Mercury MerCruiser MCM 454 Mag MPI Service Manual page 673

GENERAL SYSTEM DIAGNOSTICS
Chart A-5 (3 of 3): Fuel System Electrical Test
Step
9
10
11
12
13
14
15
Index
Page 5E-80
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Action
1. Check for plugged fuel filter,
vapor lock condition,
restricted fuel lines, discon-
nected hoses, and proper
fuel level.
2. If a problem is found, repair
as necessary.
Was A Problem Found?
Locate and repair open in CKT
339 or CKT 902.
Is Action Complete?
Locate and repair short to ground
in CKT 339 or CKT 120. Also
check for contamination in fuel
lines or fuel tank. If OK, replace
fuel pump and fuse.
Is Action Complete?
Locate and repair open in CKT
120 or CKT 150.
Was A Problem Found?
Replace faulty fuel pump.
Is Action Complete?
Locate and repair open in CKT
450.
Is Action Complete?
Replace faulty ECM.
Is Action Complete?
SERVICE MANUAL NUMBER 23
Value(s) Yes
–
Go to OBD
System
Check
Go to OBD
–
System
Check
Go to OBD
System
Check
–
Go to OBD
–
System
Check
Go to OBD
–
System
Check
Go to OBD
System
–
Check
Go to OBD
–
System
Check
90-861326--1 MARCH 1999
No
Go to Step 13
–
–
Go to Step 13
–
–
–