SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Hesitation, Sag, Stumble Symptom (Continued)
1.
Review all diagnostic procedures
within this table.
2.
If all procedures have been com-
pleted and no malfunctions have
been found, review/inspect the fol-
lowing:
•
•
•
Visual/physical inspection.
Scan tool data.
All electrical connections within a
suspected circuit and/or system.
14
Contact
3.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
MerCruiser
Customer
Service
Was a problem found?
-
Cuts Out, Misses Symptom
Step
Action
Value(s)
Yes
No
Definition: Steady pulsation or jerking that follows engine speed, usually more
pronounced as engine load increases. The exhaust has a steady spitting sound at idle,
low speed or on hard acceleration for fuel starvation that can cause engine to cut out.
Was the “On-Board Diagnostic” (OBD)
System Check performed?
Go to OBD
1
-
-
Go to Step 2 System Check
Was visual/physical check performed?
Go to Visual/
Physical
Check
2
Go to Step 3
1.
2.
Check for contaminated fuel.
Check water separating fuel filter.
3
4
3. If a problem is found, repair as nec-
essary.
Was a problem found?
Go to OBD
System
Check
-
-
Go to Step 4
1.
Check for proper fuel pressure while
the condition exists.
•
Refer to Table A-4 in “General Sys-
tem Diagnostics” section.
2.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
Go to Step 5
1.
Disconnect all injector harness con-
nectors and install an injector test
light J 34730-2 between the harness
terminal connector of each injector.
Crank engine and note light on each
connector. If test light fails to blink at
any one of the connectors, it is a
faulty injector drive circuit harness,
connector or terminal.
2.
5
3.
If a problem is found, repair as nec-
essary.
Go to OBD
System
Check
Was a problem found?
-
Go to Step 6
Index
90-861326--1 MARCH 1999
Page 5D-21
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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