Circuit Description
The ignition voltage is provided to the torque converter clutch pulse width modulated (TCC PWM) solenoid valve. The transmission control module (TCM) controls the ON and OFF time of the TCC PWM solenoid by controlling the ground side of the TCC solenoid valve control circuit. 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 Solenoid valve control 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. |
| • | TCC is commanded ON. |
Conditions for Setting the DTC
DTC P2763 sets when the TCM detects a short to voltage in the TCC PWM solenoid valve circuit.
Action Taken When the DTC Sets
| • | The TCM requests the engine control module (ECM) to illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met. |
| • | The TCM commands maximum line pressure. |
| • | The TCM forces TCC OFF. |
| • | The TCM inhibits TCC solenoid. |
| • | The TCM inhibits fourth gear if the transmission is in Hot Mode. |
| • | The TCM freezes transmission adaptive function. |
| • | The ECM records the operating conditions when the Conditions for Setting the DTC are met. The ECM stores this information as Freeze Frame and Failure Records and the TCM records the operating conditions when the Conditions for Setting the DTC are met. The TCM stores this information as Failure Records. |
| • | The TCM stores DTC P2763 in TCM history. |
Conditions for Clearing the MIL/DTC
| • | The ECM turns OFF the MIL after the third consecutive drive trip in which the TCM does not send a MIL illumination request. |
| • | The TCM clears the DIC message when the condition no longer exists. |
| • | 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.
-
This step tests the TCM and the wiring to the transmission.
-
This step verifies that the circuit has the correct resistance.
Step | Action | Values | Yes | No | ||||
|---|---|---|---|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||
2 |
Important: Before clearing the DTC, use the scan tool in order to record the TCM Freeze Frame and the Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the TCM. When TCC is commanded, does the scan tool display indicate a short to voltage? | -- | Go to Step 3 | Go to Testing for Intermittent Conditions and Poor Connections | ||||
Refer to Automatic Transmission Inline 20-Way Connector End View . Is the test lamp ON? | -- | Go to Step 4 | Go to Step 5 | |||||
4 | Test the control circuit of the TCC PWM solenoid valve for a short to voltage between the TCM connector and the AT inline 20-way connector. Refer to Testing for a Short to Voltage and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 11 | Go to Step 10 | ||||
Refer to Automatic Transmission Inline 20-Way Connector End View . Does the resistance measure within the specified range? | 10-25 ohms | Go to Step 7 | Go to Step 6 | |||||
6 |
Does the resistance measure less than the specified value? | 250 K ohms | Go to Step 8 | Go to Step 9 | ||||
7 | Measure the resistance between terminal T and all other terminals, except terminal U, of the J 44152 . Refer to Automatic Transmission Inline 20-Way Connector End View . Is the resistance between terminal T and any other terminal, except terminal U, less than the specified value? | 250 K ohms | Go to Step 8 | Go to Testing for Intermittent Conditions and Poor Connections | ||||
8 |
Important: The automatic transmission wiring harness consists of 2 separate harnesses, the Automatic Transmission Wiring Harness Assembly and the Automatic Transmission Wiring Extension Harness Assembly. In order to avoid the unnecessary replacement of parts, determine which harness contains the fault and replace only that harness. Replace the automatic transmission wiring harness. Refer to Input Speed Sensor and Wiring Harness Removal . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||
9 | Replace the TCC PWM solenoid valve. Refer to Control Valve Upper Body Disassemble . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||
10 | Replace the TCM. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 11 | -- | ||||
11 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | Go to Step 12 | Go to Step 2 | ||||
12 | 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 |
