is closed.

4. PCM disables third and fourth gears.

NOTES ON FAULT TREE:
1. If Code P032 is also set, CKT 474 must be open or shorted to ground because TP sensor and MAP Sensor share the same 5 volt signal.

2. With TP sensor or wiring open, PCM data parameter PD01 will read -5 or less.

3. Checking for open TP sensor or open wiring. If the data value stays less than 80 with the TP sensor terminals A and 'C' jumpered together, the problem is in the wiring.

4. Voltage should be greater than 0.5 volt if CKT 474 is not open or shorted to ground.

5. Checking if CKT 474 is open or if CKT 474 is not open or shorted to ground.

6. Checking if signal is reaching PCM. If signal is reaching PCM, then the fault is with the PCM.