DTC Advanced Diagnostics: P0796
DTC P0796:Pressure Control Solenoid Valve C Performance or Stuck OFF

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 oil pressure, the powertrain control module (PCM) outputs a CVT clutch pressure control solenoid valve oil pressure control signal. If the torque converter turbine speed and drive pulley speed does not match when forward clutch/reverse brake is engaged at a specified vehicle speed condition, the PCM detects a CVT clutch pressure control solenoid valve stuck OFF failure and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
30 seconds or less
DTC Type
Two drive cycles, MIL on, Shift position indicator blinks

Enable Conditions
Condition
Minimum
Maximum
Engine speed
[ENGINE SPEED]
500 rpm
–
Forward clutch/reverse brake commanded pressure
206 kPa (2.1 kgf/cm2, 29.9 psi)
–
Vehicle speed
[VEHICLE SPEED]
–
1 mph (3 km/h)
Shift lever position/mode
D, S, L, R
[ ]: HDS Parameter

Malfunction Threshold
The rotation speed between the torque converter turbine speed [Torque Converter Turbine Speed] and the drive pulley speed [Input Shaft (Drive Pulley) Speed rpm] is 250 rpm or more.

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 off

Confirmation Procedure
Operating Condition
1.
Start the engine.
2.
With the brake pedal pressed, place the shift lever from N to D position/mode, and wait for at least 30 seconds.
3.
Turn the vehicle to the OFF (LOCK) mode.
4.
Repeat Driving Pattern steps 1 through 2.
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 MIL comes on, the shift position indicator blinks, and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The shift position indicator comes off by turning the vehicle to the OFF (LOCK) 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 or by disconnecting the 12 volt battery.