Mercury 305 CID - Page 608

ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5E-6790-823225--1 1096
Multi-Port Injection Fuel System Diagnosis (Continued)
Chart A-7: (6 of 6)
• IGNITION “OFF.”
• REMOVE FUEL PUMP RELAY.
• IGNITION “ON.”
• WITH TEST LIGHT CONNECTED TO
GROUND, PROBE FUEL PUMP RELAY
CONNECTOR CAVITY “30” TEST LIGHT
SHOULD BE “ON.” IS IT?
• IGNITION “OFF.”
• USING FUSED JUMPER, CONNECT
TERMINALS “30” AND “87” OF FUEL
PUMP RELAY CONNECTOR TOGETHER.
• IGNITION “ON.”
• FUEL PUMP SHOULD RUN. DOES IT?
• CHECK FUEL PUMP RELAY FUSE.
IS IT OK?
REPAIR OPEN CKT
339 OR 902
REPAIR SHORT TO
GROUND IN CKT 339
AND REPLACE FUSE
• IGNITION “OFF.”
• DISCONNECT FUSED JUMPER.
• CONNECT TEST LIGHT TO BATTERY POSITIVE
B+ AND PROBE CAVITY “86” OF THE
FUEL PUMP RELAY CONNECTOR.
• LIGHT SHOULD BE “ON.” IS IT?
CHECK FOR:
• OPEN WIRE IN CKT 120.
• OPEN PUMP GROUND CKT 150. IF OK,
REPLACE FUEL PUMP.
• CONNECT TEST LIGHT TO GROUND
AND PROBE CAVITY “85” OF THE FUEL
PUMP RELAY CONNECTOR.
• IGNITION “ON.”
• TEST LIGHT SHOULD BE “ON” FOR
2 SECONDS AND THEN GO “OFF.”
DOES IT?
REPAIR OPEN
GROUND CKT 450
CHECK FOR OPEN
IN CKT 465. IF OK,
REPLACE ECM.
• REPLACE FUEL PUMP RELAY AND RETEST.
IF STILL NO PRESSURE, CHECK THE FOLLOWING:
• VAPOR LOCK CONDITION.
• RESTRICTED FUEL LINE.
• DISCONNECTED HOSES.
• PROPER FUEL LEVEL.
IF OK, REPLACE FUEL PUMP.
1
2
3
4
FROM CHART
A-7
(4 OF 6)
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO