DTC P2770 V6
DTC Description
This diagnostic procedure supports DTC P2770 Torque Converter Clutch (TCC) Enable Solenoid Control Circuit High Voltage.
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 ignition voltage 1 circuit (circuit 339). The transmission control module (TCM) monitors the throttle position (TP) voltage, the vehicle speed and other inputs in order to determine when to energize the TCC solenoid valve.
Important: The TCC solenoid valve is part of the control valve body wiring harness. To replace the solenoid valve, the control valve body harness must be replaced.
When the TCM detects a continuous short to voltage in the TCC solenoid valve control circuit, then DTC P2770 sets. DTC P2770 is a type B DTC.
Refer to Automatic Transmission Controls Schematics , Automatic Transmission Inline 20-Way Connector End View, Automatic Transmission Internal Connector End Views , Automatic Transmission Control Module Connector End Views , and Automatic Transmission Related Connector End Views to aid in diagnosis.
Conditions for Running the DTC
| • | The system voltage is 8-18 V. |
| • | The engine speed is 500 RPM for 5 seconds. |
Conditions for Setting the DTC
DTC P2770 sets if the TCM commands the solenoid on and the voltage feedback remains high, battery voltage.
Action Taken When the DTC Sets
| • | The TCM requests the ECM to illuminate the check powertrain icon during the second consecutive trip in which the conditions for setting the DTC are met. |
| • | The TCM commands maximum line pressure. |
| • | The TCM freezes transmission adaptive functions. |
| • | The TCM inhibits TCC engagement. |
| • | At the time of the first failure, the TCM records the operating conditions when the conditions for setting the DTC are met. The TCM 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 TCM stores DTC P2770 in TCM history during the second consecutive trip in which the conditions for setting the DTC are met. |
Conditions for Clearing the DTC
| • | The ECM turns off the check powertrain icon after the fourth consecutive drive trip in which the TCM does not send a check powertrain icon illumination request. |
| • | Tech 2 can clear the DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without a non-emission related diagnostic fault occurring. |
| • | The TCM cancels the DTC default actions when the ignition is off long enough in order to power down the TCM. |
Test Description
The following numbers refer to the step numbers in the diagnostic table:
2 Checks for a short to voltage in the TCC solenoid valve signal circuit. Isolates whether the TCM or the TCC solenoid valve and control valve body wiring harness are at fault.
Step | Action | Yes | No |
|---|---|---|---|
1 | Has the Diagnostic System Check been performed? | Go to Step 2 | |
2 |
Important: Additional DTCs may set Does the test lamp illuminate? | Go to Step 3 | Replace the internal wiring harness and TCC solenoid valve, refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness Go to Step 5 |
3 | Using a multimeter, test circuit 422 for a short to voltage. Did you find and correct the condition? | Go to Step 5 | Go to Step 4 |
4 | Replace the TCM, refer to Transmission Control Module Replacement. Did you complete the replacement? | Go to Step 5 | -- |
5 | Perform the following procedure in order to verify the repair:
Diagnostic Trouble Codes / Clear Engine and Transmission DTCs Diagnostic Trouble Codes / Read DTC Information. Has DTC P2770 set? | Go to Step 2 | Go To Step 6 |
6 | On Tech 2 select: Diagnostic Trouble Codes / Read DTC Information Does Tech 2 display any DTCs you have not diagnosed? | Refer to Scan Tool Data List | System OK |
When all diagnosis and repairs are completed, check the system for correct operation. | |||
