No DLC Data or Will Not Flash Code 12 “Malfunction Indicator Lamp” On
Steady (Marine Diagnostic Code Tool Installed)
Chart A-2 (1 of 2)
DUAL ENGINE DATA LINK
(DUAL ENGINE APPLICATION
ONLY)
C
B
A
916 YEL
J1-5
MASTER/SLAVE
461ORN/BLK
DLC
TO ECM 15A
BATTERY
FUSE
451 WHT/BLK
MALFUNCTION INDICATOR
LAMP
MALFUNCTION INDICATOR
LAMP
CIRCUIT DESCRIPTION:
TEST DESCRIPTION:
There should always be a steady “Malfunction Indi-
cator Lamp” when the ignition is ON and engine
stopped. Ignition voltage is supplied to the light bulb.
The Engine Control Module (ECM) will turn the lamp
ON by grounding CKT 419 in the ECM.
Number(s) below refer to circled number(s) on the
diagnostic chart.
1.
If there is a problem with the ECM that causes a
scan tool to not read serial data, the ECM should
not flash a Code 12. If Code 12 is flashing, check
CKT 451 for short to ground. If Code 12 does
flash, make sure that the scan tool is working
properly on another engine.
With the diagnostic “test” terminal grounded CKT
419,
the lamp should flash a Code 12, followed by
any trouble code(s) stored in memory.
A steady light suggests a short to ground in the lamp
control CKT 419 or an open in diagnostic CKT 451.
2. If the light goes OFF when the ECM connector is
disconnected, CKT 419 is not shorted to ground.
3.
This step will check for an open diagnostic CKT
451.
4.
At this point, the “Malfunction Indicator Lamp”
wiring is OK. If Code 12 does not flash, the ECM
should be replaced.
Index
5C-54 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
90-823224--2 796
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
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