Mercury MerCruiser MCM 454 Mag MPI Service Manual page 636

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