Mercury MerCruiser MCM 454 Mag MPI Service Manual page 622

SERVICE MANUAL NUMBER 23
MEFI 2 - 7.4L MPI Symptom Chart (J-1 Circuits) (Continued)
Index
90-861326--1 MARCH 1999
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Circuit
(CKT) (CKT)
Pin Pin
Pin
Number
Function
(#)
J2-12 Not Used –
IAC "A"
J2-13 442
Low
IAC "B"
J2-14 443
Low
Injector
J2-15 450
Ground
J2-16 Not Used –
J2-17 Not Used –
J2-18 Not Used –
J2-19 Not Used –
Fuel
J2-20 450
Injector
Ground
Injector
J2-21 467
Driver
Port Fuel
J2-22 901
Jumper
Port Fuel
J2-22 901
Jumper
Ignition
J2-23 423
Control
Signal
Ignition
J2-24 424
Control
Bypass
J2-25 Not Used –
Normal Voltage
Wire Wire
Color Ignition Engine
ON Running
– – –
LT
Not Us- Not
BLU/
able Usable
BLK
LT
Not Us- Not
GRN/
able Usable
WHT
0 0
BLK
(NOTE 5) (NOTE 5)
– – –
– – –
– – –
– – –
0 0
BLK
(NOTE 5) (NOTE 5)
DK
B+ B+
BLU
BLK – –
BLK – –
0
WHT 1.2V
(NOTE 5)
0
TAN/
4.5V
BLK
(NOTE 5)
– – –
GENERAL SYSTEM DIAGNOSTICS
Diagnostic
Trouble Tro ble
Possible Possible
Codes
Symptoms
DTC(s)
– –
Rough Un-
None
stable or In-
correct Idle
Rough Un-
None
stable or In-
correct Idle
Rough Run-
ning, Lack
None Of Power,
Poor Perfor-
mance
– –
– –
– –
– –
Rough Run-
ning, Poor
None
Idle, Lack Of
Performance
Rough Idle,
Lack Of
None
Power, Stal-
ling
– –
– –
Stall, Will
Restart In
42 Bypass
Mode, Lack
Of Power
Lack Of
42
Power,
Fixed Timing
– –
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