Mercury 305 CID - Page 624

ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-8390-823225--1 1096
Lanyard Stop (Emergency Stop) Circuit Check
(2 of 2)
• TURN IGNITION “OFF.”
• TURN IGNITION “ON” AND CRANK ENGINE DOES ENGINE START?
• CHECK LANYARD STOP SWITCH TO MAKE
SURE SWITCH IS IN ITS NORMAL POSITION.
IS IT?
LANYARD STOP CIRCUIT FUNCTIONING
PROPERLY. REFER TO “DIAGNOSTIC AIDS”
ON FACING PAGE.
YES
NO
• IGNITION “OFF.”
• DISCONNECT 2 WAY HARNESS CONNECTOR.
• USING A DVOM, MEASURE RESISTANCE
BETWEEN PIN A (CKT 942) AND PIN B (GRD) OF
OF 2 WAY CONNECTOR. RESISTANCE SHOULD
BE LESS THAN 5K OHMS IS IT?
• RESISTANCE SHOULD BE INFINITE ON LANYARD
STOP HARNESS SIDE. IS IT?
POSITION SWITCH CORRECTLY AND
REPEAT STEP #1.
NO
YES
RESISTANCE LOWER ON
ECM SIDE OF CONNECTOR.
RESISTANCE LOWER ON
LANYARD STOP SWITCH
SIDE OF CONNECTOR.
BASIC HEI PROBLEM.
REFER TO “IGNITION
SYSTEM CHECK.”
CHECK FOR FAULTY
LANYARD STOP SWITCH.
IF OK, REPAIR SHORT TO
GROUND IN CKT 942
AND RETEST.
• DISCONNECT ECM J-1
CONNECTOR.
• MEASURE RESISTANCE
BETWEEN PIN J1-21 OF
ECM CONNECTOR AND
GROUND. RESISTANCE
SHOULD BE INFINITE.
IS IT?
YES NO
FAULTY ECM. REPLACE ECM
AND RETEST LANYARD STOP
CIRCUIT.
REPAIR SHORT TO GROUND
IN CKT 942 BETWEEN ECM
J1 CONNECTOR AND LAN-
YARD STOP SWITCH.
1
2
3
4
5
4
NOTE: THIS CHART ASSUMES THE ENGINE CRANKS BUT WILL NOT START.
NO
YES
YES
NO
NO
YES
YES
NO
NO
YES
YES
YES