Mercury 305 CID - Page 598

ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-5790-823225--1 1096
No DLC Data or Will Not Flash Code 12
Chart A-2: (2 of 2)
YES NO
SEE
CHART A-1
12
4
• ENTER SERVICE MODE ON DIAGNOSTIC
CODE TOOL.
DOES “MALFUNCTION INDICATOR LAMP”
FLASH CODE 12?
• IGNITION “OFF.”
• DISCONNECT ECM J-2 CONNECTOR.
• IGNITION “ON” AND NOTE “MALFUNCTION INDICATOR
LAMP”
• MARINE DIAGNOSTIC CODE TOOL INSTALLED.
• IGNITION “ON,” ENGINE “OFF.”
IS THE “MALFUNCTION INDICATOR LIGHT “ON”?
• IF PROBLEM WAS NO DLC DATA (USING SCAN TOOL)
CHECK SERIAL DATA CKT 461 FOR OPENS OR SHORTS
TO GROUND. IF OK, IT IS A FAULTY ECM.
NO YES
LIGHT “OFF” LIGHT “ON”
• IGNITION “OFF.”
• JUMPER TERMINALS “A” TO “B” AT DLC CONNECTOR.
• CONNECT TEST LIGHT BETWEEN ECM CONNECTOR
TERMINAL “J1-7” AND B+ BATTERY POSITIVE.
REPAIR SHORT TO
GROUND IN CKT 419.
LIGHT “OFF”LIGHT “ON”
• REPLACE ECM.
• RECHECK FOR CODE 12.
• CHECK FOR OPEN IN DLC DIAGNOSTIC
TERMINALS “A” AND “B” (CKT 450 AND
CKT 451), REPAIR AS NECESSARY.
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