P0756

Diagnostic Chart:

Diagnostic Chart (cont'd):

Wiring Diagram:

2nd clutch is applied when circuit 1222 is opened at the PCM. When the PCM opens the circuit, the voltage is monitored at terminal J4A07 to check for proper circuit conditions.

DTC PARAMETERS

DTC P0756 is set when the PCM has detected the following condition twice per ignition cycle.

^ Voltage monitored at terminal J4A07 (circuit 1222) is less than 2 - 2.5 volts when the 2nd gear actuator is switched off 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 TRS 2/TCC fuse is ok, check for battery voltage on fuel pump relay side of fuse with engine running.

3. This step checks for a ground in circuit 1526. A ground in circuit 1526 will cause the TRS 2 fuse to fail and set DTC P0756.

4. An open in circuit 1526 will cause DTC P0756 to set. Check circuit 1526 for opens.

5. This step determines if fault is in the circuit to the PCM or in the actuator or connector plate.

6. This step will determine if fault is in the actuator or connector plate.

7. An open or a ground in circuit 1222 will set DTC P0756. This step checks circuit 1222 for opens or grounds.

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.

^ This DTC may set or intermittent 2nd gear starts may be caused by a poor electrical connection at either the PCM, actuator connector plate or Under Hood Junction Block (UHJB) terminals. Wiggling connectors while performing an actuator quick test may help isolate the problem area.

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

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

^ An open circuit will result in 2nd gear to be stuck on while grounded circuit will result in no 2nd gear and will probably also result in DTC P0741 - No TCC.