DTC Advanced Diagnostics: P0977
DTC P0977:Shift Solenoid Valve B (Open) (Engine Type: J35Y1)

General Description

Hydraulic pressure supply to the clutch by shift solenoid valve output (D position)
Gear position
Shift solenoid valve
Clutch
A
B
1st
2nd
3rd
4th
5th
6th
Neutral-1st
ON
OFF
CPCD
–
–
–
–
–
1st
ON
ON
LINE
CPCA
CPCB
CPCC
–
–
1st-2nd
ON
ON
LINE
CPCA
CPCB
CPCC
–
–
2nd
ON
ON
LINE
CPCA
CPCB
CPCC
–
–
2nd-3rd
ON
ON
LINE
CPCA
CPCB
CPCC
–
–
3rd
OFF
ON
LINE
–
CPCB
CPCC
CPCA
–
3rd-4th
OFF
ON
LINE
–
CPCB
CPCC
CPCA
–
4th
OFF
OFF/(ON)
LINE
–
(CPCB)
CPCC
CPCA
CPCB
4th-5th
OFF
OFF
LINE
–
–
CPCC
CPCA
CPCB
5th
OFF
OFF/(ON)
LINE
–
(CPCB)
CPCC
CPCA
CPCB
5th-6th
OFF
OFF
LINE
–
–
CPCC
CPCA
CPCB
6th
OFF
OFF
LINE
–
–
CPCC
CPCA
CPCB
LINE: Line pressure

CPCA: A/T clutch pressure control solenoid valve A pressure

CPCB: A/T clutch pressure control solenoid valve B pressure

CPCC: A/T clutch pressure control solenoid valve C pressure

CPCD: A/T clutch pressure control solenoid valve D pressure

When shift solenoid valves A, B, and C 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, OBD Status
Execution
Continuous
Sequence
None
Duration
1 second or more
DTC Type
One drive cycle, MIL on, A/T gear position indicator blinks
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Battery voltage
[BATTERY VOLTAGE]
11 V
–
No active DTCs set (prevents monitor from running)
P0966, P0967, P0970, P0971, P0976
[ ]: HDS Parameter

Malfunction Threshold
The return signal does not match the command to turn OFF shift solenoid valve B [A/T SHIFT SOL VLV. 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 SHB line open (includes connector loose connection or disconnection)
Shift solenoid valve B internal circuit open
Shift solenoid valve B power supply line open
Shift solenoid valve B power supply line short to ground
PCM internal circuit failure

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
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 MIL comes on, the A/T gear position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory.

Conditions for clearing the DTC
The A/T gear position indicator comes off by pressing the engine start/stop button to select the OFF mode. 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.