Automatic Transmission - 2MT70
DTC P0969-P0971
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0969
- Pressure Control (PC) Solenoid 3 System Performance
DTC P0970
- Pressure Control (PC) Solenoid 3 Control Circuit Low Voltage
DTC P0971
- Pressure Control (PC) Solenoid 3 Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The clutch pressure control (PC) solenoid 3 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The transmission control module (TCM) supplies 12 volts to the clutch PC solenoid 3 on the high side driver 1 circuit. The TCM controls the PC solenoid 3 through the clutch PC solenoid 3 control circuit. The normally high clutch PC solenoid 3 controls fluid to the variable low and 1-2 reverse clutch or the 4th clutch assemblies when commanded ON and exhausts fluid when commanded OFF. The clutch PC solenoid 3 regulates the transmission fluid pressure to the variable low and 1-2 reverse clutch or the 4th clutch assemblies.
Conditions for Running the DTC
* The engine run time is greater than 5 seconds.
* The vehicle speed is less than 200 km/h (124 mph) for 5 seconds.
* The system voltage is 11-18V.
Conditions for Setting the DTC
P0969
The TCM detects an internal electrical performance malfunction of the clutch PC solenoid control circuit when the actual pressure does not equal the commanded pressure for 4 seconds in a 5 second sample.
P0970
The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid control circuit for 400 milliseconds in a 500 millisecond sample.
P0971
The TCM detects an internal high voltage electrical malfunction of the clutch PC solenoid control circuit for 400 milliseconds in a 500 millisecond sample.
Action Taken When the DTC Sets
* DTC P0969 is a Type B DTC.
* DTCs P0970 and P0971 are Type A DTCs.
* The TCM defaults the transmission to a limited shift pattern utilizing 2 forward gears and reverse based on the default detected.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
* DTC P0969 is a Type B DTC.
* DTCs P0970 and P0971 are Type A DTCs.
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Circuit/System Verification
Perform the following procedure to place the control solenoid (w/body and TCM) valve assembly under the optimal conditions to test solenoid electrical DTCs.
1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
2. Operate the vehicle long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature, then operate the vehicle in 4th gear for 5 seconds.
• If the DTC resets, go to Circuit/System Testing.
Circuit/System Testing
The scan tool data parameter Clutch PC 3 Sol. CKT Status normally displays OK.
If the parameter displays Open/Short to Volts, Short to GND, or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).
If no concerns are found, replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning) for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.