P0746

Diagnostic Chart:

Schematic:

The Pressure Control (PC) solenoid is used to control main line pressure to the transaxle hydraulic system . The PCM Pulse Width Modulates (PWM) the PC solenoid whenever the engine is running. The PCM controls the PC solenoid by pulse width modulating an internal driver that pulls the solenoid circuit to ground. When the PC solenoid is commanded Off, main line pressure is highest. During normal shift operation, the PCM will turn On or Off the 2, 3 or 4 shift solenoids and PWM the PC solenoid to prevent clutch Slip and harsh shifts. The PC solenoid circuit is monitored for low and high voltage faults. DTC P0746 sets when the PC solenoid is commanded Off (or PWM Off-time) and the feedback voltage at the PCM is low.

DTC PARAMETERS
DTC P0746 will set if PC solenoid voltage is less than 1.25 volts when PC solenoid is being commanded Off. Condition must exist twice in one ignition cycle.

DTC P0746 diagnostic runs continuously with engine running.

DTC P0746 is a type D DTC.

DIAGNOSTIC AIDS
To locate an intermittent problem, use Scan tool to command TRANS. SOLENOID POWER On, while monitoring the PC SOLENOID - LOW VOLT or PC SOLENOID - OPEN test. When a fault (open or short to ground) exists, the Scan tool will display TEST FAIL for both tests.

The tests will fail only when the device is being commanded Off and the voltage at the PCM is low. The tests update every 100 ms whenever the ignition is turned On and the device is being commanded Off via the Scan tool or PCM.

PC solenoid resistance: 3.8-7.2 ohms

Nominal value: 4.5 ohms at 68°F