SERVICE MANUAL NUMBER 24
DIAGNOSTICS
Chart A-1 (2 of 2): No MIL or No DLC Data
Step
Action
Yes
No
PROCEED TO
Was the “On-Board Diagnostic” (OBD) System Check
Performed?
1.
Step 2.
OBD
a. Remove CodeMate Tester or Scan Tool.
b. Ignition ON, engine OFF.
2.
3.
4.
Step 3. Step 10.
Step 11. Step 4.
Step 5. Step 13.
c. Using a test light connected to ground (–), probe termi-
nal “F” of the DLC.
Does The Test Light Illuminate?
Using a test light connected to battery positive (B+), probe
terminal “E” of the DLC.
Does The Test Light Illuminate?
a. Ignition OFF.
b. Disconnect ECM connectors.
c. Using a DVOM, measure the resistance between ECM
CKT 419 and DLC terminal “E.”
Is The Resistance Less Than 1 ohm?
5.
6.
Are you using a Scan Tool?
Step 6. Step 11.
Step 7. Step 14.
Check the ECM / DLC fuse.
Is The Fuse Good?
a. Ignition OFF.
b. Disconnect the ECM connectors.
7.
Step 8. Step 10.
c. Using a test light connected to ground, probe ECM CKT
440.
Does The Test Light Illuminate?
a. Ignition ON, engine 0FF.
b. Using a test light connected to ground (–), probe ECM
CKT 439.
8.
9.
Step 12. Step 9.
Does The Test Light Illuminate?
Check the Ignition / Injection fuse.
Is The Fuse Good?
Chart
Step 15.
A-6
10.
11.
Locate and repair open or short to ground in CKT 440.
Repair or replace faulty CodeMate Tester.
If problem was no DLC data (using scan tool), check serial
data CKT 461 for an open or short to ground or locate and
repair faulty ECM grounds.
12.
Verify
–
Repair
13.
14.
15.
Locate and repair open in CKT 419.
Locate and repair short to ground in the battery feed circuit.
Locate and repair short to ground in CKT 439.
Index
90-861327--1
OCTOBER 1999
Page 5G-27
| 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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