MerCruiser 305 CID (5.0L), Руководство по обслуживанию

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DIAGNOSTICS SERVICE MANUAL NUMBER 24
Page 5G-42 90-861327--1 OCTOBER 1999
Chart A-7 (5 of 6): Ignition System Check
Step Action Yes No
PROCEED TO
10.
a. Disconnect distributor 4-wire connector.
b. Remove distributor cap.
c. Disconnect pick-up coil connector from the distributor
ignition control module.
d. Connect D\/OM to CKT 121 tach terminal at the 5-way
or 6-way harness connector and ground.
e. Ignition ON, engine OFF.
f. 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 momentarily
grounded to a known good ground.
Does The Voltage Drop?
Step 11. Step 20.
11.
Check for spark from the coil wire as the test battery lead
is removed?
Is Adequate Spark Present?
Step 16. Step 12.
12.
Replace ignition coil and recheck for spark using Steps 10.
and 11.
Is Adequate Spark Present?
Step 13. –
13.
Reinstall coil and check coil wire from distributor cap. If OK,
replace ignition module.
–
14.
Check for faulty connections or open tach lead. If OK,
replace ignition module and recheck for spark using Steps
10. and 11.
Is Adequate Spark Present?
Verify
Repair
Step 15.
15. Replace ignition coil. –
16. Is the rotating pole piece still magnetized? Step 17. Step 21.
17. Replace faulty pick-up coil.
18.
Inspect distributor cap for water, cracks, etc. If OK, replace
faulty distributor rotor.
19.
Check for open or short to ground in CKT 3, open CKT 902,
open or short to ground in CKT 121. If OK, replace faulty
ignition coil.
Verify
20.
Check ignition module ground. If OK, replace faulty ignition
module.
Verify
Repair
–
21. Replace distributor pole piece and shaft assembly.
22.
A mechanical repair will be necessary before continuing
with this test.
23. Locate and repair intermittent faulty connections.
Index