P0747

Diagnostic Chart:

Wiring Diagram:

During normal driving modes the PCM/TC adapts line pressure to prevent clutch slip and harsh shifts. This is accomplished by modulating the pressure control solenoid ground (1530) to raise or lower pressure. Open circuit = high pressure, grounded circuit = low pressure. When the PCM opens the circuit the voltage is monitored at terminal J4A03 to check for proper circuit conditions.

DTC PARAMETERS
DTC P0747 is set when the PCM has detected voltage monitored at terminal J4A03 (circuit 1530) is greater than 2 - 2.5 volts when the pressure control solenoid is switched On electrically by the PCM, twice per ignition cycle.

TEST DESCRIPTION
Numbered steps below refer to numbered steps on chart.
1. This step verifies problem is still present.
2. If the pressure control solenoid, connector plate, or circuit 1530 is shorted, DTC P0747 will set. This step will break down the circuit down to find the source of the short.
3. If circuit 1530 is shorted to voltage, DTC P0747 will set. This step checks circuit 1530 for a short to voltage.
4. This step will determine if it is the pressure control solenoid or the solenoid connector plate that is shorted. A solenoid is shorted internally when its resistance is one or more ohms lower than the average resistance of the other solenoids at the same temperature.

REPAIR VERIFICATION
Monitor DTC menu "Code Status" for "Pass Since Code Clear" and "Pass This Ignition Cycle." When both have passed, repair is verified.

Criteria for pass:
- Engine running
- Power present at solenoids and no active faults exist for this solenoid.

DIAGNOSTIC AIDS
When the PCM detects a fault in the circuit (open, ground, short) the PCM will open the circuit internally to protect the circuit.

No 2nd, 3rd, 4th gear 732, 733, 734 DTCs set if circuit is shorted (will not shift out of 1st).