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