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 P0976: Shift Solenoid (SS) 2 Control Circuit Low VoltageDTC P0977: Shift Solenoid (SS) 2 Control Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Shift Solenoid (SS) 2 Control | P0976 | P0977 | P0977 | -- |
Shift Solenoid (SS) 2 High Side Driver 2 | P1833 | P1833 | P1834 | -- |
Typical Scan Tool Data
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK | |||
Shift Sol. 2 CKT Status | Short to GND | Open | Short to Voltage |
High Side Driver 2 CKT Status | Open/Short to GND | Open/Short to GND | Short to Voltage |
Circuit | Normal Circuit Voltage | Scan Data - Circuit Open | Scan Data - Circuit Grounded | Scan Data - Circuit Shorted to Voltage |
|---|---|---|---|---|
Shift Sol. 2 circuit Status | Operational | Open | Short to Ground | Shorted to Voltage |
High Side Driver 2 Circuit Status | Operational | Open/Short to GND | Open/Short to GND | Shorted to Voltage |
Circuit/System Description
The shift solenoid (SS) 2 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The TCM supplies 12 volts to SS 2 on the high side driver 2 circuit. The TCM controls the normally closed SS 2 on the SS 2 control circuit. The SS 2 controls the transmission fluid to the Mode-3 valve. In the ON position the 4-5-6 clutch is fed by drive fluid. In the OFF position, Reverse fluid is allowed to flow and is supplied to the low and reverse clutch and the 4-5-6 clutch assemblies.
Conditions for Running the DTC
P0976
| • | DTC P0976 is not set. |
| • | Start the ignition voltage, run the engine. |
P0977
| • | DTC P0977 is not set. |
| • | Start the ignition voltage, run the engine. |
Conditions for Setting the DTC
P0976
| • | The TCM detects an internal low voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded OFF for 300 milliseconds. |
| • | Last for 1.2 seconds in the 1.5 seconds sample time. |
P0977
| • | The TCM detects an internal high voltage electrical malfunction of the SS 2 control circuit when the SS 2 is commanded ON for 300 milliseconds. |
| • | Last for 1.2 seconds in the 1.5 seconds sample time. |
Action Taken When the DTC Sets
| • | DTC P0976 is a type B DTC. |
| • | The TCM defaults the transmission to 3rd gear if the current gear is 1st, 2nd, or 3rd, or 5th gear if the current gear is 4th, 5th, or 6th gear. |
| • | The TCM inhibits the torque converter clutch (TCC). |
| • | The TCM commands maximum line pressure. |
| • | The TCM freezes transmission adaptive functions. |
Conditions for Clearing the DIC/DTC
| • | DTC P0976 is a type B DTC. |
| • | DTC P0977 is a type A DTC. |
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd 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
Scan Tool Reference
Circuit/System Testing
- Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
- Operate the vehicle in 4th, 5th, or 6th gear with TCC applied, long enough to ensure at least a 3°C (5°F) rise in TCM substrate temperature.
- Observe the scan tool data parameter Shift Sol. 2 CKT Status. The parameter should display OK.
| ⇒ | If the parameter displays Open, Short to Volts, Short to GND, or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. |
| ⇒ | If no concerns are found during the inspection, 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 |
