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 P0706: Transmission Range (TR) Switch Performance
DTC P0707: Transmission Range (TR) Switch Circuit Low Voltage
DTC P0708: Transmission Range (TR) Switch Circuit High Voltage

### Circuit/System Description

The transmission range (TR) switch is an integral part of the transmission control module (TCM). The TR switch input/output circuitry consists supply voltage (Vcc), ground (GND), position signal 1 (Pos1), and position signal 2 (Pos2). Each gear range position (P, R, N, D, 4, 3, and 2) corresponds to a particular voltage (1-5 volts) within the TCM.

### Conditions for Running the DTC

#### P0706

• | The ignition is ON, or the engine is operating.

• | The transmission is not in Service Mode.

• | There is not a Transmission Range Switch Circuit Low Voltage DTC, P0707.

#### P0707 and P0708

• | The ignition is ON, or the engine is operating.

• | The transmission is not in Service Mode.

### Conditions for Setting the DTC

#### P0706

The TCM detects that the TR switch position sensor is stuck for 0.5 second.

#### P0707

The TCM detects that the TR switch position sensor circuit is open or shorted to ground for 0.5 second.

#### P0708

The TCM detects that the TR switch position sensor circuit is shorted to voltage for 0.5 second.

### Action Taken When the DTC Sets

• | DTC P0706, DTC P0707, and DTC P0708 are Type A DTCs.

• | The TCM will use the previous range information.

• | The transmission will operate in 5th gear only in D or M range.

• | The TCM inhibits 1st gear.

• | The TCM inhibits engine start.

• | The TCM inhibits Self-learning

### Conditions for Clearing the DTC

DTC P0706, DTC P0707, and DTC P0708 are Type A DTCs

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

• | Electrical Center Identification Views

• | Component Connector End Views

• | Splice Pack Connector End Views

• | Inline Harness Connector End Views

#### 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

• | Diagnostic Trouble Code (DTC) List - Vehicle

### Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool.
2. Record Freeze Frame and Failure Records.
3. Clear DTCs.
4. Operate the vehicle under the conditions observed in the Failure Records.
5. Observe the DTC information with the scan tool. Verify that DTC P0706, P0707, or P0707, or P0708 does not set.

⇒ | If specified DTC sets, replace the TCM, refer to Transmission Control Module Removal procedure and Transmission Control Module Installation procedure.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.