Diagnostic Procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DIAGNOSTIC PROCEDURE

Step	Inspection		Action
1	INSPECT COIL ANTENNA CONNECTOR CONDITION Switch the ignition to off Disconnect the negative battery cable Disconnect the coil antenna connector Inspect the connector and terminals (corrosion, damage, pin disconnection) Is there any malfunction?	Yes	Repair or replace the connector or terminals, then go to the next step
1		No	Go to the next step
2	PERFORM DTC INSPECTION Reconnect the disconnected connectors Reconnect the negative battery cable Clear the DTC from the instrument cluster and PCM memory using the M-MDS See CLEARING DTC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] ) Perform the immobilizer system (keyless entry system) DTC inspection using the M-MDS See DTC INSPECTION [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] ) Is the same DTC present?	Yes	Replace the coil antenna, then go to the next step. See COIL ANTENNA REMOVAL/INSTALLATION [KEYLESS ENTRY SYSTEM] .
2		No	Go to Step 5.
3	PERFORM DTC INSPECTION Clear the DTC from the instrument cluster and PCM memory using the M-MDS See CLEARING DTC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] ) Perform the immobilizer system (keyless entry system) DTC inspection using the M-MDS See DTC INSPECTION [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] ) Is the same DTC present?	Yes	Replace the PCM and program the immobilizer system-related parts, then go to the next step. See PCM REMOVAL/INSTALLATION [L5] . See PCM REMOVAL/INSTALLATION [MZI-3.7] . See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [KEYLESS ENTRY SYSTEM] .
3		No	Go to Step 5
4	VERIFY TROUBLESHOOTING COMPLETED Clear the DTC from the instrument cluster and PCM memory using the M-MDS See CLEARING DTC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] . Perform the immobilizer system (keyless entry system) DTC inspection using the M-MDS See DTC INSPECTION [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] ) Is the same DTC present?	Yes	Replace the instrument cluster and program the immobilizer system-related parts, then go to the next step See INSTRUMENT CLUSTER REMOVAL/INSTALLATION . See IMMOBILIZER SYSTEM-RELATED PARTS PROGRAMMING [KEYLESS ENTRY SYSTEM] .
4		No	Go to the next step
5	VERIFY THAT NO OTHER DTCs ARE PRESENT Are any DTCs present?	Yes	Go to the applicable DTC inspection. See DTC TABLE [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)] )
5		No	DTC troubleshooting completed.