Circuit Description
The transmission control module (TCM) provides voltage to the torque converter clutch pulse width modulated (TCC PWM) solenoid valve through High Side Driver 2 (HSD2). The TCM controls the ON and OFF time of the solenoid by providing a ground through the output driver module (ODM) . The TCM uses a PWM duty cycle, in order to control application and release of the TCC. When the solenoid is commanded OFF, the TCM senses high voltage. When the solenoid is commanded ON, the TCM senses low voltage.
When the TCM detects a short to voltage in the TCC PWM Solenoid valve circuit, then DTC P2763 sets. DTC P2763 is a type B DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P2763 Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit High Voltage
Conditions for Running the DTC
| • | The engine run time is greater than 5 seconds. |
| • | HSD2 is commanded ON. |
Conditions for Setting the DTC
DTC P2763 sets when the TCM detects an short to voltage in the TCC PWM solenoid valve circuit when the PWM duty cycle is 45 percent or greater for 4.3 seconds.
Action Taken When the DTC Sets
| • | The TCM requests the ECM to illuminate the malfunction indicator lamp (MIL) during the second consecutive drive trip in which the Conditions for Setting the DTC are met. |
| • | The TCM inhibits fifth gear if the transmission is in Hot Mode. |
| • | The TCM inhibits the TCC. |
| • | The TCM freezes transmission adaptive functions. |
| • | 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 P2763 in TCM history. |
Conditions for Clearing the MIL/DTC
| • | The ECM turns OFF the MIL after the sixth consecutive drive trip in which the TCM does not send a MIL illumination request. |
| • | A scan tool can clear the MIL/DTC. |
| • | The TCM clears the DTC from TCM history if the vehicle completes 40 warm-up cycles without an emission related diagnostic fault occurring. |
| • | The TCM cancels the default actions when the ignition is OFF long enough in order to power down the TCM. |
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||
Important:
Does the solenoid operate? | -- | Go to Step 8 | Go to Step 3 | |||||
3 |
Does the test lamp illuminate? | -- | Go to Step 4 | Go to Step 6 | ||||
4 |
Refer to Component Resistance . Is the resistance within the specified range? | 10.0-13.6 ohms | Go to Step 5 | Go to Step 7 | ||||
5 |
Did you find a condition? | -- | Go to Step 9 | Go to Step 8 | ||||
6 |
Did you find a condition? | -- | Go to Step 9 | Go to Step 8 | ||||
7 |
Did you find a condition? | -- | Go to Step 10 | Go to Step 11 | ||||
8 | Replace the TCM. Refer to Control Module References for replacement, setup and programming. Is the action complete? | -- | Go to Step 12 | -- | ||||
9 | Perform the necessary wiring repairs. Refer to Wiring Repairs . Is the action complete? | -- | Go to Step 12 | -- | ||||
10 | Replace the AT internal transmission wiring harness. Refer to Transmission Internal Electrical Harness Replacement . Is the action complete? | -- | Go to Step 12 | -- | ||||
11 | Replace the TCC PWM solenoid valve. Refer to Torque Converter Clutch Solenoid Replacement . Is the action complete? | -- | Go to Step 12 | -- | ||||
12 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 13 | Go to Step 2 | ||||
13 | With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed? | -- | System OK |
