For 1990-2009 cars

### 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 (SS) 1 Control Circuit Low Voltage
DTC P0974: Shift Solenoid (SS) 1 Control Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Shift Solenoid (SS) 1 Control | P0973 | P0974 | P0974 | --
Shift Solenoid (SS) 1 High Side Driver 2 | P1833 | P1833 | P1834 | --

### Typical Scan Tool Data

#### Shift Solenoid (SS) 1

Circuit | Short to Ground | Open/High Resistance | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK
Shift Sol. 1 CKT Status | Short to GND | Open | Short to Voltage
High Side Driver 2 CKT Status | Open/Short to GND | Open/Short to GND | Short to Voltage

### Circuit/System Description

The shift solenoid (SS) 1 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The control solenoid (w/body and TCM) valve assembly supplies 12 volts to SS 1 on the high side driver 2 circuit. The control solenoid (w/body and TCM) valve assembly controls the normally closed SS 1 on the SS 1 control circuit. The SS 1 controls the transmission fluid to the Mode-2 valve. In the OFF position no oil is supplied to the clutch pressure control (PC) solenoid 3 or the transmission fluid pressure (TFP) switch 5, and the 4-5-6 clutch is fed by drive fluid. In the ON position, Reverse fluid is allowed to flow and is supplied to the 3-5-R clutch.

### Conditions for Running the DTC

#### P0973

• | DTC P0973 is not set.

• | Start the ignition voltage, run the engine.

#### P0974

• | DTC P0974 is not set.

• | Start the ignition voltage, run the engine.

### Conditions for Setting the DTC

#### P0973

• | The control solenoid (w/ body and TCM) assembly detects a internal low voltage electrical malfunction of the SS 1 control circuit.

• | Last for 1.2 seconds in the 1.5 seconds sample time.

#### P0974

• | The control solenoid (w/ body and TCM) assembly detects a internal high voltage electrical malfunction of the SS 1 control circuit.

• | Last for 1.2 seconds in the 1.5 seconds sample time.

### Action Taken When the DTC Sets

• | DTC P0973 and P0974 are Type B DTCs.

• | The TCM defaults the transmission to 3rd gear if the current gear is 1st, 2nd, or 3rd, or 5th gear if the current gear is 4th, 5th, or 6th gear.

• | The TCM inhibits the Torque Converter Clutch (TCC).

• | The TCM commands maximum line pressure.

• | The TCM freezes transmission adaptive functions.

### Conditions for Clearing the DIC/DTC

• | DTC P0973 is a type A DTC.

• | DTC P0974 is a type B DTC.

### Diagnostic Aids

When attempting to set solenoid electrical DTCs, ensure the control solenoid (w/body and TCM) valve assembly is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

• | Automatic Transmission Inline 16-Way Connector End View

• | Automatic Transmission Internal Connector End Views

• | Automatic Transmission Related Connector End Views

#### DTC Type Reference

• | Diagnostic Trouble Code (DTC) Type Definitions

• | Diagnostic Trouble Code (DTC) List/Type

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

• | Scan Tool Output Controls

• | Scan Tool Data List

• | Scan Tool Data Definitions

### Circuit/System Testing

1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
2. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
3. Place the gear selector in Reverse for 5 seconds and then idle vehicle for 5 seconds.
4. Observe the scan tool data parameter Shift Sol. 1 CKT Status. The parameter should display 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 .

⇒ | If no concerns are found during the inspection, replace the control solenoid (w/body and TCM) valve assembly.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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