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P1915




DTC P182E or P1915

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 P182E
- Internal Mode Switch Indicates Invalid Range

DTC P1915
- Internal Mode Switch Does Not Indicate Park/Neutral During Start

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The internal mode switch (IMS) assembly is a sliding contact switch attached to the manual shift detent lever shaft inside the transmission. The 4 inputs to the transmission control module (TCM) from the switch indicate which position is selected by the transmission manual shaft. The input voltage at the TCM 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. The IMS input parameters represented are transmission range Signal A, Signal B, Signal C, and Signal P.

Conditions for Running the DTC

P182E
* The engine speed is 400 RPM or greater for 5 seconds.
* The ignition voltage is 9.0 volts or greater.
* DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0722, or P0723 is not set.
* The engine torque signal is valid.

P1915
* DTC P0722, P0723, or P1915 is not set.
* The transmission output shaft speed is 90 RPM or less.
* The ignition voltage is 6.0 volts or greater.

Conditions for Setting the DTC

P182E

The IMS does not indicate a valid Park, Reverse, Neutral, or Drive Range position for 7 seconds.

P1915

The manual shift shaft switch assembly does not indicate Park or Neutral during the following sequence:

* The engine speed is less than 50 RPM for greater than 0.10 second.
* The engine speed is 50-480 RPM for greater than 0.07 second.
* The engine speed is greater than 500 RPM and the transmission input speed is greater than 100 RPM for greater than 1.25 seconds.

Action Taken When the DTC Sets

* DTCs P182E and P1915 are Type A DTCs.
* The TCM commands maximum line pressure.
* The TCM turns OFF all solenoids.
* The TCM freezes transmission adaptive functions.
* The TCM limits the transmission to reverse and 5th gear.
* The TCM forces the torque converter clutch (TCC) OFF.
* The TCM inhibits the Tap Up/Tap Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM turns the high side driver OFF.
* The TCM enables torque management.

Conditions for Clearing the DTC

DTCs P182E and P1915 are Type A DTCs.

Reference Information
Schematic Reference

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

* Component Connector End Views (Connector End Views By Name)
* Inline Harness Connector End Views (Connector End Views By Number)

Description and Operation

* Transmission General Description (Transmission General Description)
* Transmission Component and System Description (Transmission Component and System Description)
* Electronic Component Description (Electronic Component Description) for manual shift detent lever with shaft position switch assembly

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. Perform the Range Selector Lever Cable Adjustment (Adjustments) procedure to verify proper adjustment.
2. Ignition ON, engine OFF, observe the scan tool TCM Internal Mode Switch A/B/C/P parameter while moving the gear shift lever from Park, to Reverse and through all the ranges. The parameter should match each range that is selected. Refer to Transmission Internal Mode Switch Logic (Transmission Internal Mode Switch Logic).
3. Observe the scan tool engine control module (ECM) PNP Switch parameter while moving the gear shift lever from Park, to Reverse and through all the ranges. The parameter should display Park/Neutral in the Park and Neutral positions, and In Gear in all other positions.

• If not the expected results, refer to DTC P0850-P0852 (P0850).

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 Circuit/System Verification first.

1. Remove the 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).
2. Connect the vehicle harness connector to the control solenoid valve assembly.
3. Disconnect the IMS connector at the control solenoid valve assembly.
4. Ignition ON, verify the scan tool TCM Internal Mode Switch A/B/C/P parameter displays High for all 4 signal circuits.

• If not the specified value, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement (Service and Repair).

5. Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the IMS ground circuit, terminal F. The appropriate scan tool IMS A/B/C/P parameter should display Low when the terminal is connected to the IMS ground.

* Switch Signal A: terminal B to terminal F
* Switch Signal B: terminal C to terminal F
* Switch Signal C: terminal D to terminal F
* Switch Signal P: terminal E to terminal F

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

6. If all circuits test normal, replace the IMS. Refer to Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (Service and Repair).

Repair Instructions

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

Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (Control Solenoid Valve and Transmission Control Module Assembly Inspection).

* Refer to Control Module References (Programming and Relearning) for control solenoid valve assembly replacement, setup, and programming.
* Perform the Transmission Adaptive Values Learn (Programming and Relearning) following all transmission related repairs.
* For IMS replacement, perform the Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (Service and Repair).

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