94-95 Model

This Diagnostic Trouble Code (DTC) flashes the "CHECK TRANS" Indicator and sets the Backup Mode.




Circuit Description
- The Throttle Position Sensor (TPS) provides a voltage signal that changes relative to the Throttle Plate position. Signal voltage between Connector B-40 Terminals C5 and C6 will vary from about 0.4 at idle to about 4.6 volts at Wide Open Throttle.
- The Engine Control Module (ECM) also receives this signal. This TPS is a variable resistance with one side (Connector E-11 Terminal 2) connected only to the ECM Connector to have the 5.0 volts supply voltage. The other side (Connector E-11 Terminal 1) is connected to the Transmission Control Module (TCM) (floating ground) and the ECM (ground). The "middle" (the wiper) (Connector E-11 Terminal 3) is connected to the TCM and the ECM.
- The ECM monitors output voltage from the TPS and determines Fuel delivery based on Throttle Valve angle (driver demand).
- This TPS is an electrical component and must not be soaked in any liquid cleaner or solvent, as damage may result.

Diagnostic Aids
- This diagnostic is an electrical test done by the TCM.

- Detection Conditions:
a. This detects a TPS wiper short to TCM ground (except certain conditions) and wiper short to TPS low or open. This also detects a TPS low open.
b. Voltage between Connector B-40 Terminals C5 and C6 is less than 0.2 volts.
c. The condition needs to be present for at least 0.5 seconds. During the detection time the TCM reads "0% (idle)".

- Action After The Detection Time:
- Backup Mode.

- Recovery Conditions:
- To recover when voltage is more than or equal to 0.2 volts do an Ignition Cycle.





DTC 22 / Flow Chart