• | 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. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Shift Solenoid (SS) 1 Control | P0973 | P0974 | P0974 | -- |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK | |||
Shift Sol. 1 CKT Status | Short to GND | Open | Short to Volts |
The shift solenoid (SS) 1 is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The control solenoid (w/body and TCM) valve assembly supplies 12 volts to SS 1 on the high side driver 1 circuit. The control solenoid (w/body and TCM) valve assembly controls the normally closed SS 1 on the SS 1 control circuit. The SS 1 controls the transmission fluid to the hybrid low, 1-2 clutch boost valve assembly.
In the OFF position, SS 1 controls the transmission fluid to the following components:
• | EVT 1 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid low, 1-2 clutch |
• | EVT 2 mode, oil is supplied to drive motors with generator 1 and 2 for cooling and the hybrid direct 2-3-4 clutch |
In the ON position, SS 1 controls the transmission fluid to the following components:
• | Gear 1, oil is supplied to the hybrid low, 1-2 clutch and the 1-3 clutch |
• | Gear 2, oil is supplied to the hybrid low, 1-2 clutch and the hybrid direct 2-3-4 clutch |
• | Gear 3, oil is supplied to the hybrid direct 2-3-4 clutch and the 1-3 clutch |
• | Gear 4, oil is supplied to the hybrid direct 2-3-4 clutch and the 4th clutch |
• | The engine run time is greater than 5 seconds. |
• | The vehicle speed is less than 200 km/h (124 mph) for 5 seconds. |
• | The system voltage is 11-18 volts. |
The control solenoid (w/body and TCM) valve assembly detects an internal low voltage electrical malfunction of the SS 1 control circuit when SS 1 is commanded OFF for 1 second.
The control solenoid (w/body and TCM) valve assembly detects an internal high voltage electrical malfunction of the SS 1 control circuit when SS 1 is commanded ON for 1 second.
• | DTCs P0973 and P0974 are Type A DTCs. |
• | The TCM defaults the transmission to EVT 1 or EVT 2 depending on vehicle speed. |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
DTCs P0973 and P0974 are Type A DTCs.
When attempting to set solenoid electrical DTCs, ensure the control solenoid (w/body and TCM) valve assembly is warmed up and the transmission is operated long enough to ensure a 3°C (5°F) increase in TCM temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.
Automatic Transmission Controls Schematics
• | Circuit Testing |
• | Wiring Repairs |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information.
⇒ | 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. |
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.