P0753

Diagnostic Chart:

Description:

Circuit Description

The shift solenoid #1 is energized and de-energized by the Powertrain Control Module (PCM) m response to varying transaxle shift demands. With the shift solenoid #1 de-energized, line pressure is applied to the 2-3 shift valve. With line pressure applied, the 2-3 shift valve operates, and the transaxle shifts from second to third gear. When the PCM energizes the shift solenoid #1, line pressure is relieved, and the 2-3 shift valve does not operate.

Conditions for Setting the DTC

^ PCM does not see any voltage drop across shift solenoid #1 control circuit during attempted solenoid energization.

^ One driving cycle detection logic.

Action Taken When the DTC Sets

A DTC P0753 is stored and the Malfunction Indicator Lamp (MIL) is turned ON.

Diagnostic Aids

Check the following conditions:

^ Open or shorted shift solenoid #1.

^ Faulty electrical circuits (open or short to ground) between the shift solenoid #1 and the PCM.

^ Faulty PCM

An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.

Inspect the Powertrain Control Module (PCM) harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals and for poor terminal-to-wire connections.

If this DTC cannot be duplicated, the information included in the Freeze Frame data can be useful in determining vehicle operating conditions when the DTC was first set.

If any wiring repairs need to be made, refer to Repair Procedures in Electrical Diagrams.

DTC Confirmation Procedure

1. Turn ignition switch to LOCK.

2. Connect scan tool to Data Link Connector (DLC).

3. Turn igniti0n switch to ON.

4. Clear DTC, pending DTC and freeze frame data in PCM memory by using scan tool.

5. Start engine.

6. Step firmly on brake pedal.

7. Shift manual selector to Drive (D) range and keep it there for 10 seconds.

8. Accelerate vehicle in Drive (D) range and keep driving for 10 seconds at about 40 km/h (25 mph).

9. Stop vehicle.

10. Check for pending DTC with scan tool.

Test Description

Numbers below refer to circled numbers on the diagnostic chart.

1. The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.

2. Checks shift solenoid internal coil resistance.

3. Checks for a short to ground in the shift solenoid #1 control circuit.

4. Checks for an open in the shift solenoid #1 control circuit.

5. Checks the condition of the transaxle internal electrical harness for damage.

6. Checks for a short to voltage in the shift solenoid #1 control circuit.

7. Checks for a poor electrical connection that may have caused DTC to set.

8. Checks for a faulty PCM.