Mercury MerCruiser MCM 502 Mag MPI User Manual

GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-10 90-861326--1 MARCH 1999
MEFI 1 - 454/502 Mag MPI and 8.2L MPI Symptom Chart (J-1
Circuits)
See page 5E-4 for NOTES
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
J1-1
Knock
Sensor
Signal
485 BLK 9.5V 9.5V 43
Poor Fuel
Economy,
Poor
Performance
Detonation
J1-2
ECT Sig-
nal
410 YEL
1.95V
(NOTE 2)
1.95V
(NOTE 2)
14
Poor
Performance,
Exhaust
Odor, Rough
Idle RPM
Reduction
J1-3 Not Used – – – – – –
J1-4 Not Used – – – – – –
J1-5
Master/
Slave
916 YEL B+ B+ None
Lack Of
Data From
Other
Engine
(Dual
Engine
Only)
J1-6
Discrete
Switch
931 BRN – – None
J1-7
Diagnos-
tic Test
451
WHT/
BLK
B+ B+ None
Incorrect
Idle, Poor
Performance
J1-8 Not Used – – – – – –
J1-9
Map Sig-
nal
432
LT
GRN
4.9V
1.46V
(NOTE 3)
33
Poor
Performance,
Surge, Poor
Fuel
Economy,
Exhaust
Odor
J1-10
TP Sig-
nal
417
DK
BLU
.62V
(NOTE 4)
.62V
(NOTE 4)
21
Poor
Performance
And
Acceleration,
Incorrect
Idle
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Index

Mercury MerCruiser MCM 502 Mag MPI Specifications

General

Brand	Mercury
Model	MerCruiser MCM 502 Mag MPI
Category	Engine
Language	English