GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
Chart A-7 (5 of 6): Ignition System Check (Continued)
Step
Action
Value(s)
Yes
No
1.
Disconnect distributor 4-wire
connector.
2.
3.
Remove distributor cap.
Disconnect pick-up coil con-
nector from the distributor
ignition control module.
Connect D\/OM to tach termi-
nalatthe5-wireharnesscon-
nector and ground.
4.
5.
Ignition “ON,” engine “OFF”.
11
6. Connect positive (+) end of
a known good 1.5 volt test
battery to the “P” terminal on
the distributor ignition con-
trol module. Observe the
voltage at the tach terminal
as the negative (–) end of
the test battery is momen-
tarily grounded to a known
good ground.
_
Does The Voltage Drop?
Go to Step 12 Go to Step 23
Go to Step 17 Go to Step 13
Check for spark from the coil wire
as the test battery lead is
removed?
12
13
–
–
Is Adequate Spark Present?
Replace ignition coil and recheck
for spark as set up in steps 11
and 12.
Go to OBD
System
Check
Is Adequate Spark Present?
Go to Step 14
–
Ignition coil removed is OK.
Reinstall coil and check coil wire
from distributor cap. If OK,
replace ignition module.
14
15
–
–
Go to OBD
System
Is Action Complete?
Check
Replace ignition module and
recheck for spark as set up in
steps 11 and 12.
Go to OBD
System
Check
Is Adequate Spark Present?
Go to Step 16
_
Replace ignition coil, it too is
faulty.
Go to OBD
System
16
17
–
–
Check
Is Action Complete?
Is the rotating pole piece still
magnetized?
Go to Step 18 Go to Step 24
Index
Page 5E-88
90-861326--1 MARCH 1999
| 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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