The following fault table gives examples of how hydraulic circuit problems and malfunctioning hard parts affect the transmission operation.

The shift valve 1 (clutch select valve 2) is part of the lower control valve body. The shift valve 1 (clutch select valve 2) controls fluid to the R1 and 4-5-6 clutches. During this diagnostic test, intrusive actions are taken by the transmission control module (TCM) to test the clutch select valve 2 to see if the valve is stuck. The TCM commands the shift solenoid (SS) 1 ON to put pressure on the valve towards the spring and at the same time, elevates line pressure slightly to assist the spring side pressure. If the spring is broken, the valve will slip back towards the spring indicating a mechanical failure and the DTC will set.

The TCM detects attained gear slip is 150 RPM or greater for 0.5 second 5 times during the same ignition cycle.

DTC P1751 is a Type B DTC.

DTC P1751 is a Type B DTC.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Perform the Transmission Fluid Check .
2. While operating the vehicle in drive with the calculated throttle position greater than 8 percent and the attained gear slip less than 1,100 RPM, command the TCC is commanded ON and OFF a minimum of 5 times.

⇒	If the DTC resets, go to Component Testing.

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Perform the Line Pressure Check .

⇒	If the pressure is out of specification, correct this concern first.

2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning procedure in an attempt to clean or free up a potential sticking valve of dirt or debris. Retest the DTC as outlined in the Circuit/System Verification steps.

⇒	If the DTC resets after the cleaning procedure perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .

3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .

⇒	If the SS 1 is found to be leaking or stuck, replace the control solenoid (w/body and TCM) valve assembly.

⇒	If the control solenoid (w/body and TCM) valve assembly shift solenoid functions correctly, inspect the lower control valve body assembly for the following:

•	Clutch select valve 2 (CSV2) and valve body bore for scratches, gouges, scuffing, scoring, debris, or damage. The valve should move freely in the bore without stopping or binding.

⇒	If you found a valve body concern, repair or replace the lower control valve body as necessary.

•	Inspect the CSV2 fluid circuits for blockage.

•	Inspect the CSV2 valve spring for damage, distortions, or broken coils.

4. Inspect the TCC control valve in the pump cover assembly.

⇒	If you found a TCC control valve concern, repair or replace the TCC control valve or pump as necessary.

5. Inspect the torque converter assembly for damage or discoloration.

⇒	If you found a torque converter assembly concern, replace the torque converter assembly as necessary.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.