P07A3
DTC P07A3
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 Descriptor
DTC P07A3
- Transmission Friction Element 1 Stuck On
Typical Scan Tool Data
Circuit/System Description
The hybrid powertrain control module (HPCM) monitors the Clutch Slip parameters for each Hybrid Trans. Mode Commanded state. This DTC detects no clutch slip when the hybrid low 1-2 clutch is commanded OFF, indicating a stuck or welded clutch condition.
Conditions for Running the DTC
Hybrid low 1-2 clutch is the primary off-going clutch.
The commanded gear is:
* Gear 3
* Gear 4
* EVT mode 2
Conditions for Setting the DTC
The TCM detects Hybrid low 1-2 clutch slip greater than 0 RPM for 10 seconds when commanded OFF.
Action Taken When the DTC Sets
DTC P07A3 is a Type B DTC.
Conditions for Clearing the DTC
DTC P07A3 is a Type B DTC.
Diagnostic Aids
When attempting to set transmission performance DTCs, 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
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views
Electrical Information Reference
* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs
* High Voltage Disabling
* High Voltage Enabling
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
* Scan Tool Output Controls (Scan Tool Output Controls)
* Scan Tool Data List (Scan Tool Data List)
* Scan Tool Data Definitions (Scan Tool Data Definitions)
Circuit/System Verification
1. Clear the DTC.
2. Operate the vehicle to induce a shift from 1st through 4th gear while observing the Low 1-2 Clutch Slip parameter. Stop the vehicle and turn the ignition OFF for 30 seconds. Perform this action 2 times. The Low 1-2 Clutch Slip parameter should display greater than 0 RPM when the Hybrid Low 1-2 Clutch Status parameter displays Released.
• If any other DTCs set, diagnose that DTC first.
• If the DTC P07A3 resets, go to Component Testing.
Component Testing
1. Perform the Line Pressure Check (Line Pressure Check) .
2. Inspect the trans fluid pump ball check valve for possible sticking or damage.
• If you found a concern with this check ball, repair the concern.
3. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test (Control Solenoid Valve and TCM Assembly Solenoid Performance Test) .
• If a concern is found, replace the control solenoid (w/body and TCM) valve assembly.
4. Inspect the hybrid low 1-2 clutch boost valve assembly for sticking or damage.
• If you found a concern with the hybrid direct 2-3-4 clutch regulator valve, repair or replace the valve or valve body.
5. Inspect the hybrid low 1-2 clutch for a stuck On or damaged condition.
• If you found a hybrid low 1-2 clutch concern, repair or replace the hybrid low 1-2 clutch assembly as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
* Control Module References - for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
* Hybrid low 1-2 clutch overhaul - for hybrid low 1-2 clutch repair or replacement.
* Control Valve Body Replacement (Control Valve Body Replacement) for lower valve body assembly replacement.
* Control Valve Upper Body Assembly Cleaning and Inspection - for valve body inspection, if the inspection procedure indicates to replace the valve body, refer to Control Valve Lower Body and Upper Body Replacement.