Powertrain Control Module (PCM) - 545RFE

P0883-TCM POWER INPUT HIGH

Special Tools:










For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Transmission Control Relay is used to supply power (Transmission Control Output) to the Transmission Solenoid/TRS Assembly when in normal operating mode and to pins C4-19, C4-28 and C4-38 of the PCM. The purpose of the Transmission Control Relay is to allow the Powertrain Control Module (PCM) to turn off the power to the Transmission Solenoid/TRS Assembly in event that the transmission should need to be placed into "limp-in" mode due to a DTC.

After a PCM reset, (ignition switch turned to the run position, or after cranking engine) the PCM verifies that the Transmission Control Relay contacts are open by checking for voltage on the Transmission Control Relay Output circuit before the Transmission Control Relay is energized. If voltage is detected, the DTC will set.

- When Monitored:
When the ignition is turned from "OFF" position to "RUN" position and/or the ignition is turned from "START" position to "RUN" position.

- Set Condition:
This DTC is set if the Powertrain Control Module (PCM) senses greater than 3.0 volts on the Transmission Control Relay Output circuits prior to a request from the PCM to energize the Transmission Control Relay.





Always perform the Pre-Diagnostic Troubleshooting Procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. CHECK IF THE DTC IS CURRENT
1. With the scan tool, read DTCs.

Is the status Active or is the Starts Since Set counter 0 for this DTC?

Yes

- Go To 2

No

- Go To 5

2. CHECK THE TRANSMISSION CONTROL RELAY
1. Turn the ignition off to the lock position.
2. Disconnect the Transmission Control Relay.
3. Install a substitute relay.
4. Ignition on, engine not running.
5. With the scan tool, read DTCs.

Is the status Active or is the Starts Since Set counter 0 for this DTC?

Yes

- Go To 3

No

- Replace the Transmission Control Relay.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. 545RFE Transmission Verification Test

3. CHECK THE (T16) TRANSMISSION CONTROL OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE




1. Remove the Transmission Control Relay.
2. Ignition on, engine not running.
3. Measure the voltage at the (T16) Transmission Control Output circuit in the Transmission Control Relay connector.

Is the voltage above 0.5 of a volt?

Yes

- Repair the (T16) Transmission Control Output circuit for a short to voltage.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. 545RFE Transmission Verification Test

No

- Go To 4

4. CHECK THE (T15) TRANSMISSION CONTROL CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition off to the lock position.
2. Disconnect the PCM C4 harness connector and connect the PCM Pinout Box.

CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install the (8815A) to perform diagnosis.

3. Disconnect the Transmission Solenoid/TRS Assembly harness connector.
4. Disconnect the TIPM C1 harness connector.
5. Ignition on, engine not running.
6. Measure the voltage of the (T15) Transmission Control circuit.

Is the voltage above 0.5 of a volt?

Yes

- Repair the (T15) Transmission Control circuit for a short to voltage.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. 545RFE Transmission Verification Test

No

- Using the schematics as a guide, check the Powertrain Control Module (PCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the PCM. With the scan tool, perform Quick Learn.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. 545RFE Transmission Verification Test

5. CHECK WIRING AND CONNECTORS
1. The conditions necessary to set this DTC are not present at this time.
2. Using the schematics as a guide, inspect the wiring and connectors specific to this circuit.
3. Wiggle the wires while checking for shorted and open circuits.
4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.

Where there any problems found?

Yes

- Repair as necessary.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. 545RFE Transmission Verification Test

No

- Test Complete.