No “Malfunction Indicator Lamp” (Marine Diagnostic Code Tool Installed)
Chart A-1 (1 of 2)
DUAL ENGINE DATA LINK
(DUAL ENGINE APPLICATION
ONLY)
B
C
A
916
YEL
J1-5
MASTER/SLAVE
461
ORN/BLK
DLC
ECM/DLC
TO ECM 15A
15AMP
FUSE
BATTERY
DIAGNOSTIC TEST
TERMINAL
FUSE
451
WHT/BLK
MALFUNCTION IN-
DICATOR LAMP
ECM, INJECTOR KNOCK
SENSOR MODULE
10
AMP FUSE
MALFUNCTION INDICATOR
LAMP
CIRCUIT DESCRIPTION:
DIAGNOSTIC AIDS:
There should always be a steady “Malfunction Indi-
cator Lamp” when the ignition is ON and engine
stopped. Ignition voltage is supplied directly to the
light bulb. The Electronic Control Module (ECM) will
control the light and turn it ON by providing a ground
path through CKT 419 to the ECM.
Engine runs OK, check:
•
•
Faulty light bulb.
CKT 419 open.
Engine cranks but will not run, check:
•
Continuous battery - 50 amp circuit breaker
open.
TEST DESCRIPTION:
•
•
•
•
•
Open ECM fuse.
Number(s) below refer to circled number(s) on the
diagnostic chart.
Battery circuit to ECM open.
Ignition circuit to ECM open.
Poor connection to ECM.
Faulty ECM ground circuit(s).
1.
This step insures that battery voltage is available
to terminal “F” of the DLC connector.
2.
This step checks for ground present in DLC con-
nector terminal “E.” This indicates that the ECM
is capable of completing the ground to the “Mal-
function Indicator Lamp”.
Engine will not crank.
Perform EFI system relay check.
•
3.
4.
This step isolates the cause of incomplete
ground to either a wiring or ECM circuitry.
If the engine fails to crank, this may indicate a fail-
ure in the starting system circuit.
Index
5C-52 - 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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