DTC Advanced Diagnostics: P0971
DTC P0971:Pressure Control Solenoid "C" Control Circuit High (Engine Type: K24W1)

General Description


The CVT clutch pressure control solenoid valve controls and optimizes clutch pressure (hydraulic pressure) for various driving conditions. The CVT clutch pressure control solenoid valve is controlled by duty cycle output. The spool in the CVT clutch pressure control solenoid valve moves the valve according to the current, and produces hydraulic pressure in proportion to the current. The powertrain control module (PCM) measures the current that passes through the CVT clutch pressure control solenoid valve and uses feedback control to compensate for the difference between the measured current and the commanded one. If the measured current is not equal to the duty cycle command, the PCM detects a malfunction (open, short to ground) 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]
10.0 V
–
No active DTCs set (prevents monitor from running)
P0716, P0717, P0746, P0777, P0780, P0792, P0793, P0796, P0962, P0963, P0966, P0967, P0970, P1898, P1899
[ ]: HDS Parameter

Malfunction Threshold
The measured current for the PCM’s command value is as specified here for at least 1 second.

Duty (%)
Current (A)
Failure mode
Less than 14.0
More than 0.57
High Input
14.1 - 28.0
More than 0.89
High Input

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.
CVT clutch pressure control solenoid valve internal circuit short
PCM GND1 line open
PCM GND2 line open
PCM internal circuit failure

Confirmation Procedure
Operating Condition
Start the engine, 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 turning the ignition switch to LOCK (0), or 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.