Mercury MerCruiser MCM 7.4L MPI User Manual

GENERAL SYSTEM DIAGNOSTICS SERVICE MANUAL NUMBER 23
Page 5E-28 90-861326--1 MARCH 1999
MEFI 2 - 7.4L MPI Symptom Chart (J-1 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
J1-27 Not Used – – – – – –
J1-28 Not Used – – – – – –
J1-29
MAP
Ground
814 BLK
0
(NOTE 5)
0
(NOTE 5)
33
Lack Of
Perfor-
mance, Ex-
haust Odor,
Stall
J1-30
ECM
Ground
450 BLK
0
(NOTE 5)
0
(NOTE 5)
None No Start
J1-31
MAP 5V
Refer-
ence
416E GRY 5V 5V 33
Lack Of
Power,
Surge,
Rough Idle,
Exhaust
Odor
J1-32 Battery 440 ORN B+ B+ None No Start
J2-1 Not Used – – – – – –
J2-2 Not Used – – – – – –
J2-3 Not Used – – – – – –
J2-4 Not Used – – – – – –
J2-5
Injector
Driver
468
DRK
GRN
B+ B+ None
Rough Idle,
Lack Of
Power, Stall
J2-6
Ignition
Control
Ref. Low
463
RED/
BLK
0
(NOTE 5)
0
(NOTE 5)
None
Poor Perfor-
mance
J2-7
Port Fuel
Jumper
901 BLK – – None –
J2-8
Ignition
Control
Ref. High
430
PUR/
WHT
5V 1.6V None No Restart
J2-9
Fuel
Pump
Relay
Driver
465
DK
GRN/
WHT
0
(NOTE
1&5)
B+ None No Start
J2-10 Not Used – – – – – –
J2-11
Coolant
Over
temp.
112
DK
GRN
0 0 NONE
Improper
Audio Warn-
ing
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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