DIAGNOSTICS
SERVICE MANUAL NUMBER 24
General Diagnostic Tests
On-Board Diagnostic (OBD) System Check
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:
The on-board diagnostic system check must be the starting point for any diagnosis. Before
using this procedure, check the ECM and engine grounds for cleanliness and tightness.
The on-board diagnostic system check is an organized approach to identifying a problem
created by an electronic engine control system malfunction.
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.
Index
Page 5G-24
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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