DTC P0974
DTC P0974: Shift Solenoid Valve A (Open)
General Description
| Capacity of Over Drive Clutch | Shift Solenoid Valve A | ||
| ON (12 V) | OFF (0 V) | ||
| Shift Solenoid Valve B | ON (12 V) | ON | OFF |
| OFF (0 V) | OFF | OFF | |
When shift solenoid valves A and B are turned ON, 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 detects 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
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or more |
| DTC Type | One drive cycle, MIL off, shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [BATTERY VOLTAGE] | 11 V | - |
[ ]: HDS Parameter
Malfunction Threshold
The return signal does not match the command to turn OFF shift solenoid valve A for at least 1 second.
Possible Cause
- Shift solenoid valve A SHA line open (includes a loose or disconnected connector)
- Shift solenoid valve A internal circuit open
- PCM internal failure
Confirmation Procedure
Operating Condition
- Turn the vehicle to the READY TO DRIVE mode.
- With the brake pedal pressed, shift to P, and wait for at least 1 second.
With the HDS
None.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the shift position indicator blinks and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.