2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2815

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2815

* The TCM detects an invalid range from the IMS for 3.25 seconds.

* The IMS signal circuit C is high in D for greater than 8 seconds.

* Park/Neutral Switch equals P/N and the IMS state is not Park or Neutral, or the Park/Neutral switch is not Park or Neutral and the IMS state

equals Park or Neutral for 4 seconds.

* Or the automatic transmission manual shift shaft position switch assembly indicates a transitional state for 8 seconds.

Action Taken When the DTC Sets

* The TCM commands maximum line pressure.

* The TCM turn OFF all solenoids.

* The TCM freezes transmission adaptive functions.

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

Conditions for Clearing the DTC

DTCs P1824, P182A-P182F, P1838, and P1839 are Type B DTCs.

Diagnostic Aids

The IMS connects electrically to the control solenoid (w/body and TCM) valve assembly and is serviced separately from the control solenoid

(w/body and TCM) valve assembly. Inspect the IMS, harness, connector, and control solenoid (w/body and TCM) valve assembly pins for metallic

debris. Use a terminal test kit for any test that requires probing the control solenoid (w/body and TCM) valve assembly harness connector or a

component harness connector. The IMS assembly can be damaged by currents exceeding 2 mA. Test the IMS assembly for an open condition

whenever a short to voltage condition is observed.

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)

Electrical Information Reference

* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit

Testing/Circuit Testing)

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

Procedures/Connector Repairs/Connector Repairs)

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

Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)

* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring

Repairs/Wiring Repairs)

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

Test for the correct operation of the IMS. Refer to Transmission Internal Mode Switch Logic (See: Specifications/Mechanical

Specifications/Automatic Transmission/Transaxle/System Specifications/2ML70 - Automatic Transmission/Transmission Internal Mode Switch

Logic).

If the IMS operation matches the IMS logic table, the system if functioning normally.

Circuit/System Testing

1. Disconnect the IMS harness connector at the control solenoid (w/body and TCM) valve assembly. Ignition ON. The scan tool IMS A/B/C/P

parameter should display HI for all 4 signal circuits.

瀚慖f a signal circuit displays LOW, replace the control solenoid (w/body and TCM) valve assembly.

2. Connect a 3-amp fused jumper wire between each transmission range signal circuit at the control solenoid (w/body and TCM) valve assembly

and ground. With a scan tool, ensure that each signal circuit displays LOW when connected to ground.

瀚慖f a signal circuit remains HI when connected to ground, replace the control solenoid (w/body and TCM) valve assembly.