P2757
DTC P2757 or P2759
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 P2757
- Torque Converter Clutch Pressure Control Solenoid Performance (Shift Solenoid Valve SLU)
DTC P2759
- Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve SLU)
Diagnostic Fault Information
Circuit/System Description
The powertrain control module (PCM) provides a B+ control circuit to the shift solenoid valve SLU. The ground circuit for the shift solenoid SLU is provided through the body of the solenoid. The torque converter clutch (TCC) is controlled by the PCM based on both speed sensors, engine RPM, engine load, engine temperature, vehicle speed, transmission temperature, and gear selection. When conditions are appropriate, the PCM request TCC by applying B+ to the shift solenoid valve SLU. When the shift solenoid valve SLU is turned on, it applies transmission oil pressure to the lock-up relay valve and locks the TCC.
Conditions for Running the DTC
P2757 or P2759
The engine is running.
Conditions for Setting the DTC
P2757
The gear position commanded by the PCM and the actual gear position are not the same.
P2759
The PCM detects a short to ground or an open/high resistance on the B+ or control circuit of the shift solenoid valve SLU.
Action Taken When the DTC Sets
DTC P2757 and P2759 are type A DTCs.
Conditions for Clearing the DTC
DTC P2757 and P2759 are type A DTCs.
Diagnostic Aids
* The battery must be fully charged. Refer to Battery Inspection/Test (Battery Inspection/Test).
* All resistance tests are conducted with the component at 20°C (68°F).
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Mechanical Component Description (Mechanical 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
Powertrain Control Module Scan Tool Information (Scan Tool Testing and Procedures) for scan tool information
Circuit/System Verification
Note: If any other DTCs are set, diagnosis them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
1. Operate the vehicle at less than 48 km/h (30 mph) with a steady throttle input.
2. Command the TCC ON, with a scan tool, while observing the engine RPM. Lightly depress the accelerator pedal. The engine speed should not abruptly change.
3. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: For DTC P2759 only.
1. Ignition OFF, disconnect the transmission harness connector.
2. Test for 5-6 ohm between the transmission component connector terminal 4 and terminal 9.
• If not within the specified value, test the transmission internal wire harness for an open/high resistance. If the circuit tests normal, replace the shift solenoid valve SLU.
3. Test for greater than 10K ohm between the transmission component connector terminal 4 and ground and also terminal 9 and ground.
• If less than the specified value, test the transmission internal wire harness for a short to ground. If the circuit tests normal, replace the shift solenoid valve.
4. Ignition OFF, connect the transmission harness connector.
5. Disconnect the PCM X2 harness connector.
6. Test for 5-6 ohm between the PCM X2 harness connector terminal 57 and terminal 77.
• If not within the specified value, test the shift solenoid valve, SLU, voltage circuit and the control circuit for an open/high resistance.
7. Test for greater than 10K ohm between the PCM X2 harness connector terminal 57 and ground.
• If less than the specified value, test the voltage circuit for a short to ground.
8. Test for greater than 10K ohm between the PCM X2 harness connector terminal 77 and ground.
• If less than the specified value, test the control circuit for a short to ground.
9. If all circuits test normal, replace the PCM.
Component Testing
Note: For DTC P2757 only.
1. Ignition OFF, remove the shift solenoid valve SLU.
2. Test for 5-6 ohm between terminals 1 and 2 of the solenoid valve SLU.
• If not within the specified value, replace the shift solenoid valve SLU.
3. Connect a 10 A fused jumper wire to terminal 1 and a non-fused jumper wire to terminal 2 of the shift solenoid valve SLU.
4. Momentary connect the other ends of the jumper wires to a 12 V battery. The solenoid should energize and make a click sound.
• If the solenoid does not energize and click, replace the shift solenoid valve SLU.
5. If all circuits test normal, refer to Symptoms - Automatic Transmission (Symptoms - Automatic Transmission).
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.
* Control Valve Body Replacement (MVB 4 Speed - Automatic Transmission)
* Powertrain Control Module Replacement (Service and Repair)
* Powertrain Control Module Programming and Setup (Testing and Inspection)