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P0850




DTC P0850-P0852

Diagnostic Instructions

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

DTC Descriptors
DTC P0850
- Park/Neutral Position (PNP) Switch Circuit

DTC P0851
- Park/Neutral Position (PNP) Switch Circuit Low Voltage

DTC P0852
- Park/Neutral Position (PNP) Switch Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The transmission manual shift shaft switch assembly, also known as the internal mode switch (IMS), is a sliding contact switch attached to the manual shift shaft inside the transmission case. The park/neutral position (PNP) switch is integrated into the IMS and connects to the transmission control module (TCM) lead-frame through a short wire harness. The park/neutral signal circuit uses the TCM as a pass-through connector only. The TCM provides the low reference circuit to the PNP switch.

The Park/Neutral Signal is sent from the park/neutral switch directly to the engine control module (ECM) and is used for engine start enable.

Conditions for Running the DTC

* Ignition voltage is between 8-18 volts.
* Engine speed is greater than 1,000 RPM.

Conditions for Setting the DTC

P0850 and P0851
* The ECM detects the park/neutral switch signal equals 0 volts, park/neutral, when the IMS reports a Drive range for 0.2 second.
* The throttle position is 10 percent or greater.
* The engine torque is 75 Nm (55 lb ft) or greater.
* The vehicle speed is 10 km/h (6 mph) or greater.

P0852

The ECM detects the park/neutral switch signal equals 12 volts, In-Gear, when the IMS reports a park/neutral range for 0.2 second.

Action Taken When the DTC Sets

* DTCs P0850, P0851, and P0852 are Type C DTCs.
* The ECM uses IMS Range for engine start-up.

Conditions for Clearing the DTC

DTCs P0850, P0851, and P0852 are Type C DTCs.

Reference Information
Schematic Reference

Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Electronic Component Description (Electronic Component Description)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

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

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

DT-48616-10 - Adapter Harness

For equivalent regional tools, refer to Special Tools (Tools and Equipment).

Circuit/System Verification

1. If there are any other transmission DTCs set, diagnose those DTCs first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle).
2. Ignition ON, observe the scan tool ECM Park/Neutral switch parameter while moving the gear shift lever from Park and through all ranges. The parameter should display Park/Neutral when in Park or Neutral and In-Gear when in Reverse or Drive.
3. Observe the scan tool TCM IMS parameter while slowly moving the gear shift lever from Park through all ranges. Verify the gear position matches the scan tool parameter.

• If not the specified value, refer to Range Selector Lever Cable Adjustment (Adjustments).

4. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections).

Circuit/System Testing

Note: You must perform the Circuit/System Verification first.

1. Ignition OFF, disconnect the 14-way harness connector at the transmission.
2. Install the DT-48616-10 - harness to the 14-way harness connector to the engine harness.
3. Test for less than 10 ohms between the ground circuit terminal 2 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, engine OFF, test for 11-13 volts between the adapter harness terminal 3 and ground.

• If not within the specified range, test the park/neutral signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ECM.

5. Ignition OFF, disconnect the DT-48616-10 - harness from the vehicle harness connector.
6. Remove the transmission control valve body cover. Refer to Control Valve Body Cover Replacement (LDE, LUW) (Control Valve Body Cover Replacement)Control Valve Body Cover Replacement (LLU, LUJ) (Control Valve Body Cover Replacement).
7. Connect the vehicle harness connector to the control solenoid valve assembly.
8. Disconnect the automatic transmission internal mode switch electrical connector from the TCM.
9. Ignition ON, engine OFF, test for 11-13 volts between terminal A on the TCM and ground at the transmission case.

• If not within the specified range, replace the control solenoid valve assembly.

10. Connect a 3A fused jumper wire between the IMS connector terminal A and ground. Verify with a scan tool the Park/Neutral Position Switch parameter changes from In Gear to Park/Neutral when connected to ground.

• If not the expected results, test the signal circuit for an open/high resistance or a short to ground or voltage. If circuit tests normal, replace the ECM.

11. If all circuits test normal, replace the automatic transmission internal mode switch.

Repair Instructions

Note:
* Perform the Transmission Adaptive Values Learn (Programming and Relearning) following all transmission related repairs.
* Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).

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

* Control Module References (Programming and Relearning) for ECM or control solenoid valve assembly replacement, setup, and programming
* Range Selector Lever Cable Adjustment (Adjustments)
* Control Valve Body Cover Replacement (LDE, LUW) (Control Valve Body Cover Replacement)Control Valve Body Cover Replacement (LLU, LUJ) (Control Valve Body Cover Replacement)
* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (Service and Repair)

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