Mercury MerCruiser MCM 454 Mag MPI Service Manual page 682

SERVICE MANUAL NUMBER 23
Chart A-7 (6 of 6): Ignition System Check
Step
Index
90-861326--1 MARCH 1999
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Action
Replace faulty pick-up coil.
18
Is Action Complete?
Inspect distributor cap for water,
cracks, etc. If OK, replace faulty
19
distributor rotor.
Is Action Complete?
Check for open or short to
ground in CKT 3, the pink wire
from the ignition module "+"
terminal to the ignition coil. Also
20
check for open CKT 902, the red
wire from the EFI system relay to
the ignition coil.
Is Action Complete?
Check for open or short to
ground in CKT 121, the brown
wire from the ignition module "C"
21
terminal to the ignition coil. If OK,
replace faulty ignition coil.
Is Action Complete?
Repair faulty connections or
22 open tach lead.
Repeat Step 8.
Check ignition module ground. If
OK, replace faulty
23
module.
Is Action Complete?
Replace distributor pole piece
24 and shaft assembly.
Is Action Complete?
A mechanical repair will be
25 necessary before continuing with
this test.
Value(s)
Go to OBD
–
Go to OBD
–
–
Go to OBD
–
Go to OBD
Go to OBD
–
ignition
Go to OBD
–
Go to OBD
–
–
GENERAL SYSTEM DIAGNOSTICS
Yes No
System –
Check
–
System
Check
–
System
Check
–
System
Check
System
–
Check
–
System
Check
System
–
Check
– –
Page 5E-89