P2769
DTC P2769 (4.2L)
Circuit Description
The torque converter clutch (TCC) solenoid valve is an electrical device that is used with the torque converter clutch pulse width modulation (TCC PWM) solenoid valve in order to control TCC apply and release. The TCC solenoid valve attaches to the transmission case assembly extending into the pump cover. The TCC solenoid valve receives voltage through the ignition voltage circuit. The powertrain control module (PCM) controls the solenoid by providing the ground path on the TCC solenoid valve control circuit. The PCM monitors the throttle position (TP) voltage, the vehicle speed and other inputs in order to determine when to energize the TCC solenoid valve.
When the PCM detects a continuous open or short to ground in the TCC solenoid valve control circuit, then DTC P2769 sets. DTC P2769 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2769 Torque Converter Clutch (TCC) Enable Solenoid Control Circuit Low Voltage
Conditions for Running the DTC
- The system voltage is 8-18 volts.
- The engine speed is 475 RPM for 5 seconds.
Conditions for Setting the DTC
DTC P2769 sets when either of the following conditions occurs for 5 seconds:
- The PCM detects an open in the TCC solenoid valve circuit when the TCC is commanded ON.
- The PCM detects a short to ground in the TCC shift solenoid valve circuit when the TCC is commanded ON.
Action Taken When the DTC Sets
- The PCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.
- The PCM inhibits TCC engagement.
- The PCM inhibits 4th gear if in hot mode.
- The PCM freezes transmission adaptive functions.
- At the time of the first failure, the PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as a Failure Record.
- At the time of the second failure, the ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as a Freeze Frame.
- The PCM stores DTC P2769 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.
Conditions for Clearing the DTC
- The engine control module (ECM) turns OFF the MIL after the third consecutive drive trip in which the PCM does not send a MIL illumination request.
- A scan tool can clear the DTC.
- The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring.
- The PCM cancels the default actions when the ignition is OFF long enough in order to power down the PCM.
Diagnostic Aids
With the TCC engaged, the TCC slip speed should be -20 to +40 RPM.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
4. This step tests for voltage to the solenoid.
5. This step tests the ability of the PCM and wiring to control the ground circuit.
7. This step tests the resistance of the TCC solenoid valve and the automatic transmission (AT) wiring harness.
