Mercury MerCruiser MIE 7.4L MPI User Manual

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

Mercury MerCruiser MIE 7.4L MPI Specifications

General

Brand	Mercury
Model	MerCruiser MIE 7.4L MPI
Category	Engine
Language	English