Mercury MerCruiser MCM 7.4L MPI User Manual

GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-14 90-861326--1 MARCH 1999
MEFI 1 - 454/502 Mag MPI and 8.2L MPI Symptom Chart (J-2 Circuits)
(Continued)
Pin
Circuit
(CKT)
Wire
Normal Voltage
Diagnostic
Tro ble
Possible
Pin
Pin
Function
(CKT)
Number
(#)
Wire
Color
Ignition
ON
Engine
Running
Tro
u
ble
Codes
DTC(s)
Possible
Symptoms
J2-22
Port Fuel
Jumper
901 WHT – – – –
J2-23
Ignition
Control
Signal
423 WHT
0
(NOTE 5)
1.2V 42
Stall, Will
Restart In
Bypass
Mode, Lack
Of Power
J2-24
Ignition
Control
Bypass
424
TAN/
BLK
0
(NOTE 5)
4.5V 42
Lack Of
Power,
Fixed Timing
J2-25 Not Used – – – – – –
J2-26 Not Used – – – – – –
J2-27
Discrete
Switch
Signal
31 TAN – – –
Audio Warn-
ing System
Activated
J2-28
IAC “A”
High
441
BLU/
WHT
Not
Usable
Not
Usable
None
Rough Un-
stable or In-
correct Idle
J2-29
IAC “B”
Low
444
GRN/
BLK
Not
Usable
Not
Usable
None
Rough Un-
stable or In-
correct Idle
J2-30 Not Used – – – – – –
J2-31
MIL
Lamp
419
BRN/
WHT
0
(NOTE 5)
0
(NOTE 5)
None
Lamp Inop-
erative
J2-32 Not Used – – – – – –
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Index

Mercury MerCruiser MCM 7.4L MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 7.4L MPI
Category	Engine
Language	English