SERVICE MANUAL NUMBER 23
GENERAL SYSTEM DIAGNOSTICS
On-Board Diagnostic (OBD) System Check (Non-Scan)
Step
Action
Value(s)
Yes
No
1.
2.
Ignition “ON,” engine “OFF.”
install
Marine
Diagnostic
Trouble Code (MDTC) tool and
switch it to “Normal Mode.”
Observe the Malfunction Indica-
tor Lamp (MIL).
-
1
3.
Go to Step 2
Go to Step 7
Is the MIL “ON”?
Go to Chart A-1
Go to Step 3
1.
With Marine Diagnostic Trouble
Code Tool on “normal mode.”
Ignition “ON,” engine “OFF.”
Observe the Malfunction Indica-
tor Lamp on the MDTC tool.
2.
3.
-
2
Does the MIL Flash DTC 12?
1.
Switch
Marine
Diagnostic
Trouble Code Tool to “service
mode.”
2. Ignition “ON,” engine “OFF.”
Observe the Malfunction Indica-
tor Lamp on the MDTC tool.
Does the MIL Flash DTC 12?
-
-
3
4
3.
Go to Step 4 Go to Chart A-2
Go to Step 5 Go to Chart A-3
1.
Switch MDTC tool to “Normal
Mode.”
2. Attempt to start the engine.
Did
Continue To Run?
The
Engine
Start
And
1.
2.
Ignition “ON,” Engine “OFF.”
Switch MDTC tool to “Service
Mode.”
Go to
applicable
DTC Chart
-
-
5
6
Are
Stored?
Any
Additional
DTC’s
Go to Step 6
Does A Customer Complaint Or
Driveability Problem Currently
Exist?
Refer to
“Symptoms”
section
Refer to
“Diagnostic
Aids”
1.
2.
Ignition “ON,” engine “OFF.”
Check CKT 451 for a short to
ground.
-
-
7
8
3.
If a problem is found, repair as
necessary.
Repeat OBD
System
Check
Was A Problem Found?
Go to Step 8
Replace the ECM.
Repeat OBD
System
Check
Is Action Complete?
-
Index
90-861326--1
MARCH 1999
Page 5E-53
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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