GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
Chart A-2 (3 of 3): Malfunction Indicator Lamp “On” Steady - No DLC Data or
Will Not Flash DTC 12 - Marine Diagnostic Trouble Code (MDTC) Tool Installed
Step
Action
Value(s)
Yes
No
Was the “On-Board Diagnostic”
(OBD)
System Check Performed?
1
-
Go to OBD
System Check
Go to Step 2
1.
2.
Ignition “ON,” engine “OFF.”
Switch MDTC tool to “Service
Mode.”
2
3
-
-
Does The MIL Flash DTC 12?
Go to Step 6
Go to Step 7
Go to Step 3
Go to Step 4
1.
Ignition
“OFF,”
disconnect
ECM connectors.
2. Ignition “ON,” engine “OFF,”
observe the MIL.
Is The MIL “ON”?
1.
2.
Ignition “OFF.”
With ECM “J1” connector dis-
connected, jump terminals “A”
to “B” at the DLC.
4
3. Connect test light between
ECM connector terminal “J1-7”
and battery positive (B+).
-
Does
Test
Light
Illuminate
Brightly?
Go to Step 5
Go to Step 8
Go to Step 9
1.
Verify correct operation of
MDTC tool on a known good
system.
5
6
_
2.
If a problem is found, repair as
necessary.
Go to OBD
System Check
Is Action Complete?
1.
If problem was no DLC data
(using scan tool), check
serial data CKT 461 for an
open or short to ground.
If a problem is found, repair as
necessary.
-
2.
Go to OBD
System Check
Is Action Complete?
Go to Step 9
Locate and repair short to ground
in CKT 419.
7
8
-
-
Go to OBD
System Check
Is Action Complete?
_
_
Locate and repair open in CKT 450
and/or CKT 451.
Go to OBD
Is Action Complete?
System Check
1.
RepairfaultyECMconnections
or replace faulty ECM.
Recheck for DTC 12.
9
_
2.
Go to OBD
Is Action Complete?
System Check
_
Index
Page 5E-64
90-861326--1 MARCH 1999
| 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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