DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Discrete Input Circuit Check(2 of 5)
NOTE: The ECM should only be replaced after all switches and circuits have been tested
and found to be functioning properly.
TESTING BUZZER
Step
Action
Yes
No
PROCEED TO
Key ON, Engine OFF.
Does buzzer sound?
Start engine.
1.
2.
Step 2.
OBD
Step 3. Step 6.
Step 4. Step 5.
Does buzzer sound?
a. Disconnect TAN/BLU or BLU wire at buzzer.
b. Key ON, Engine OFF.
3.
c. Touch TAN/BLU or BLU wire to ground (–).
Does buzzer sound?
Buzzer is working properly. Proceed to “Testing Switches”
or “Testing Circuits.”
4.
5.
–
–
–
Ensure that there is battery power (+) to the PUR wire
going to buzzer. If there is, replace buzzer.
Verify
Repair.
Discrete switches may all be functioning properly.
Proceed to check all discrete circuits to verify each works
properly.
Verify
Repair.
6.
–
TESTING OIL PRESSURE SWITCH
Step
Action
Yes
No
PROCEED TO
a. Disconnect MEFI 1 or MEFI 2 BLU/TAN or MEFI 3 BLU
wire from oil pressure switch.
b. Engine OFF.
1.
Step 2. Step 3.
c. Check for continuity between terminal on switch and
ground (–).
Is there continuity?
a. Start engine.
b. Check for continuity between terminal on switch and
ground (–).
Switch
Step 3.
2.
3.
OK
Is there continuity?
Verify
–
Replace oil pressure switch.
Repair.
Index
Page 5G-48
90-861327--1 OCTOBER 1999
| 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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