Before Pinpoint Tests

DESCRIPTION
The following items must be checked prior to beginning the diagnostic procedures.

KNOW/UNDERSTAND THE CONCERN
In order to properly diagnose a concern you must first understand the customer complaint or condition. Customer contact may be required in order for the technician to begin to verify the concern. You must understand the conditions as to when the concern occurs. For example:
- hot or cold vehicle temperature.
- hot or cold ambient temperature.
- vehicle driving conditions. After understanding when and how the concern occurs, proceed to verifying the condition.

REQUIRED EQUIPMENT

CAUTION: To properly diagnose an AX4N transaxle, the Rotunda Transmission Tester (007-00130) or equivalent MUST have been updated for AX4N compatibility. This update includes internal software and related components and a new cable and overlay. Inspect your tester for the AX4N Compatible label located near the tester's cable connector. If the label is missing, do not use the tester to diagnose the AX4N transaxle. Contact Rotunda Equipment or supplier as listed in instruction manual for information on how to have the tester updated.

- Rotunda Transmission Tester 007-00130
- Rotunda AX4N Transmission Tester Update 007-00105
- Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent
- Rotunda 73 Digital Multimeter 105-R0051 or equivalent
- Rotunda Transmission Range (TR) Sensor Cable MLP-B007-00127, used with Transmission Tester 007-00130
- Rotunda 104-Pin Breakout Box 014-00950 or equivalent
- Transmission Range (TR) Sensor Alignment Tool (MLPS Alignment Tool) T92P-70010-AH

VERIFICATION OF CONDITION
This section provides information which must be used in both determining the actual cause of customer concerns and performing the appropriate service procedures.

NOTE: Some transaxle conditions may cause engine concerns. An EPC short circuit may cause alternate firing. The torque converter clutch not disengaging will stall the engine. The following procedures must be used when verifying customer concerns for transaxle:

1. Determine Customer Concern
- hot or cold vehicle operating temperature
- hot or cold ambient temperatures
- type of terrain
- vehicle loaded/unloaded
- city/highway driving
- Upshift
- Downshift
- Coasting
- Engagement
- Noise/Vibration
2. Check Fluid Level and Condition Testing and Inspection
3. Perform the Road Test procedure.
4. After a road test, with the vehicle warm and before disturbing any connectors, perform the Quick Test 2.0 using Rotunda New Generation Star Tester 007-00500 or equivalent.
5. Check for updates, such as technical service bulletins (TSB's).

- If DTCs appear while performing the self-test, refer to the On-Board Diagnostic Trouble Code Description Chart for the appropriate service procedure.
- Prior to entering pinpoint tests, refer to the TSB's and OASIS messages for AX4N concerns.
- Prior to entering pinpoint tests, the vehicle harness must be checked for continuity and shorts and the PCM must be checked for any concerns. Refer to Powertrain Managements for proper procedures.
- If any non-transaxle DTCs appear, service those DTCs first. They could affect the electrical operation of the transaxle. Record all transaxle 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.