2010 Cadillac Truck SRX FWD V6-3.0L Page 1779
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)
Antilock Brake System
DTC P0856
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC P0856 00
- Traction Control Torque Request Circuit Malfunction
Circuit/System Description
When traction control is active, the electronic brake control module (EBCM) sends a serial data message to the engine control module (ECM)
requesting torque reduction. When certain ECM DTCs are set, the ECM will not be able to perform the torque reduction for traction control. A
serial data message is sent to the EBCM indicating that traction control is not allowed.
Conditions for Running the DTC
Engine running
Conditions for Setting the DTC
The ECM detects a fault that prevents it from performing a traction control function and sends a serial data message to the EBCM indicating that
torque reduction is not allowed.
Action Taken When the DTC Sets
* The EBCM disables the traction control and stability control for the duration of the ignition cycle.
