P0882-Tcm Power Input Low

P0882-TCM POWER INPUT LOW

Special Tools:Click to display a list of tools used in this procedure

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

Theory of Operation

The Transmission Control Output circuit is used to supply power to the Transmission Solenoid/TRS Assembly and to the PCM when in normal operating mode. The purpose of the Transmission Output circuit is to allow the Transmission Control System 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 the engine) the Transmission Control System verifies that the Transmission Output circuit is open by checking for voltage on the Transmission Output circuits before the Transmission Control System requests for the circuit to be powered up. The request is sent by a direct circuit control from the PCM to the TIPM. If the Transmission Control System detects less that 3.0 volts when the output is commanded on, the DTC will set.Note: Inadequate Transmission Control Output voltage can also cause DTCs P0846, P0869, or P0871 to set. Repairing the P0882 fault should also eliminate the related DTCs.

· 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 when there is less than 3.0 volts present at the transmission control output circuits located in the Powertrain Control Module (PCM) when the Transmission Control System request the power up of those circuits.

Possible Causes

/
RELATED TIPM DTCS
TRANSMISSION CONTROL RELAY
(T15) TRANSMISSION CONTROL CIRCUIT SHORT TO GROUND
(T15) TRANSMISSION CONTROL CIRCUIT OPEN
POWERTRAIN CONTROL MODULE

1.CHECK IF THE DTC P0882 IS CURRENT

1. / With the scan tool, Check the Starts Since Set counter for P0882.
NOTE: / This counter only applies to the last DTC set.

Is the Starts Since Set counter equal to 0?
Yes

· Go To2

· Go To6

2.CHECK FOR TIPM RELATED DTCS

1. / With the scan tool, check TIPM DTCs.

Are there any TIPM TCM Power Control circuit DTCs present?
Yes

· Refer to DTC Based Diagnostics and perform the appropriate diagnostic procedure.

· Go To3

3.TRANSMISSION CONTROL RELAY

1. / Turn the ignition off to the lock position.
NOTE: / Due to different power control configurations, the Transmission Control Relay may be referred to as a PCM relay.
2. / Remove the Transmission Control Relay.
NOTE: / Check connectors - Clean/repair as necessary.
3. / Install a substitute Relay in place of the Transmission Control Relay.
4. / Ignition on, engine not running.
5. / With the scan tool, monitor the Switched Battery voltage in the next step.
NOTE: / The switched battery voltage should remain steady and around 12-volts

Does the Switched Battery voltage remain a steady voltage (12-volts) and the DTC not reset?
Yes

· Replace the Transmission Control Relay.

· Go To4

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

1. / Turn the ignition off to the lock position.
2. / Disconnect the PCM C4 harness connector and connect Miller tool #8815A.
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 theKit, NGC, 38 Position 8815Ato perform diagnosis.
3. / Disconnect the TIPM C1 harness connector.
4. / Measure the resistance between ground and the (T15) Transmission Control circuit.

Is the resistance below 5.0 ohms?
Yes

· Repair the (T15) Transmission Control circuit for a short to ground

· Go To5

5.CHECK THE (T15) TRANSMISSION CONTROL CIRCUIT FOR AN OPEN

1. / Measure the resistance of the (T15) Transmission Control circuit between the TIPM C1 harness connector and the appropriate terminal of Miller tool #8815A.

Is the resistance above 5.0 ohms?
Yes

· Repair the (T15) Transmission Control circuit for an open.

· 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 in accordance with the Service Information. With the scan tool, perform Quick Learn.

6.CHECK THE 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.

· Test Complete.