Advanced Diagnostics

Advanced Diagnostics - DTC P0974: Open in Shift Solenoid Valve A Circuit






Shift solenoid valve driving signal combination table






General Description
When shift solenoid valves A and D are turned ON, or when shift solenoid valves B and C are turned OFF, the hydraulic pressure circuit opens. The hydraulic pressure circuit supplies/discharges hydraulic pressure to/from each clutch according to the combination of the ON/OFF status of the shift solenoid valves. The powertrain control module (PCM) commands the driver circuit to turn on the shift solenoid valve. The circuit diagnoses malfunctions such as a circuit short or open, and sends back a return signal during the PCM's command. When the return signal does not match the PCM command to turn OFF the shift solenoid valve, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status






Enable Conditions






Malfunction Threshold
The return signal does not match the command to turn ON shift solenoid valve A for at least 1 second.

Driving Pattern
1. Start the engine.
2. With the brake pedal pressed, shift to R, and wait for at least 1 second.

Diagnosis Details

Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.