Throttle Body Injection Fuel System Diagnosis (Continued)
Chart A-7: (6 of 6)
FROM CHART
A-7 (4 OF 6)
1
•
•
•
•
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?
YES
NO
2
•
•
IGNITION “OFF.”
•
CHECK FUEL PUMP RELAY FUSE.
IS IT OK?
USING FUSED JUMPER, CONNECT
TERMINALS “30” AND “87” OF FUEL
PUMP RELAY CONNECTOR TOGETHER.
•
•
IGNITION “ON.”
FUEL PUMP SHOULD RUN. DOES IT?
YES
NO
REPAIR OPEN CKT
REPAIR SHORT TO
GROUND IN CKT 339
AND REPLACE FUSE
339
OR 902
YES
NO
3
4
•
•
•
IGNITION “OFF.”
DISCONNECT FUSED JUMPER.
CONNECT TEST LIGHT TO BATTERY POSITIVE
B+ AND PROBE CAVITY “86” OF THE
FUEL PUMP RELAY CONNECTOR.
CHECK FOR:
•
•
OPEN WIRE IN CKT 120.
OPEN PUMP GROUND CKT 150. IF OK,
REPLACE FUEL PUMP.
•
LIGHT SHOULD BE “ON.” IS IT?
YES
NO
•
CONNECT TEST LIGHT TO GROUND
AND PROBE CAVITY “85” OF THE FUEL
PUMP RELAY CONNECTOR.
REPAIR OPEN
GROUND CKT 450
•
•
IGNITION “ON.”
TEST LIGHT SHOULD BE “ON” FOR
2
SECONDS AND THEN GO “OFF.”
DOES IT?
YES
NO
•
REPLACE FUEL PUMP RELAY AND RETEST.
IF STILL NO PRESSURE, CHECK THE FOLLOWING:
VAPOR LOCK CONDITION.
RESTRICTED FUEL LINE.
DISCONNECTED HOSES.
CHECK FOR OPEN
IN CKT 465. IF OK,
REPLACE ECM.
•
•
•
•
PROPER FUEL LEVEL.
IF OK, REPLACE FUEL PUMP.
Index
90-823224--2 796
ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY) - 5C-71
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
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This book is invaluable if you do your own repairs. Great book.
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