DTC Advanced Diagnostics: P0966
DTC P0966 : CVT Driven Pulley Pressure Control Solenoid Valve Circuit Low
General Description
The CVT driven pulley pressure control solenoid valve controls hydraulic pressure to the driven pulley. The CVT driven pulley pressure control solenoid valve is controlled by duty cycle output. The spool in the CVT driven pulley pressure control solenoid valve moves the valve according to the current, and produces hydraulic pressure in proportion to the current. The transmission control module (TCM) measures the current that passes through the CVT driven pulley pressure control solenoid valve and uses feedback control to compensate for the difference between the measured current and the commanded one. The failure occurs by an open circuit or an intermittent open circuit. If the TCM internal driver IC detects its abnormal or the measured current is not equal to the duty cycle command, the TCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or more |
| DTC Type | One drive cycle, MIL on, Shift position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery Voltage] | 10.0 V | - |
[ ]: HDS Parameter
Malfunction Threshold
One of the conditions is met for at least 1 second:
- TCM internal driver IC detects its abnormal.
- The measured current for the TCM's command value is as specified here.
| Duty (%) | Current (A) | Failure mode |
|---|---|---|
| 56.5 - 90.2 | Less than 0.19 | Low Input |
| More than 90.2 | Less than 0.27 | Low Input |
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- CVT driven pulley pressure control solenoid valve DNLS line open (includes a loose or disconnected connector)
- CVT driven pulley pressure control solenoid valve DNC- line open (includes a loose or disconnected connector)
- CVT driven pulley pressure control solenoid valve internal circuit open
- TCM internal circuit failure
Confirmation Procedure
Operating Condition
Start the engine, and wait for at least 1 second.
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.
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.