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 P2719: Clutch Pressure Control (PC) Solenoid 4 System PerformanceDTC P2720: Clutch Pressure Control (PC) Solenoid 4 Control Circuit Low Voltage
DTC P2721: Clutch Pressure Control (PC) Solenoid 4 Control Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Clutch PC Solenoid 4 Control | P2720 | P2721 | P2721 | P2719 |
Clutch PC Solenoid 4 High Side Driver 2 | P1833 | P1833 | P1834 | P2719 |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Clutch PC 4 Sol. CKT Status | Operational | Open/Short to Voltatge | Short to Ground | Open/Short to Voltage |
High Side Driver 2 CKT Status | Operational | Open/Short to GND | Open/Short to GND | Short to Voltage |
Circuit/System Description
The clutch pressure control (PC) solenoid 4 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM supplies 12 volts to the clutch PC solenoid 4 through the high side driver 2 circuit. The TCM control the clutch PC solenoid 4 through the clutch PC solenoid 4 control circuit. The normally low clutch PC solenoid 4 flows fluid to the 2-6 clutch when commanded ON and exhausts fluid when commanded OFF. The clutch PC solenoid 4 regulates the transmission fluid pressure to the 2-6 clutch.
Conditions for Running the DTC
P2719
Start the ignition voltage, run the engine.
P2720
| • | DTC P2720 is not set. |
| • | Start the ignition voltage, run the engine. |
P2721
| • | DTC P2721 is not set. |
| • | Start the ignition voltage, run the engine. |
Conditions for Setting the DTC
P2719
The TCM detects an internal electrical performance malfunction of the clutch PC solenoid 4 control circuit and the actual 2-6 clutch pressure does not equal the commanded 2-6 clutch pressure for 4.4 seconds in the 5 seconds sample time.
P2720
The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid 4 control circuit for 300 milliseconds in the 375 milliseconds sample time.
P2721
The TCM detects an internal low voltage electrical malfunction of the clutch PC solenoid 4 control circuit for 300 milliseconds in the 375 milliseconds sample time.
Action Taken When the DTC Sets
| • | DTC P2719 is a type C DTC. |
| • | DTC P2720 and P2721 is a type A DTC. |
| • | The TCM defaults the transmission to a limited shift pattern, 2 forward gears and reverse, based on the fault detected. |
| • | The TCM commands maximum line pressure. |
| • | The TCM freezes transmission adaptive functions. |
Conditions for Clearing the DTC
| • | DTC P2719 is a Type C DTC. |
| • | DTCs P2720 and P2721 are Type A DTCs. |
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in second gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
DTC Type Reference
Electrical Information Reference
Circuit Verification
Perform the following procedure to place the control solenoid (w/body and TCM) valve assembly under the optimal conditions to test solenoid electrical DTCs.
- Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
- Operate the vehicle in second gear long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature.
Component Testing
The scan tool data parameter Clutch PC 4 Sol. CKT Status normally displays OK.
| ⇒ | If the parameter displays Open/Short to Volts or Short to GND or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection and if no concerns are found, replace the control solenoid (w/body and TCM) valve assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for TCM replacement, setup, and programming |
