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DTC P0961-P0963

DTC P0961-P0963

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P0961

Line Pressure Control Solenoid Valve Performance

DTC P0962

Line Pressure Control Solenoid Valve Control Circuit Low Voltage

DTC P0963

Line Pressure Control Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Line PC Solenoid Control P0962 P0963 P0963 P0961


Typical Scan Tool Data

Line Pressure Control Solenoid Valve Performance Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Operating conditions: Ignition ON Parameter Normal Range: OK
Line PC Solenoid Control - - - Fault or Malfunction


Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Operating conditions: Ignition ON Parameter Normal Range: OK
Line PC Solenoid Control Fault or Malfunction - - -


Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Operating conditions: Ignition ON Parameter Normal Range: OK
Line PC Solenoid Control - Fault or Malfunction Fault or Malfunction -


Circuit/System Description

The line pressure control (PC) solenoid is part of the control solenoid valve assembly, which has no serviceable components. The normally high line PC solenoid regulates and directs the PC solenoid oil pressure to the pressure regulator valve and isolator valve. Increasing line PC solenoid pressure increases transmission line pressure. The transmission control module (TCM) varies the current to the line PC solenoid through a low side driver. Decreasing the current to the line PC solenoid increases line PC solenoid oil pressure by closing OFF the solenoid exhaust port. Increasing the current to the line PC solenoid decreases line PC oil pressure by opening the solenoid exhaust port. Line PC solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected the HSD will reset.

Conditions for Running the DTC


• The engine speed is 400 RPM or greater for 5.0 seconds.

• The ignition voltage is 8.6 volts or greater.


Conditions for Setting the DTC

P0961

The TCM detects an internal electrical malfunction of the line PC solenoid where the measured line PC solenoid current does not equal the commanded line PC solenoid current for 5.0 seconds.

P0962

The TCM detects a short to ground on the line PC solenoid control circuit for 2 seconds.

P0963

The TCM detects an open or a short to voltage on the line PC solenoid control circuit for 5 seconds.

Action Taken When the DTC Sets


P0961 or P0963

• DTCs P0961 and P0963 are Type B DTCs.

• The TCM freezes transmission adaptive functions.

• The TCM commands maximum line pressure.



P0962

• DTC P0962 is a Type A DTC.

• The TCM limits the transmission to Reverse and 5th gear operation.

• The TCM inhibits the torque converter clutch (TCC).

• The TCM commands maximum line pressure.

• The TCM freezes transmission adaptive functions.

• The TCM turns the HSD OFF.

• The TCM inhibits Tap Up/Down function.

• The TCM inhibits manual shifting of forward gears.

• The TCM enables torque management.


Conditions for Clearing the DIC/DTC


• DTCs P0961 and P0963 are Type B DTCs.

• DTC P0962 is a Type A DTC.


Reference Information

Connector End View Reference


• Component Connector End Views

• Inline Harness Connector End Views


Description and Operation

Transmission General Description

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-47825-20 Adapter Harness

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification


1. Engine running in Park position. Move the gear shift lever into each gear position and back into Park position. Verify with a scan tool the following test status parameters displays OK:

• Line Pressure Control Solenoid Valve Performance Test Status

• Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

• Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status

2. After you complete the steps described above, check the diagnostic trouble code is not reset by driving the vehicle according to the conditions for running diagnostic trouble codes (DTC). You can also drive the vehicle according to the conditions you see in Freeze Frame/ Failure records. If the vehicle passes the circuit/system verification procedure, then stop. Do not perform the circuit/system test or component test as this may result in unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections .


Circuit/System Testing


1.
Note

You must perform the Circuit/System Verification first.


Remove control solenoid valve assembly Q8 with ignition OFF. See Replacing control solenoid valve assembly and transmission control module .

2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.

4. Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.

5. Ignition ON, verify with a scan tool the following test status parameters display OK:

• Line Pressure Control Solenoid Valve Performance Test Status

• Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status

• Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status

• If any test status parameter displays Fault or Malfunction, replace the Q8 control solenoid valve assembly.


Repair Instructions

Note
• Perform the Resetting of the transmission's adaption after all transmission repairs.

• Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .


Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control solenoid valve assembly replacement, setup, and programming