Mercury MerCruiser MCM 454 Mag MPI User Manual

GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5E-43
MEFI 3 - J-2 Circuits
Pin
Circuit
(CKT)
Wire
Normal Voltage
Diag-
nostic
Possible
Pin
Func-
tion
Num-
ber
(#)
Wire
Color
Ignition
ON
Engine
Running
Trouble
Codes
DTC(s)
Possible
Symptoms
J2-1 Battery 440 ORN B+ B+ None No Start
J2-3
TP and
IAT
Ground
813 BLK
0
(NOTE 5)
0
(NOTE 5)
21,23
High Idle, Rough Idle, Poor Per-
formance Exhaust Odor
J2-4
TP 5V
Refer-
ence
416 GRY 5V 5V 21 Lack Of Power, Idle High
J2-7
Discrete
Switch
114 BLU – – None
J2-8
Discrete
Switch
585
TAN/
WHT
– – None –
J2-10
Ignition
Control
Ref.
High
430
PUR/
WHT
5V 1.6V None No Restart
J2-11
ECT
Signal
410 YEL
1.95V
(NOTE 2)
1.95V
(NOTE 2)
14
Poor Performance,
Exhaust Odor, Rough Idle
RPM Reduction
J2-18
MAP
Ground
814 BLK
0
(NOTE 5)
0
(NOTE 5)
33
Lack Of Performance,Exhaust
Odor, Stall
J2-19
MAP 5V
Refer-
ence
416 GRY 5V 5V 33
Lack Of Power, Surge, Rough
Idle, Exhaust Odor
J2-20
Discrete
Switch
Signal
923 WHT – – – –
NOTE 1: Battery voltage for first two seconds, then 0 volts.
NOTE 2: Varies with temperature.
NOTE 3: Varies with manifold vacuum.
NOTE 4: Varies with throttle movement.
NOTE 5: Less than .5 volt (500 mV).
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Index

Mercury MerCruiser MCM 454 Mag MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 454 Mag MPI
Category	Engine
Language	English