Ignition System Check
(2 of 2)
IGNITION CONTROL
DIST. REFERENCE “HIGH”
BYPASS
DIST. REFERENCE “LOW”
TO IN-LINE HARNESS (TACH)
TO DISTRIBUTOR
TEST DESCRIPTION:
6. This should turn OFF the module and cause a
spark. If no spark occurs, the fault is most likely
in the ignition coil because most module prob-
lems would have been found before this point in
the procedure.
Number(s) below refer to circled number(s) on the
diagnostic chart.
5.
Applying a voltage (1.5 to 8 volts) to module ter-
minal “P” should turn the module ON and the
“Tach” terminal voltage should drop to about 7-9
volts. This test will determine whether the module
or coil is faulty or if the pick-up coil is not generat-
ing the proper signal to turn the module “ON.”
This test can be performed by using a DC battery
with a rating of 1.5 to 8 volts. The use of the test
light is mainly to allow the “P” terminal to be
probed more easily. Some digital multimeter can
also be used to trigger the module by selecting
ohms, usually the diode position. In this position,
the meter may have a voltage across its terminals
whichcanbeusedtotriggerthemodule.Thevolt-
ageintheohmspositioncanbecheckedbyusing
a second meter or by checking the manufactur-
er’s specification of the tool being used.
Index
5C-76 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
Thank you