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 P07A9: Transmission Friction Element 4 Stuck OnTypical Scan Tool Data
Parameter | Commanded ON | Commanded OFF | Stuck/Welded When Commanded OFF |
|---|---|---|---|
Operating Conditions: Vehicle Speed 0-50 MPH Parameter Normal Range: 0-6,000 RPM | |||
Clutch 4 Slip Speed | 0 RPM | 0-6,000 RPM | 0 RPM |
Clutch 4 Status | Applied | Released | Released |
Circuit/System Description
The hybrid powertrain control module (HPCM) monitors the Clutch Slip for each Hybrid Trans. Mode Commanded state. This DTC detects no clutch slip when the 1-3 clutch is commanded OFF, indicating a stuck or welded clutch condition.
Conditions for Running the DTC
| • | The 1-3 clutch is the primary off-going clutch. |
| • | The Hybrid Trans. Mode Commanded is not gear 1 or gear 3. |
| • | The Calc. Trans Input Speed is greater than 250 RPM. |
Conditions for Setting the DTC
Fail Case 1
The 1-3 clutch is commanded OFF for 3 seconds and the HPCM detects the 1-3 clutch slip speed is less than 100 RPM for 0.25 seconds, when commanded OFF in EVT 1 mode.
Fail Case 2
The 1-3 clutch is commanded OFF for 3 seconds and the HPCM detects the 1-3 clutch slip speed is less than 80 RPM for 0.25 seconds, when commanded OFF in EVT 2 mode.
Action Taken When the DTC Sets
P07A9 is a Type B DTC.
Conditions for Clearing the DTC
P07A9 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
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
- Clear the DTC.
- Operate the vehicle from EVT 1 through 4th gear while observing the 1-3 Clutch Slip parameter. Stop the vehicle and turn the ignition OFF for 30 seconds. Perform this action 2 times. The 1-3 Clutch Slip parameter display should be greater than 0 RPM when the 1-3 Clutch Status parameter displays Released.
| ⇒ | If any other transmission DTCs are set, diagnose those first. |
| ⇒ | If the DTC P07A9 resets, go to Component Testing. |
Component Testing
- Perform the Line Pressure Check.
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.
- Inspect the hybrid low, 1-2 clutch boost valve assembly, for sticking or damage.
- Inspect the 1-3 clutch assembly for a stuck ON or damaged condition.
| ⇒ | If you found a concern, repair the concern. |
| ⇒ | If a concern is found, replace the control solenoid (w/body and TCM) valve assembly. |
| ⇒ | If you found a concern with the hybrid low, 1-2 clutch boost valve assembly, repair or replace the valve or valve body. |
| ⇒ | If you found a 1-3 clutch assembly concern, repair or replace the 1-3 clutch assembly as necessary. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | 1-3 Clutch Housing Overhaul for 1-3 clutch assembly, replacement or repair. |
| • | Control Valve Lower Body and Upper Body Replacement for lower valve body assembly repair or replacement. |
| • | Perform the valve body inspection procedure, refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection. If the inspection procedure indicates to replace the valve body, refer to Control Valve Lower Body and Upper Body Replacement. |
| • | Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming. |
