Mercury MerCruiser MCM 454 Mag MPI Service Manual page 676

SERVICE MANUAL NUMBER 23
Chart A-6 (2 of 2): EFI System/Ignition Relay Check
Step
Index
90-861326--1 MARCH 1999
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Action
Was The "On-Board Diagnostic"
1 (OBD) System
Performed?
1. Ignition "OFF."
2. Remove EFI system relay
connector.
3. Ignition "ON."
4. With test light still connected
2
to ground, probe relay har-
ness connector
"86" and "30."
Does Test Light Illuminate
Brightly On Both Terminals?
Using test light connected to
battery positive (B+), probe relay
harness connector terminal "85."
3
Does Test Light Illuminate
Brightly?
Check relay connector for poor
contact or corrosion. If OK,
4
replace faulty EFI system relay.
Is Action Complete?
Locate and repair open or short
to ground in circuit that did not
5
light (CKT 2 and/or CKT 3).
Is Action Complete?
Locate and repair open ground
6
CKT 150.
Is Action Complete?
Value(s)
Check –
–
terminals
–
–
–
–
GENERAL SYSTEM DIAGNOSTICS
Yes No
Go to OBD
Go to Step 2
System Check
Go to Step 3 Go to Step 5
Go to Step 4 Go to Step 6
Go to OBD
–
System
Check
Go to OBD
–
System
Check
Go to OBD
–
System
Check
Page 5E-83