2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2457
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.
Component Testing
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
Important: Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic
Transmission/Control Solenoid Valve and Transmission Control Module Assembly Inspection) for the following components before replacing
the components.
* Manual Shift Shaft Position Switch Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches -
Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair/2ML70 - Automatic Transmission) for IMS
replacement.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid (w/body and TCM) valve
assembly replacement, setup, and programming.
* Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Wiring Harness/Service and
