P0736

DTC P0736

DTC Descriptor
This diagnostic procedure supports the following DTC:

DTC P0736 Incorrect Reverse Ratio

Diagnostic Fault Information

Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview

Circuit/System Description
The clutch pressure control (PC) solenoid 2 flows fluid to the 3-5-R clutch when commanded OFF and exhausts fluid when commanded ON. The clutch PC solenoid 2 regulates the transmission fluid pressure to the 3-5-R clutch. The transmission fluid pressure (TFP) switch 1 Opens (High) under fluid pressure and closes (Low) when no pressure is present. The transmission control module (TCM) calculates gear ratio based on data from the automatic transmission input speed sensor (ISS) and the output speed sensor (OSS). The TCM compares the known transmission gear ratio to a calculated gear ratio for each commanded gear.

Conditions for Running the DTC
^ 3-5-R clutch is the primary on-coming clutch.
^ The commanded gear is Reverse.

Conditions for Setting the DTC
TFP Switch 1 = Low (No fluid pressure).

Action Taken When the DTC Sets
DTC P0736 is a Type A DTC.

Conditions for Clearing the DTC
DTC P0736 is a Type A DTC.

Diagnostic Aids
When attempting to set transmission performance DTCs, it may be helpful to observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions. Ensure the transmission fluid level is correct and there are no leaks. If there are any other transmission DTCs set, diagnose those first.

Reference Information

Schematic Reference

Connector End View Reference
^ Automatic Transmission Inline 16-Way Connector End View
^ Automatic Transmission Internal Connector End Views

DTC Type Reference
^ Diagnostic Trouble Code (DTC) Type Definitions
^ Diagnostic Trouble Code (DTC) List/Type

Electrical Information Reference
^ Circuit Testing
^ Connector Repairs
^ Testing for Intermittent Conditions and Poor Connections
^ Wiring Repairs

Circuit/System Verification
1. Operate the vehicle to induce a shift from second to third gear while observing TFP Switch 1. Perform this action 2 times. The TFP Switch 1 should change states from Low to High. If the TFP Switch does not change states and no other DTCs set, replace the control solenoid (w/body and TCM) valve assembly.If any other DTCs set, diagnose that DTC first.
2. Operate the vehicle to obtain sixth gear 2 times and then check for DTCs other than DTC P0736. If any other DTCs set, diagnose that DTC first. If no other DTC sets, continue on with diagnostics.
3. Operate the vehicle by shifting from Park to Reverse, then while in reverse, operate the vehicle with the calculated throttle position greater than 8% for 5 seconds, perform this maneuver a minimum of 3 times. If the DTC P0736 resets, go to Component Testing.

Component Testing
1. Perform the line test procedure.
2. Inspect the check ball 5 for possible sticking or damage. If you found a concern with this check ball, repair the concern.
3. Inspect the shift select valve 3 for sticking or damage. If you found a concern with the shift select valve 3, repair or replace the valve or valve body.
4. Inspect the R-1 (Low and Reverse clutch) assembly for wear or damage.If you found a R-1 assembly concern, repair or replace the R-1 assembly as necessary.

Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests
^ Control solenoid (w/body and TCM) valve assembly. Refer to Control Module References for replacement, setup, or programming. Programming and Relearning
^ R-1 assembly replacement.
^ Lower valve body assembly.