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MVA 4 Speed - Automatic Transmission




DTC P0705

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC P0705
- Transmission Range Sensor Circuit Malfunction

Diagnostic Fault Information





Circuit/System Description

The park neutral switch, transmission range selector switch, and overdrive defeat switch are inputs to the engine control module (ECM). Voltage is supplied to the park neutral switch from the ignition switch when in the crank position. When the ignition is in the crank position and the gear selector is in the park or neutral position, the park neutral switch signal to the ECM will be high. Voltage to the transmission range switch is supplied from an ignition source in the IP fuse block. As the gear selector is moved to the various positions, the appropriate signal circuit input to the ECM will be high. Voltage to the overdrive defeat switch is supplied from the drive switch signal circuit. When the gear selector is in the drive position and the overdrive defeat switch is pressed, the overdrive defeat switch signal to the ECM will be high.

Conditions for Running the DTC

* Ignition is ON
* Battery voltage is above 10.5 V

Conditions for Setting the DTC

* None of the transmission range selector switch inputs are active.
* Two or more of the transmission range selector switch inputs are active at the same time.
* The park neutral switch input is active while any of the following transmission range selector switch inputs are active:

- Reverse
- Drive
- 2
- Low

* The overdrive defeat switch input is active while the park neutral switch input or any of the following transmission range selector switch inputs are active:

- Park
- Reverse
- Neutral

Action Taken When the DTC Sets

* DTC P0705 is a type B DTC
* Engine start disabled

Conditions for Clearing the DTC

DTC P0705 is a type B DTC

Reference Information
Schematic Reference

* Automatic Transmission Controls Schematics (Electrical Diagrams)
* Starting and Charging Schematics (Electrical Diagrams)

Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

Park Neutral Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the park neutral position switch assembly.
2. Ignition in CRANK, verify that a test lamp illuminates between the crank voltage circuit terminal 4 and ground.

• If the test lamp does not illuminate, test the crank voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal refer to.

3. Connect the harness connector at the park neutral position switch assembly.
4. Disconnect the X1 harness connector at the ECM.
5. Connect a test lamp between the park neutral switch signal circuit terminal 48 and ground.
6. Ignition in CRANK, move the gear selector through the full range. The test lamp should turn ON and OFF when changing from the park and neutral positions to the remainder of the selector positions.

• If the test lamp is always ON, test the park neutral switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the park neutral switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

7. If all circuits test normal, replace the ECM.

Transmission Range Selector Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the park neutral position switch assembly.
2. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

3. Connect the harness connector at the park neutral position switch assembly.
4. Disconnect the X2 harness connector at the ECM.
5. Connect a test lamp between the park switch signal circuit terminal 73 and ground.
6. Ignition ON, move the gear selector in and out of the park position. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the park switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the park switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

7. Connect a test lamp between the reverse switch signal circuit terminal 53 and ground.
8. Ignition ON, move the gear selector in and out of the reverse position. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the reverse switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the reverse switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

9. Connect a test lamp between the neutral switch signal circuit terminal 54 and ground.
10. Ignition ON, move the gear selector in and out of the neutral position. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the neutral switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the neutral switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

11. Connect a test lamp between the drive switch signal circuit terminal 56 and ground.
12. Ignition ON, move the gear selector in and out of the drive position. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the drive switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the drive switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

13. Connect a test lamp between the 2 switch signal circuit terminal 55 and ground.
14. Ignition ON, move the gear selector in and out of the 2 position. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the 2 switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the 2 switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

15. Connect a test lamp between the low switch signal circuit terminal 74 and ground.
16. Ignition ON, move the gear selector in and out of the low position. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the low switch signal circuit for a short to voltage. If the circuit tests normal, replace the park neutral position switch assembly.
• If the test lamp is always OFF, test the low switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the park neutral position switch assembly.

17. If all circuits test normal, replace the ECM.

Overdrive Defeat Switch Circuit Test
1. Ignition OFF, disconnect the harness connector at the overdrive defeat switch.
2. Ignition ON gear selector in DRIVE, verify that a test lamp illuminates between the drive switch signal circuit terminal 1 and ground.

• If the test lamp does not illuminate, test the drive switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, refer to Transmission Range Selector Switch Circuit Test.

3. Connect the harness connector at the overdrive defeat switch.
4. Disconnect the X1 harness connector at the ECM.
5. Connect a test lamp between the overdrive defeat switch signal circuit terminal 26 and ground.
6. Ignition ON gear selector in DRIVE, activate and deactivate the overdrive defeat switch. The test lamp should turn ON and OFF when changing between the commanded states.

• If the test lamp is always ON, test the overdrive defeat switch signal circuit for a short to voltage. If the circuit tests normal, replace the overdrive defeat switch.
• If the test lamp is always OFF, test the overdrive defeat switch signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the overdrive defeat switch.

7. If all circuits test normal, replace the ECM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Park/Neutral Position Switch Replacement (MVA 4 Speed - Automatic Transmission)
* Control Module References (Programming and Relearning) for ECM replacement, programming, and setup.

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