SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Chart A-7 (6 of 6): Ignition System Check
Step
Action
Yes
No
PROCEED TO
With key in RUN position, measure voltage at positive (+)
terminal on ignition coil.
Chart
Step 25.
24.
25.
A–6
Is Voltage Greater Than 10 Volts?
Unplug WHT/RED bullet connectors from distributor and
measure voltage on CKT 439 from harness.
Step 26. Step 28.
Is Voltage Greater Than 10 Volts?
a. Reconnect WHT/RED bullet connectors.
b. Remove high tension lead from distributor at coil.
c. Insert a spark gap tester from coil tower to ground.
d. Disconnect WHT/GRN lead from distributor.
e. Ignition ON.
26.
Step 29. Step 27.
f.
Rapidly (2 – 3 times per second) strike the terminal of
the PPL/WHT lead from the harness against ground (–).
Is There Spark at Coil?
a. Substitute a new ignition coil.
27.
28.
b. Repeat above test.
Is There Spark at Coil?
Check IGN / INJ fuse.
Is Fuse Good?
Step 30. Step 31.
Step 32. Step 33.
29.
30.
31.
32.
33.
Replace ignition sensor in distributor.
Install new ignition coil.
Repair CKT 430.
Verify
–
Repair
Repair open CKT 439 to distributor.
Replace fuse.
Index
90-861327--1
OCTOBER 1999
Page 5G-43
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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