Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0796: Clutch Pressure Control (PC) Solenoid 3 - Stuck OffDTC P0797: Clutch Pressure Control (PC) Solenoid 3 - Stuck On
Circuit/System Description
The clutch pressure control (PC) solenoid 3 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The clutch PC solenoid 3 flows fluid to the low and reverse, and the 4-5-6 clutch. The clutch PC solenoid 3 regulates the transmission fluid pressure to the low and reverse, and 4-5-6 clutch. The 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
| • | No DTCs P0716 or P0717. |
| • | No DTCs P0722 or P0723. |
| • | No DTCs P1825 or P1915. |
| • | Transmission Fluid Temperature (TFT) is equal to or greater than 0°C (32°F). |
DTC P0796
| • | The transmission input shaft speed is greater than 60 RPM. |
| • | low and reverse/4-5-6 clutch is commanded ON. |
DTC P0797
| • | The transmission output shaft speed is greater than 200 RPM. |
| • | low and reverse/4-5-6 clutch is commanded OFF. |
Conditions for Setting the DTC
DTC P0796
The TCM detects an incorrect on-coming clutch gear ratio, or flare, when the low and reverse/4-5-6 clutch is commanded OFF for 0.5 seconds and the transmission input shaft speed is greater than 75 RPM from the anticipated input shaft speed.
DTC P0797
The TCM detects an incorrect off-going clutch gear ratio, or tie-up, when the low and reverse/4-5-6 clutch is commanded ON for 0.2 seconds and the transmission input shaft speed is less than 40 RPM from the anticipated input shaft speed.
Action Taken When the DTC Sets
| • | DTCs P0796 and P0797 are Type A DTCs. |
| • | The TCM commands maximum line pressure. |
| • | The TCM inhibits the torque converter clutch (TCC). |
| • | The TCM freezes transmission adaptive functions. |
Conditions for Clearing the DIC/DTC
DTCs P0796 and P0797 are Type A DTCs.
Diagnostic Aids
When attempting to set transmission performance DTCs, observe the Freeze Frame and Failure Records to assist in duplicating the failure conditions.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
DTC Type Reference
Electrical Information Reference
Scan Tool Reference
Special Tools Required
| • | DT-47825 Control Solenoid Test Plate |
| • | DT-47825-10 Jumper Harness |
Circuit/System Verification
- Perform the Transmission Fluid Check .
- Turn ON the ignition, with the engine OFF.
- Record the DTC Freeze Frame and Failure Records.
- Clear the DTC.
- Operate the vehicle in DRIVE with the calculated throttle position greater than 15% to obtain 72 km/h (45 mph) and achieve 5th gear. Perform this maneuver 2 times.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records.
| ⇒ | If the DTC resets, go to Circuit/System Testing. |
Circuit/System Testing
- Perform the Line Pressure Check
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning and retest the DTC as outlined in the Circuit/System Verification steps.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test .
- Inspect the control valve upper body assembly for sticking valves, damage, scored bores, or debris.
- Inspect the low and reverse/4-5-6 clutch assembly for damage.
| ⇒ | If the pressure is out of specification, correct this concern first. |
| ⇒ | If the DTC resets, continue on with testing. |
| ⇒ | If a concern is found, repair or replace the control solenoid (w/body and TCM) valve assembly. |
| ⇒ | If the solenoid is found to be leaking or stuck closed, replace the control solenoid (w/body and TCM) valve assembly. |
| ⇒ | If a concern if found in the valve body, repair or replace the valve body as necessary. |
| ⇒ | If a concern is found in the low and reverse/4-5-6 clutch assembly, repair or replace as necessary. |
Component Testing
Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
Exercise | Normal Operation | Stuck OFF | Stuck ON |
|---|---|---|---|
Steady State Gears 1st Braking 4, 5, 6 | 1st Braking, 4, 5, 6 | 1st Free Wheel, Neutral | 1st Braking, 4, 5, 6 |
Steady State Gears, 1 Free Wheel 2, 3 | 1st Free Wheel, 2, 3 | 1st Free Wheel, 2, 3 | 1st Braking, 4, 5, 6 |
Garage Shift | Park/Neutral to Reverse/Drive | Neutral 1st Free Wheel | Drive Gear |
Downshift from gears 4, 5, 6 to 1, 2, 3 | 1st Free Wheel, 2, 3 | 1st Free Wheel, 2, 3 | 1st Braking, 4, 5, 6 |
Upshift from gears 1, 2, 3 to 4, 5, 6 | 4, 5, 6 | Neutral | 4, 5, 6 |
Repair Instructions
| • | Perform the Diagnostic Repair Verification after completing the diagnostic procedure. |
| Control valve body replacement. Refer to Control Valve Lower Body and Upper Body Replacement . |
| • | low and reverse/4-5-6 clutch assembly repair or replace. Refer to Low and Reverse Clutch Overhaul and 4-5-6 Clutch Overhaul in the Transmission Unit Repair Manual. |
| • | control solenoid (w/body and TCM) valve assembly replacement. Refer to Control Module References for replacement, setup, and programming. |
| • | Perform the Service Fast Learn Adapts . |
