Important Information

PERFORM ON-BOARD DIAGNOSTICS
After a road test, with the vehicle warm and before disturbing any connectors, perform the Quick Test using Rotunda New Generation Star Tester 007-00500 or equivalent.

DIAGNOSTICS
Diagnosing an electronically controlled automatic transaxle is simplified by using the following procedures. One of the most important things to remember is that there is a definite procedure to follow. DO NOT TAKE SHORT CUTS OR ASSUME THAT CRITICAL CHECKS OR ADJUSTMENTS HAVE ALREADY BEEN MADE. Follow the procedures as written to avoid missing critical components or steps. By following the diagnostic sequence, the service technician will be able to diagnose and repair the concern the first time.

ON-BOARD DIAGNOSTICS WITH NGS
These tests can be used to diagnose the Powertrain control module (PCM), sensors and actuators of the AX4S transaxle.

The following is a guide for using the On-Board Diagnostic (OBD) Quick Tests and the Rotunda New Generation Star Tester (NGS) 007-00500 or equivalent, with some special considerations to remember:

NOTE: For detailed instructions and other diagnostic methods using the NGS, refer to NGS instruction guide.

OTHER NGS FEATURES
For further information on other diagnostic testing features using the NGS or generic scan tool.
Other diagnostic methods include the following:
- Parameter Identification (PID) Access Mode, used to monitor sensors and actuators.
- Freeze Frame Data Access Mode, used to view emission related data values from specific PIDs.
- Oxygen Sensor Monitor Mode, used to monitor the O2 sensor.

AFTER ON-BOARD DIAGNOSTICS

NOTE: The vehicle wiring harness, powertrain control module and non-transaxle sensors may affect transaxle operations. Service these concerns first.

After the On-Board Diagnostic procedures are completed, service all DTCs.

Begin with non-transaxle related DTCs, then service any transaxle-related DTCs. Refer to the On-Board Diagnostic Trouble Code Description Chart for information on condition and symptoms. This chart will be helpful in referring to the proper procedures and to aid in diagnosing internal transaxle concerns and external non-transaxle inputs. The pinpoint tests are used in diagnosing electrical concerns of the AX4S transaxle. Make sure that the vehicle wiring harness and the Powertrain Control Module (PCM) are diagnosed as well. The Powertrain Management diagnostic procedures will aid in diagnosing non-transaxle electronic components. The diagnostic routine hydraulic/mechanical charts will help in diagnosing internal transaxle concerns and external non-transaxle inputs.

BEFORE PINPOINT TESTS
If DTCs appear while performing the self-test, refer to the On-Board Diagnostic Trouble Code Description Chart for the appropriate service procedure.

NOTE:
- Prior to entering pinpoint tests, refer to the TSBs for concerns.
- Prior to entering pinpoint tests, the vehicle harness must be checked for continuity and shorts and the powertrain control module (PCM) must be checked for any concerns.
- If any non-transaxle DTCs appear, service those DTCs first. They could affect the electrical operation of the transaxle. Record and erase codes from continuous memory after repairs have been performed. After servicing any DTCs in the Quick Test, the Quick Test should be repeated.
- Check the PCM system wiring harness for proper connection, bent or broken pins, corrosion, loose wires, proper routing, proper seals and their condition. Check the PCM sensors and actuators for physical damage.