2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1494

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1494

If the ECM does not complete the learn or vehicle starting remains disabled, replace the K20 Engine Control Module.

Repair Instructions

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 replacement, setup, and programming

P0634

DTC P0634

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 P0634

- Transmission Control Module (TCM) Overtemperature

Circuit/System Description

The transmission control module (TCM) temperature sensor is located inside of the control solenoid valve assembly which has no serviceable

components. The TCM monitors the TCM sensor for over temperature protection.

Conditions for Running the DTC

* The ignition voltage is greater than 8.6 volts.

* The TCM temperature is between 0-170掳C (32-338掳F) for 0.25 second or greater.

* DTC P0634 has not set this ignition cycle.

Conditions for Setting the DTC

Condition 1

The TCM detects an internal temperature condition greater than 146掳C (295掳F) for 5 seconds or greater.

Condition 2

The ignition voltage is greater than 18 volts and the TCM detects an internal temperature condition greater than 50掳C (122掳F) for 2 seconds.

Action Taken When the DTC Sets

* DTC P0634 is a Type A DTC.

* The TCM defaults the transmission to reverse and 3rd or 5th gear operation.

* The TCM inhibits Tap Up/Down function.

* The TCM inhibits manual shifting of forward gears.

* The TCM commands maximum line pressure.

* The TCM shuts down.

Conditions for Clearing the DTC

DTC P0634 is a Type A DTC.

Reference Information

Description and Operation

Electronic Component Description (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and Operation/6T70/6T75 -

Automatic Transmission/Electronic Component Description) for control solenoid valve assembly

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code