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 transaxle fluid pressure (TFP) actuator 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 the following condition twice per ignition cycle.

- Voltage monitored at terminal J4A03 (circuit 1530) is greater than 2 - 2.5 volts when the TFP actuator is switched on electrically by the PCM.

TEST DESCRIPTION

Numbered steps below refer to numbered steps on chart.

1. This step verifies problem is still present.

2. If the TFP actuator, 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 TFP actuator or the actuator connector plate that is shorted. An actuator is shorted internally when its resistance is one or more ohms lower than the average resistance of the other actuators 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 actuators and no active faults exist for this actuator.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem use the Scan tool* to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

* Select MALF History and DTC status from DTC menu of Scan tool.

Check the tightness of the female terminal grip with a spare male terminal.

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).