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 Descriptor

DTC P0705: Transmission Range (TR) Switch Circuit

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
TR Signal A | P0705 | P0705 | -- | --
TR Signal B | P0705 | P0705 | -- | --
TR Signal C | P0705 | P0705 | -- | --
TR Signal P | P0705 | P0705 | -- | --

### Typical Scan Tool Data

#### Transmission Range (TR) Switch Parameter Data

Circuit | Short to Ground | Open/High Resistance | Short to Voltage
--- | --- | --- | ---
Operating Conditions: Engine running in Park, normal operating temperature Parameter Normal Range: HI when switch open, LOW when switch grounded.
TR Sw. A/B/C/P | LOW | HI | --

### Circuit/System Description

The transmission range (TR) switch is part of the Park/Neutral Position (PNP) switch and is mounted on the transmission manual shaft. The TR switch is a multi-signal switch. The transmission control module (TCM) supplies ignition voltage to the TR switch on 4 signal circuits, A, B, C, and P. Each gear selector lever position grounds one or more of the signal circuits in a unique pattern. In order to determine the gear range selected by the driver, the TCM compares the voltage combination on the signal circuits to a TR switch combination table stored in memory. Refer to Transmission Range Switch Logic.

### Conditions for Running the DTC

The engine is running for 5 seconds.

### Conditions for Setting the DTC

The combination of TR switch signals is invalid for 60 seconds. Refer to Transmission Range Switch Logic.

### Action Taken When the DTC Sets

• | DTC P0705 is a type B DTC.

• | The TCM commands an alternate coast shift pattern where downshifts occur at higher vehicle speeds while coasting.

### Conditions for Clearing the DTC

DTC P0705 is a type B DTC.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Electronic Component Description for park/neutral position switch information

#### 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

J 44152 Jumper Harness (20 pins)

### Circuit/System Verification

1. Ignition ON, engine OFF, observe the scan tool TR Sw. parameter while moving the gear shift lever from Park, to Reverse and through all the ranges. The parameter should match each gear range that is selected.
2. Observe the TR Sw. A/B/C/P parameter while moving the gear shift lever from Park, to Reverse and through all the ranges. The TR Sw. A/B/C/P parameter should correspond with the Transmission Range Switch Logictable.
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

### Circuit/System Testing

1. Ignition OFF, disconnect the PNP switch harness connector.
2. Ignition ON, verify the scan tool TR. Sw. A/B/C/P parameter is HI/HI/HI/HI.

⇒ | If not the specified value, test each signal circuit for a short to ground. If all circuits test normal, replace the TCM.

3. Ignition OFF, test for less than 10 ohms between terminal 11 on the harness side and ground.

⇒ | If greater than the specified value, check the ground circuit for an open/high resistance.

4. If all circuits test normal test or replace the PNP Switch.

### Component Testing

Using a DMM, connect one lead to the PNP Switch ground circuit terminal 11, and the other lead to each of the following PNP Switch signal circuit terminals and compare the readings to the Transmission Range Switch Logictable for each gear selector position.

• | Terminal 9

• | Terminal 8

• | Terminal 10

• | Terminal 2

Important: A DMM reading of less than 10 ohms corresponds to LOW on the logic Table. A DMM reading of infinite resistance corresponds to HIGH on the logic Table.

⇒ | If not the specified value, replace the PNP Switch.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• | Park/Neutral Position Switch Replacement

• | Control Module References for TCM replacement, setup, and programming.