2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 1974
(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.
3. Connect the IMS harness connector to the control solenoid (w/body and TCM) valve assembly. Disconnect the IMS connector. 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 IMS jumper harness.
4. Connect a 3-amp fused jumper wire between each transmission range signal circuit at the IMS connector harness 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 IMS harness.
瀚慖f a signal circuit other than the circuit being grounded displays LOW, replace the IMS harness.
瀚慖f all circuits test normal, replace the IMS.
