SERVICE MANUAL NUMBER 23
GENERAL SYSTEM DIAGNOSTICS
Chart A-7 (4 of 6): Ignition System Check (Continued)
Step
Action
Value(s)
Yes
No
1.
2.
Disconnect distributor 4-wire
connector.
Check for secondary spark.
4
_
Is Adequate Spark Present?
Go to Step 18
Go to Step 19
Go to Step 5
1.
Reconnect distributor 4-wire
connector.
Check for secondary spark
from the coil tower using a
known good coil wire.
2.
5
_
Is Adequate Spark Present?
Go to Step 6
1.
Disconnect distributor 2-wire
“C/+” connector harness.
2.
3.
Ignition “ON,” engine “OFF.”
Using DVOM, check voltage
at “+” and “C” terminals of the
6
7
10 volts
10 volts
2-wire
connector.
Is Voltage Reading Greater
Than The Specified Value At
Both Terminals?
distributor harness
Go to Step 8
Go to Step 7
Is Voltage Reading Less Than
The Specified Value At Both
Terminals?
Go to Step 20 Go to Step 21
1.
Reconnect distributor 2-wire
connector.
2.
3.
Ignition “ON” engine “OFF.”
Using DVOM, check voltage
from tach terminal to ground.
The tach terminal can be
accessed at the 5-wire boat
harness connector. The tach
circuitistheWHITEwireCKT
121.
4.
8
1-10 volts
Is Voltage Reading Within The
Specified Value?
Go to Step 15
Go to Step 9
Is Voltage Reading Greater
Than The Specified Value?
9
10 volts
Go to Step 10 Go to Step 22
1.
Using a test light connected
to ground, probe tach termi-
nalatthe5-wireharnesscon-
nector.
10
2.
Observe the test light while
cranking engine.
Is Test Light Blinking?
Go to Step 13 Go to Step 11
Index
90-861326--1
MARCH 1999
Page 5E-87
| 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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