GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5E-51
General Diagnostic Tests
IMPORTANT: These tests are for MEFI 1 and MEFI 2 Engines only. MEFI 3 diagnostic
tests will be provided as soon as available. References to 454 cid / 502 cid engines
are MEFI 1, references to 7.4L engines are MEFI 2.
IMPORTANT: Non-scan tool refers to the CodeMate Tester.
On-Board Diagnostic (OBD) System Check (Non-Scan)
461 ORN/BLK
451 WHT/BLK
a
b
c
d
e
f
g
h
i
j
k
l
m
n
a-ECM/DLC 15 Amp Fuse
b-DLC Connector
c-Marine Diagnostic Code Tool
d-ECM, Injector Knock Sensor Module 10 Amp Fuse
e-(ORN-Some models)
f-(BLK-Some models)
g-Serial Data
h-ECM Ground
i-ECM Ground
j-Diagnostic Test Terminal
k-Malfunction Indicator Lamp
l-Ignition Feed
m-Battery Feed
n-Battery Feed
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