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. Voltage between Connector B-40 Terminals C5 and C6 more than 4.9 volts. This detection occurs when the wiper is short to voltage (Engine can stall).
b. The condition needs to be present for at least 0.5 seconds. During the detection time the TCM reads "100% (Wide Open Throttle)".

- Action After The Detection Time:
- Backup Mode.

- Recovery Conditions:
- To recover when voltage is less or equal to 4.9 volts do an Ignition Cycle.





DTC 21 / Flow Chart