2010 Cadillac Truck Escalade RWD V8-6.2L Page 2445

2010 Cadillac Truck Escalade RWD V8-6.2L Page 2445

P1751

DTC P1751

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 P1751

- Shift Valve 1 Performance

Circuit/System Description

The shift solenoid (SS) 1 is part of the control solenoid valve assembly, which has no serviceable parts. SS 1 provides fluid pressure to control the

operation of the clutch select valve 2, which is located in the control valve lower body assembly. SS 1, in conjunction with clutch select valve 2,

controls fluid to the R1 and 4-5-6 clutches. A diagnostic test is performed by the transmission control module (TCM) to determine the state of the

clutch select valve 2. During this diagnostic test, the TCM commands the SS 1 ON, supplying pressure to move the clutch select valve 2 toward its

spring. At the same time, line pressure is elevated slightly to assist the spring side pressure. If the spring is broken, or the clutch select valve 2

cannot move due to another mechanical condition the DTC will set.

Conditions for Running the DTC

* DTCs P0716, P0717, P0722, P0723, P0741, P0742, P1751, P2762, P2763, or P2764 are not set.

* The engine speed is 500 RPM or greater for 5 seconds or greater.

* The transmission fluid temperature (TFT) is 20-130掳C (68-266掳F).

* The calculated throttle position is between 8-90 percent.

* The engine torque is greater than 50 Nm (36 lb ft).

* No upshift or downshift in process.

* The attained gear slip is 70 RPM or greater.

Conditions for Setting the DTC

The TCM detects attained gear slip is 75 RPM or greater for 1 second.

Action Taken When the DTC Sets

DTC P1751 is a Type B DTC.

Conditions for Clearing the DTC

* DTC P1751 is a Type B DTC.

* The TCM freezes transmission adaptive functions.

Diagnostic Aids

Before performing a road test, configure and setup the scan tool for snapshot mode. This will allow you to display, monitor, and verify multiple

transmission data parameters at one time, after the road test.

Reference Information

Connector End View Reference

* Component Connector End Views (See: Diagrams/Connector Views)

* Inline Harness Connector End Views (See: Power and Ground Distribution/Multiple Junction Connector/Diagrams)

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