Attachment III-A Post-Recall Service Code Diagnostic

ATTACHMENT III-A
EMISSIONS RECALL 91E05


IMPORTANT ELECTRONIC ENGINE CONTROL (EEC) POST-RECALL SERVICE CODE DIAGNOSTIC INFORMATION


THE SERVICE PROVIDED BY THIS RECALL MAY CAUSE ELECTRONIC ENGINE CONTROL (EEC) CODES TO OCCUR WHEN NO FAULT IS PRESENT. PLEASE BE FAMILIAR WITH THE FOLLOWING INFORMATION.


THE ADDITION OF THE VACUUM RETARD DELAY VALVE (VRDV) IN THE THERMACTOR AIR CONTROL SYSTEM MAY GENERATE A KEY-ON-ENGINE-OFF OR CONTINUOUS MODE SERVICE CODE 41 (SYSTEM LEAN) OR A KEY-ON-ENGINE-RUNNING SERVICE CODE 45 (THERMACTOR AIR UPSTREAM DURING SELF-TEST) WHEN AN EEC SYSTEM SELF-TEST IS PERFORMED. DIAGNOSE THESE CODES AS FOLLOWS:

REMOVE THE VACUUM RETARD DELAY VALVE (VRDV) FROM THE COMBINATION AIR BYPASS/AIR CONTROL VALVE THERMACTOR AIR DIVERTER (TAD) VACUUM HOSE AND INSTALL A STRAIGHT VACUUM CONNECTOR.

^ PERFORM THE ENGINE RUNNING EEC SELF-TEST.

^ IF CODES 41 OR 45 APPEAR, FOLLOW THE ENGINE/EMISSION DIAGNOSIS SHOP MANUAL (VOLUME H) PROCEDURES AS AMENDED BY TECHNICAL SERVICE BULLETINS 90-6B-14 AND 90-25B-11.

^ REINSTALL THE VRDV PER THE RECALL INSTRUCTIONS.

^ THIS INFORMATION IS PROVIDED FOR POST-REPAIR SERVICING OF AFFECTED VEHICLES. A SPECIAL SERVICE INFORMATION DECAL IS ATTACHED TO THE TEST CONNECTOR OF EACH VEHICLE SERVICED.

^ POST-RECALL DIAGNOSTIC SERVICE/REPAIRS SHOULD BE CLAIMED UNDER APPROPRIATE WARRANTY COVERAGE.