DTC Advanced Diagnostics: P0977
DTC P0977:Shift Solenoid Valve "B" Circuit High (Engine Type: K24W1)

General Description

Torque converter clutch status by shift solenoid valve B output
Torque Converter Clutch
Shift Solenoid Valve B
OFF
OFF
ON
ON

Shift solenoid valve B controls the drain circuit close/open commanded by the powertrain control module (PCM) ON/OFF commands. Fluid passages which supply/discharge the hydraulic pressure to torque converter clutch is switched by shift solenoid valve B ON/OFF control. The PCM commands the driver circuit to turn on shift solenoid valve B. 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 shift solenoid valve B, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
1 second or more
DTC Type
One drive cycle, MIL off, A/T gear position indicator blinks
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Battery voltage
[BATTERY VOLTAGE]
10.0 V
–
No active DTCs set (prevents monitor from running)
P0716, P0717, P0741, P0746, P0777, P0780, P0792, P0793, P0796, P0797, P0962, P0963, P0966, P0967, P0970, P0971, P0976, P1898, P1899, P2715, P2720, P2721
[ ]: HDS Parameter

Malfunction Threshold
The return signal does not match the command to turn OFF shift solenoid valve B [SHIFT SOL B] for at least 1 second.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Shift solenoid valve B SOL B line open (includes connector loose connection or disconnection)
Shift solenoid valve B internal circuit open
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
Shift to P, and wait for at least 10 seconds.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the A/T gear 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 A/T gear position indicator comes off by turning the ignition switch to LOCK (0), or pressing the engine start/stop button to select the OFF mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.