FOREWORD[MULTIPLEX COMMUNICATION SYSTEM (AJ (3.0L Duratec))]


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1.  Verify the customer concern.

2.  Perform visual inspection for obvious electrical malfunction.

Visual Inspection Chart

Electrical malfunction

•  Central junction box (CJB) fuse
•  Wiring harness
•  Connector
•  Instrument cluster
•  ABS HU/CM
•  SAS control module
•  Generic electronic module (GEM)
•  PCM

3.  If the malfunction is still present after the inspection, connect the M-MDS to the DLC-2, then perform the network test. If the M-MDS does not communicate with the vehicle, go to “No.8 MODULE/NETWORK DOES NOT ESTABLISH COMMUNICATION—POWER IS NOT SUPPLIED TO M-MDS.”

4.  Go to the “Symptom Troubleshooting Chart.”