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DTC P0973 or P0974

DTC P0973 or P0974

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 P0973

Shift Solenoid Valve 1 Control Circuit Low Voltage

DTC P0974

Shift Solenoid Valve 1 Control Circuit High Voltage

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Shift Solenoid 1 Control P0973 P0974 P0974 -


Typical Scan Tool Data

Shift Solenoid Valve 1 Control Circuit High Voltage Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage
Operating conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 1 Control - - Fault or Malfunction


Shift Solenoid Valve 1 Control Circuit Open Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage
Operating conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 1 Control - Fault or Malfunction -


Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status

Circuit Short to Ground Open/High Resistance Short to Voltage
Operating conditions: Ignition ON Parameter Normal Range: OK
Shift Solenoid 1 Control Fault or Malfunction - -


Circuit/System Description

The shift solenoid (SS) 1 is part of the control solenoid valve assembly, which has no serviceable components. SS 1 is a normally closed (NC) ON/OFF solenoid and is controlled by the transmission control module (TCM) through a low side driver. When the SS 1 is energized (ON), SS 1 fluid pressure is directed to the clutch select valve 2, which allows the valve to overcome the spring pressure and move to the applied position. The current to SS 1 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


P0973

• The engine speed is 400 RPM or greater for 5 seconds.

• The ignition voltage is 8.6 volts or greater.

• DTC P0973 is not set.



P0974

• The engine speed is 400 RPM or greater for 5 seconds.

• The ignition voltage is 8.6 volts or greater.

• DTC P0974 is not set.


Conditions for Setting the DTC

P0973

The control solenoid valve assembly detects a short to ground on the SS 1 control circuit for 2 seconds.

P0974

The control solenoid valve assembly detects an open or a short to power on the SS 1 control circuit for 2 seconds.

Action Taken When the DTC Sets


P0973

• DTC P0973 is a Type A DTC.

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

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

• 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.



P0974

• DTC P0974 is a Type B DTC.

• The TCM inhibits 1st gear.


Conditions for Clearing the DIC/DTC


• DTC P0973 is a Type A DTC.

• DTC P0974 is a Type B 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. Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.

2. Place the gear selector in Reverse for 5 seconds and then idle the vehicle in Park for 5 seconds. Verify with a scan tool the following test status parameters displays OK:

• Shift Solenoid Valve 1 Control Circuit High Voltage Test Status

• Shift Solenoid Valve 1 Control Circuit Open Test Status

• Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status

3. 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:

• Shift Solenoid Valve 1 Control Circuit High Voltage Test Status

• Shift Solenoid Valve 1 Control Circuit Open Test Status

• Shift Solenoid Valve 1 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