2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1669
瀚慖f greater than the specified range, test the ground circuit for an open/high resistance.
4. Ignition ON, verify the scan tool ECM PNP Switch parameter displays In Gear.
瀚慖f not the specified value, test the P/N signal circuit for a short to ground. If the circuit tests normal, replace the engine control module.
5. Connect a 3-amp fused jumper wire between the TCM harness connector terminal 3 and terminal 18. Verify the PNP Switch parameter
changes to Park/Neutral.
瀚慖f not the specified value, test the P/N signal circuit for an open/high resistance. If the circuit tests normal, replace the engine control
module.
6. Ignition OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and Repair/6T70/6T75 - Automatic Transmission/Control Valve Body
Cover Replacement).
7. Connect the TCM harness connector.
8. Disconnect the IMS connector at the control solenoid valve assembly.
9. Ignition ON, verify the scan tool IMS A/B/C/P parameter displays HI for all four signal circuits.
瀚慖f not the specified value, replace the control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control
Module Assembly Replacement (See: Powertrain Management/Transmission Control Systems/Actuators and Solenoids - Transmission
and Drivetrain/Actuators and Solenoids - A/T/Shift Solenoid/Service and Repair).
10. Verify the scan tool ECM PNP Switch parameter displays In Gear.
瀚慖f not the specified value, replace the control solenoid valve assembly.
11. Connect a 3-amp fused jumper wire between each transmission range signal circuit terminal listed below and the IMS ground circuit,
terminal A. Verify the corresponding scan tool IMS A/B/C/P parameter displays LOW when terminals E, D, C, and B are connected to the
IMS ground and the ECM PNP Switch parameter displays Park/Neutral when terminal F is connected to ground.
* Switch Signal A terminal E
* Switch Signal B terminal D
* Switch Signal C terminal C
* Switch Signal P terminal B
* PNP Switch Signal terminal F
瀚慖f not the specified value, replace the control solenoid valve assembly.
12. If all circuits test normal, replace the IMS.
Repair Instructions
Important:
* Perform the Service Fast Learn Adapts (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Testing and
Inspection/Programming and Relearning) following all transmission related repairs.
* Before replacing the TCM, 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/6T70/6T75 - Automatic Transmission/Control Solenoid Valve and Transmission Control Module Assembly Inspection).
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for ECM or control solenoid valve assembly
replacement, setup, and programming
* Range Selector Lever Cable Adjustment (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Shift Linkage/Shift
Cable/Adjustments)
* Control Valve Body Cover Replacement (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Valve Body/Service and
Repair/6T70/6T75 - Automatic Transmission/Control Valve Body Cover Replacement)
* Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (See: Powertrain Management/Computers and Control
Systems/Sensors and Switches - Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair)
P0851
DTC P0850-P0852
Diagnostic Instructions
