SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Code 45 (2 of 2):
Step
Action
Yes
No
PROCEED TO
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
1.
Step 2.
OBD
a. Ignition ON, engine OFF.
b. Using DVOM, measure voltage at coil positive (+) termi-
nal.
2.
3.
Step 3. Step 7.
Step 4. Step 8.
Is Voltage Greater Than 12 Volts?
a. Ignition OFF.
b. Disconnect ECM J1 connector.
c. Check continuity from ECM CKT 121 to negative (–) ter-
minal of coil.
Is Resistance Less Than 1 ohm?
a. Ignition OFF.
b. Disconnect ECM J1 connector.
4.
5.
Step 9. Step 5.
Step 6. Step 10.
c. Check resistance from ECM CKT 121 to ground.
Is Resistance Less Than 1 ohm?
a. Ignition OFF.
b. Disconnect ECM J1 connector.
c. Check resistance between positive (+) and negative (–)
terminals of coil.
Is Resistance Less Than 2 ohms?
a. Ignition OFF.
b. Disconnect ECM J1 connector.
c. Remove secondary ignition wire from coil.
6.
Step 11. Step 10.
d. Measure resistance between secondary coil tower and
negative terminal of coil.
Is Resistance Greater Than 5 Ohms And Less Than
15
ohms?
7.
8.
Locate and repair open or short to ground in CKT 902.
Locate and repair open in CKT 121.
Locate and repair short to ground in CKT 121.
Replace ignition coil.
Verify
Repair
9.
–
10.
Trouble code 44 is intermittent. Check ignition wires and
plugs.
11.
–
Index
90-861327--1
OCTOBER 1999
Page 5G-85
| 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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