Mercury MerCruiser MCM 7.4L MPI - Page 673

GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-80 90-861326--1 MARCH 1999
Chart A-5 (3 of 3): Fuel System Electrical Test
Step Action Value(s) Yes No
9
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?
–
Go to OBD
System
Check
Go to Step 13
10
Locate and repair open in CKT
339 or CKT 902.
Is Action Complete?
–
Go to OBD
System
Check
–
11
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?
–
Go to OBD
System
Check
–
12
Locate and repair open in CKT
120 or CKT 150.
Was A Problem Found?
–
Go to OBD
System
Check
Go to Step 13
13
Replace faulty fuel pump.
Is Action Complete?
–
Go to OBD
System
Check
–
14
Locate and repair open in CKT
450.
Is Action Complete?
–
Go to OBD
System
Check
–
15
Replace faulty ECM.
Is Action Complete?
–
Go to OBD
System
Check
–
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