DTC Advanced Diagnostics: P2721
DTC P2721:Pressure Control Solenoid "D" Control Circuit High (Engine Type: K24W1)

General Description


The CVT lock-up clutch control solenoid valve controls hydraulic pressure to the torque converter clutch. The CVT lock-up clutch control solenoid valve is controlled by duty cycle output. The spool in the CVT lock-up clutch 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 lock-up clutch 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 (CVT lock-up clutch control solenoid valve failure, PCM failure) 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, P0977, P1898, P1899, P2720
[ ]: 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 lock-up clutch 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 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.