P183D
DTC P181C-P181F, P183A-P183E, P184A, or P184B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P184A
- Internal Mode Switch 2 S Circuit Low Voltage
DTC P184B
- Internal Mode Switch 2 S Circuit High Voltage
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
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The internal mode switch (IMS) assembly is a sliding contact switch attached to the control valve body within the transmission. The nine outputs from the switch 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 (HPCM). The input voltage at the module is high when the switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool as IMS Range and IMS Direction. The IMS Range input parameters represented are transmission range signal A, signal B, signal C and signal P. The IMS Direction input parameters represented are IMS Switch 2 signal R1, signal R2, signal D1, signal D2 and signal Start.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
The IMS Direction parameter does not match for the selected gear.
Action Taken When the DTC Sets
* DTCs P181C, P181D, P181E, P181F, P183A, P183B, P183C, P183D, P183E, P184A and P184B are Type B DTCs.
* The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays.
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 Direction IMS assembly can be damaged by electric current exceeding 25 mA. Test the IMS assembly for an open condition whenever a short to voltage condition is observed.
Special Tools
* DT-47825-10 Jumper Harness
* DT 48493 Jumper Harness (24 pins)
Circuit/System Verification
Test for correct operation of the Direction IMS in every range selection.
If the IMS operation matches the logic table, the system is functioning normally.
Circuit/System Testing
1. Disconnect the transmission 24-way connector. Ignition ON. The scan tool Direction IMS parameter should display HI for the R1, R2, D1, D2 and S signal circuit displays.
^ If a signal displays LOW, disconnect the drive motor generator power inverter control module (PIM) connector X1 and test the circuit for a short to ground.
^ If the circuit tests normal, replace the PIM.
2. Install the DT-48493 jumper harness to the vehicle harness. Verify that a test lamp illuminates between the Direction IMS switch ground circuit and battery positive.
^ If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to voltage condition.
^ If the circuit tests normal, replace the PIM.
3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at the DT-48493 jumper harness and the ground circuit terminal. The scan tool parameter should display LOW for each signal circuit when grounded.
^ If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition.
^ If the circuit tests normal, replace the PIM.
4. Disconnect the transmission 16-way connector. Install the DT-47825-10 to the vehicle harness. Connect a 3-amp fused jumper wire between the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.
^ If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition.
^ If the circuit tests normal, replace the PIM.
Important: The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid pan assembly must be removed in order to perform the diagnostic tests.
5. Disconnect the IMS connector at the switch.
Tip: Connect one end of the DT-48493 jumper harness to the transmission connector. Use the other end as the terminal testing point.
^ Test the direction signal circuits and the ground circuit between the IMS and the transmission 24-way connector for a short to ground, open, high resistance or short to voltage condition.
Tip: Connect one end of the DT-47825-10 to the transmission connector. Use the other end as the terminal testing point.
^ Test the Starter signal circuit between the IMS and the transmission 16-way connector for a short to ground, open, high resistance or short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path.
^ If the circuit, including the TCM, tests normal, replace the IMS switch.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair. Verification Tests
* Internal Mode Switch (IMS) Replacement. Refer to Manual Shift Shaft Position Switch Replacement.
* Automatic transmission wiring harness assembly. Refer to Wiring Harness Replacement.