Mercury MerCruiser MCM 454 Mag MPI Service Manual page 621

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