Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID

DIAGNOSTICS
SERVICE MANUAL NUMBER 24
Chart A-1 (1 of 2): No MIL or No DLC Data
ECM
MEFI 1
MEFI 2
MEFI 3
461
ORN/BLK or ORN
J1-18
J1-14
J1-32
J1-4
J1-5
450
BLK/WHT or BLK
BLK/WHT or BLK
450 BLK/WHT or BLK
TO ECM 15A
BATTERY
450
DLC
FUSE
CONNECTOR
J1-30
J1-7
J1-20
TO ECM 15A
BATTERY
FUSE
450
BLK/WHT or BLK
J2-22
451
WHT/BLK
(BLK/WHT - Some Models)
J2-31
J1-11
J1-9
IGN, INJECTOR KS
MODULE 10 AMP
FUSE
J2-32
439
PNK/BLK or PNK
J1-32
J1-16
J2-1
CIRCUIT DESCRIPTION:
When the  CodeMate Tester  is installed,  it plugs  into the  DLC terminals  “F” and  “E.” It
receives voltage through CKT  440 terminal “F.”Terminal “E” is ground  through CKT 419.
There should always be  a steady MIL with the  ignition ON and the engine  stopped. The
Engine Control Module (ECM) turns the MIL on by grounding the MIL driver circuit.
DIAGNOSTIC AIDS:
An intermittent may be caused by a poor connection,  rubbed through wire insulation or a
wire broken inside the insulation. Check for the following items:
Poor connection or damaged harness. Inspect the ECM harness and connectors for
improper mating, broken locks, improperly formed or damaged terminals, poor termi-
nal to wire connection and damaged harness.
If the engine runs OK, check for a faulty light bulb or an open in the MIL driver circuit (CKT
If the engine cranks but will not run, check for an open ECM ignition or battery feed
or a poor ECM to engine ground.
419).
Index
Page 5G-26
90-861327--1   OCTOBER 1999
Product Specification
CategoriesMercury MerCruiser Manuals
Tags,
Model Year1998, 1999, 2000, 2001
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Mercury MerCruiser Engines Service Manual Number 24 GM V-8 305 CID 350 CID SKU UPC Model
Fernando Woll on Dec 09, 2014. Boat Engine

Great performance engine.
Class 1


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