2010 Cadillac CTS Sedan AWD V6-3.0L Page 1783

2010 Cadillac CTS Sedan AWD V6-3.0L Page 1783

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

P1915

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

* The engine speed is less than 50 RPM for more than 0.15 seconds.

* The engine speed is 50-480 RPM for more than 0.07 seconds.

* The engine speed is greater than 525 RPM for more than 3.25 seconds.

* The transmission input shaft speed is 200 RPM or greater.

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 - HSD1 and HSD2.

* The TCM freezes transmission adaptive functions.

* The TCM defaults the transmission to third gear if the current gear is 1st, 2nd, or 3rd; or fifth gear if the current gear is 4th, 5th, or 6th gear.

* The TCM inhibits TCC.

* The TCM inhibits Tap up and Tap down functions.

Conditions for Clearing the DTC

DTCs P182E and P1915 are Type A DTCs.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Diagrams)

Connector End View Reference

* Component Connector End Views (See: Diagrams/Connector Views)

* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit Testing/Circuit Testing)

* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Connector Repairs/Connector Repairs)

* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/Circuit

Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/Wiring Repairs/Wiring Repairs)

Description and Operation

* Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/Electronic Component Description)

* Transmission General Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/Transmission General Description)

* Transmission Component and System Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and

Operation/Transmission Component and System Description)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code

(DTC) Type Definitions)

Scan Tool Reference

Control Module References (See: Testing and Inspection/Programming and Relearning) for scan tool information

Circuit/System Verification

1. Perform the Shift Control Linkage Adjustment (All Wheel Drive) (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Shift Linkage/Adjustments)Shift Control Linkage Adjustment (Rear Wheel Drive) (See: Transmission and

Drivetrain/Automatic Transmission/Transaxle/Shift Linkage/Adjustments) procedure to verify proper adjustment.

2. Ignition ON, observe the scan tool IMS parameter while moving the gear shift lever from Park, through all gear selector positions, and back

to Park. The parameter should match each gear range that is selected. Refer to Transmission Internal Mode Switch Logic (See:

Specifications/Mechanical Specifications/Automatic Transmission/Transaxle/System Specifications/Transmission Internal Mode Switch

Logic).

3. Observe the scan tool Engine Control Module P/N switch parameter with the gear selector in Park and Neutral position. The parameter