P2761
DTC P2761-P2764
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P2761
-
Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit
DTC P2762
-
Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid System Performance
DTC P2763
-
Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit High Voltage
DTC P2764
-
Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage
Diagnostic Fault Information
Circuit/System Description
The torque converter clutch (TCC) pressure control solenoid controls pressure which is proportional to the current. The transmission fluid pressure from the TCC pressure control solenoid is directed to another valve which regulates the transmission fluid flow and pressure through the torque converter clutch valve to control the rate of TCC apply and release.
The transmission control module (TCM) provides B+ to the TCC solenoid, pressure control solenoid 1 (PCS1), and the modulated main pressure control (PC) solenoid valve through a separate solid state device called high side driver 1 (HSD1). The TCM uses a low side driver to control the current flow to the TCC pressure control solenoid. The TCM controls the current to the solenoid by changing the amount of time that the low side driver is on.
Conditions for Running the DTC
P2761, P2763, or P2764
* DTC P0657, P0658, or P0659 is not set.
* Battery voltage is between 9-18 V.
* HSD1 is enabled.
* Engine speed is greater than 200 RPM.
P2762
* DTC P0657, P0658, P0659, P2761, P2762, or P2764 is not set.
* Battery voltage is between 9-18 V.
* HSD1 is enabled.
* Engine speed is greater than 200 RPM.
Conditions for Setting the DTC
P2761
TCM detects an open circuit on the TCC pressure control solenoid control circuit for 3 seconds.
P2762
TCM detects the TCC pressure control solenoid current does not equal the commanded TCC pressure control solenoid current for 3 seconds.
P2763
TCM detects a short to voltage on the TCC pressure control solenoid control circuit for 1 second.
P2764
TCM detects a short to ground on the TCC pressure control solenoid control circuit for 3 seconds.
Action Taken When the DTC Sets
P2761, P2762, and P2763
* DTCs P2761, P2762, and P2763 are Type B DTCs.
* TCM inhibits TCC.
P2764
* DTC P2764 is a Type B DTC.
* TCM inhibits reverse.
Conditions for Clearing the DTC
DTCs P2761, P2762, P2763, and P2764 are Type B DTCs.
Diagnostic Aids
P2761
* You may have to drive the vehicle in order to experience a condition.
* If DTC P2761 is accompanied by DTC P0960 and/or DTC P2727 the open is most likely in the HSD1 circuit.
P2763 and P2764
You may have to drive the vehicle in order to experience a condition.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
* Inline Harness Connector End Views X100
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. If DTC P0657, P0658, or P0659 was set, diagnose those DTCs first.
2. Ignition ON, engine OFF, command the TCC Control Solenoid ON and OFF with a scan tool. Observe the scan tool TCC PC Sol. Pressure Command parameter. The TCC PC Sol. Pressure Command parameter should change from 0 kPa (0 psi) to 1,600 kPa (232 psi).
• If the parameter does not change between the specified values
Refer to Circuit/System Testing below.
• If the parameter changes between the specified values
3. Clear the TCM DTCs.
4. Perform the Road Test Initial Inspection and Diagnostic Overview. Verify with a scan tool that DTC P2761, P2762, P2763, or P2764 did not set.
• If DTC P2761, P2762, P2763, or P2764 set
Refer to Circuit/System Testing below.
• If DTC P2761, P2762, P2763, or P2764 did not set
5. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
Note:
You must perform the Circuit/System Verification first.
1. Ignition OFF, disconnect the 20-way X175 vehicle harness connector at the transmission.
2. Ignition ON, engine OFF.
3. Verify that a test lamp illuminates between the vehicle harness X175 transmission connector B+ circuit terminal L and ground.
• If the test lamp does not illuminate
1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
2. Test for infinite resistance between the X175 vehicle harness transmission connector B+ circuit terminal L and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. Test for less than 2 ohms between the X175 vehicle harness transmission connector B+ circuit terminal L and the vehicle harness transmission control module connector terminal 11.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K71 transmission control module.
• If the test lamp illuminates
4. Connect a test lamp between the X175 vehicle harness transmission connector torque converter clutch (TCC) pressure control (PC) solenoid valve control circuit terminal J and the B+ circuit terminal L.
5. Command the TCC Control Solenoid ON and OFF with a scan tool. Verify the TCC PC Sol. Pressure Command parameter changes from 0 kPa (0 psi) to 1,600 kPa (232 psi). The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON
1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
2. Test for infinite resistance between the X175 vehicle harness transmission connector torque converter clutch (TCC) pressure control (PC) solenoid valve control circuit terminal J and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the K71 transmission control module.
• If the test lamp is always OFF
1. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
2. Test for less than 2 ohms between the X175 vehicle harness transmission connector torque converter clutch (TCC) pressure control (PC) solenoid valve control circuit terminal J and the vehicle harness transmission control module connector terminal 78.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms
3. Ignition ON.
4. Test for less than 1 volt between the X175 vehicle harness transmission connector torque converter clutch (TCC) pressure control (PC) solenoid valve control circuit terminal J and ground.
• If 1 volt or greater, repair the short to voltage in the circuit.
• If less than 1 volt, replace the K71 transmission control module.
• If test lamp turns ON and OFF
6. Ignition OFF, install the X175 vehicle harness connector at the transmission.
7. Remove the transmission oil pan. Refer to Oil Pan Replacement Service and Repair.
8. Disconnect the torque converter clutch (TCC) pressure control (PC) solenoid valve connector.
9. Connect a test lamp between the transmission internal harness torque converter clutch (TCC) pressure control (PC) solenoid valve connector B+ circuit terminal 1 and control circuit terminal 2.
10. Ignition ON, engine OFF.
11. Command the TCC Control Solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp does not turn ON and OFF
Replace the transmission internal wiring harness. Refer to Wiring Harness Replacement Service and Repair.
• If the test lamp turns ON and OFF
12. Ignition OFF, disconnect the 80 way vehicle harness connector at the K71 transmission control module.
13. Test for infinite resistance between the transmission internal harness torque converter clutch (TCC) pressure control (PC) solenoid valve connector control circuit terminal 2 and ground.
• If less than infinite resistance
Repair the short to ground on the circuit.
• If infinite resistance
14. Test for less than 2 ohms between transmission internal harness torque converter clutch (TCC) pressure control (PC) solenoid valve connector control circuit terminal 2 and the vehicle harness transmission control module connector terminal 78.
• If 2 ohms or greater
Repair the open/high resistance in the circuit.
• If less than 2 ohms
15. Replace the torque converter clutch (TCC) pressure control (PC) solenoid valve.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Wiring Harness Replacement Service and Repair
* Control Valve Solenoid Replacement (PCS1 and PCS2) Control Valve Solenoid Replacement (PCS1 and PCS2)Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD)
* Control Module References Control Module References for TCM replacement, programming, and setup
Repair Verification
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.