2010 Cadillac Truck Escalade/ESV 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
