DTC Advanced Diagnostics: P0797
DTC P0797:Pressure Control Solenoid Valve "C" Stuck ON (Engine Type: K24W1)

General Description

The CVT clutch pressure control solenoid valve controls hydraulic pressure to the forward clutch and the reverse brake. 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. To supply proper forward clutch/reverse brake hydraulic pressure, the powertrain control module (PCM) outputs a CVT clutch pressure control solenoid valve hydraulic pressure control signal. If the duration of the forward clutch/reverse brake engage operation from start to completion is short, the PCM detects a CVT clutch pressure control solenoid valve stuck ON failure and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status
Execution
Continuous
Sequence
None
Duration
Depending on the driving conditions
DTC Type
Two drive cycles, MIL off, A/T gear position indicator blinks
OBD Status
PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions
Condition
Minimum
Maximum
Engine speed
[ENGINE SPEED]
500 rpm
–
Vehicle speed
[VEHICLE SPEED]
–
1 mph (3 km/h)
Accelerator pedal position
–
0.6 °
Shift lever position
5-position continuously variable transmission
D, S
6-position continuously variable transmission
D, S, L
No active DTCs set (prevents monitor from running)
P0501, P0502, P0716, P0717, P0746, P0777, P0780, P0792, P0793, P0796, P0962, P0963, P0966, P0967, P0970, P0971, P1898, P1899
[ ]: HDS Parameter

Malfunction Threshold
Forward clutch engagement when shifted from N to D position takes less than 400 milliseconds.

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 stuck on

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
With the brake pedal pressed, place the shift lever from N to D, then shift to N, and wait for at least 2 seconds.
3.
Repeat Driving Pattern step 2, five times.
4.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
5.
Repeat Driving Pattern steps 1 through 3.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the A/T gear position indicator blinks and a Confirmed DTC and the freeze data are stored. 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.