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P184B




DTC P181C-P181F, P183A-P183E, P184A, or P184B

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 Descriptor
DTC P181C
- Internal Mode Switch 2 R1 Circuit Low Voltage

DTC P181D
- Internal Mode Switch 2 R1 Circuit High Voltage

DTC P181E
- Internal Mode Switch 2 R2 Circuit Low Voltage

DTC P181F
- Internal Mode Switch 2 R2 Circuit High Voltage

DTC P183A
- Internal Mode Switch 2 D1 Circuit Low Voltage

DTC P183B
- Internal Mode Switch 2 D1 Circuit High Voltage

DTC P183C
- Internal Mode Switch 2 D2 Circuit Low Voltage

DTC P183D
- Internal Mode Switch 2 D2 Circuit High Voltage

DTC P183E
- Internal Mode Switch 2 Invalid Range

DTC P184A
- Internal Mode Switch 2 S Circuit Low Voltage

DTC P184B
- Internal Mode Switch 2 S Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The automatic transmission manual shift shaft position switch assembly, also called the internal mode switch assembly, contains two sliding hall-effect switch assemblies attached to the control valve body within the transmission. The 9 outputs from the switches indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P) are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module. The Range input signals are represented as TCM scan tool parameters Internal Mode Switch A, B, C, and P. The Direction input signals are represented as hybrid powertrain control module scan tool parameters Internal Mode Switch 2 - R1, R2, D1, D2, and S. The input voltage at the modules is high when a switch is open and low when a switch is closed to ground. Each control module independently supplies power and ground to its respective switch assembly.

The hybrid powertrain control module is internal to the power inverter module, often referred to as the drive motor generator power inverter module, and is not serviced separately.

Conditions for Running the DTC

* The vehicle is ON for at least 5 seconds.
* The ignition voltage is greater than 9.0 V.

Conditions for Setting the DTC

The direction internal mode switch state does not match a selected gear for 5 seconds.

Action Taken When the DTC Sets

DTCs P181C, P181D, P181E, P181F, P183A, P183B, P183C, P183D, P183E, P184A and P184B are Type B DTCs.

Conditions for Clearing the DTC

DTCs P181C, P181D, P181E, P181F, P183A, P183B, P183C, P183D, P183E, P184A and P184B are Type B DTCs.

Diagnostic Aids

* The internal mode switch assembly can be damaged by electric current exceeding 25 mA. Test the internal mode switch assembly for an open condition whenever a short to voltage condition is observed.
* The internal mode switch is a non-serviceable part of the manual shift shaft position switch.

Reference Information
Schematic Reference

* Hybrid Controls Schematics Hybrid Controls Schematics
* Automatic Transmission Controls Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1
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-44152 - Jumper Harness

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

Circuit/System Verification

Vehicle ON, observe the scan tool internal mode switch 2 parameters while moving the gear shift lever from Park, through all gear selector positions, and back to Park. The parameters should match each gear range that is selected. Refer to Internal Mode Switch 2 Parameters table below:






Circuit/System Testing

1. Vehicle OFF. Disconnect the X175 20-way harness connector at the transmission. Additional DTCs may set.
2. Install the DT-44152 - jumper harness to the harness side only.
3. Vehicle OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 ohm between the low reference circuit terminal G and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the T6 power inverter module.

4. Vehicle ON, verify each scan tool D1/D2/R1/R2/S parameter displays high.

• If any parameter displays low, test that signal circuit terminal, as listed below, for a short to ground. If the circuit tests normal, replace the T6 power inverter module.

* Parameter D1 - terminal E
* Parameter D2 - terminal F
* Parameter R1 - terminal C
* Parameter R2 - terminal D
* Parameter S - terminal B

5. Install a 3 A fused jumper wire between each terminal listed below one at a time and ground. Verify each scan tool D1/D2/R1/R2/S parameter displays low when grounded.

• If a parameter displays high when grounded, test that signal circuit terminal, as listed below, for a short to voltage or an open/high resistance. If the circuit tests normal, replace the T6 power inverter module.

* Parameter D1 - terminal E
* Parameter D2 - terminal F
* Parameter R1 - terminal C
* Parameter R2 - terminal D
* Parameter S - terminal B

6. If the circuits test normal, test or replace the transmission internal extension harness or the automatic transmission B15 internal mode switch.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Manual Shift Shaft Position Switch and Fluid Level Control Valve Removal 5. Manual Shift Shaft Position Switch and Fluid Level Control Valve Removal and Manual Shift Shaft Position Switch and Fluid Level Control Valve Installation 94. Manual Shift Shaft Position Switch and Fluid Level Control Valve Installation for Internal Mode Switch replacement
* Automatic Transmission Wiring Harness and Output Speed Sensor Removal 12. Automatic Transmission Wiring Harness and Output Speed Sensor Removal for Wiring Harness Extension Harness replacement
* Control Module References Programming and Relearning for Drive Motor Generator Power Inverter Module, also called the power inverter module, replacement, programming and setup

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