Tester Installation Procedures

Installing the Rotunda Transmission Tester 007-00130 and Rotunda AX4N Cable and Overlay 418-FO42 (007-00117) or equivalent at the transaxle connector allows the separation of the transaxle electronics from the vehicle electronics.

Testing may cause additional Diagnostic Trouble Codes (DTCs) to be set. Therefore, it is important that you erase all DTCs whenever you make repairs. To verify elimination of all DTCs, rerun On-Board Diagnostics (OBD).

Also, disconnecting the normal vehicle electronics causes firm shifts and defaults the transaxle to maximum line pressure.

CAUTION: To properly diagnose an AX4N transaxle, the Rotunda Transmission Tester 007-00130 or equivalent must have been updated for AX4N compatibility. the Rotunda AX4N Transmission Tester Update 007-00105 or equivalent includes 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.

1. If the vehicle has heat shields, remove them. Always replace them after service.
2. Disconnect vehicle harness at transaxle connector.

CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transaxle concern.

3. Attach the appropriate overlay to the transmission tester.





4. Turn the SOLENOID SELECT dial to OHMS CHECK position.

CAUTION: For resistance checks be sure that the SOLENOID SELECT dial is set to the OHMS CHECK position, or damage to the ohmmeter could result.

5. Connect the appropriate interface cable to the tester and then to the transaxle connector.

CAUTION: Route all cables away from heat sources to prevent damage to cables during testing.

6. Install a 0-2500 kPa (0-300 psi) line pressure gauge into line pressure tap on case.