Engine Controls - Expanation of Code 12 Flashing

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Bulletin: 92-6E-6

Date: Dec. '91

Ref. No.: 92-108-6E

Corp. Ref. No.: 116523


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 6E3 - DRIVEABILITY AND EMISSIONS EXPLANATION OF CODE 12 FLASHING

MODELS AFFECTED:
1990-92 CENTURY MODELS WITH 3300 (VIN N)


This bulletin is to make the service community aware of a system anomaly on Century models equipped with a 3300 (VIN N) engine.

When there are no trouble codes stored in the ECM's memory and the system is requested to flash out codes, Code 12 will flash three times then there will be a pause of approximately 30 seconds, then Code 12 will flash again.

It is suggested that a scan tool be used to check for trouble codes to avoid confusion. DO NOT replace ECM's or MEM-CALs to try to correct this anomaly, it is normal operation for this system.

If a trouble code is stored in memory, Code 12 will flash three times, then the trouble code(s) will flash three times, then back to Code 12, which is normal operation.

If trouble codes are cleared or the ECM is disconnected, and then flashing of codes is requested before the engine has been started, Code 12 will flash continuously.