Mefi 1 - 454/502 Mag Mpi And 8.2L Mpi Symptom Chart (J-1 Circuits) - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SERVICE MANUAL NUMBER 23

MEFI 1 - 454/502 Mag MPI and 8.2L MPI Symptom Chart (J-1 Circuits)

(Continued)
Index
90-861326--1 MARCH 1999
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Circuit
Pin Pin (CKT) (CKT)
Pin
Function Number
(#)
Ignition
J1-11 439
Fused
J1-12 Not Used –
TP and
J1-13 813
IAT
Ground
ECM
J1-14 450
Ground
TP 5V
J1-15 416
Refer-
ence
J1-16 Battery 440
J1-17 Not Used –
Serial
J1-18 461
Data
J1-19 Not Used –
J1-20 Not Used –
Lanyard
J1-21 942
Stop
Switch
J1-22 Not Used –
J1-23 Not Used –
IAT Sen-
J1-24 472
sor
J1-25 Not Used –
J1-26 Not Used –
J1-27 Not Used –
Normal Voltage
Wire Wire
Color Ignition Engine
ON Running
PNK/
B+ B+
BLK
– – –
0 0
BLK
(NOTE 5) (NOTE 5)
BLK/ 0 0
WHT
(NOTE 5) (NOTE 5)
GRY 5V 5V
ORN B+ B+
– – –
ORN/
5V 5V
BLK
– – –
– – –
PNK 0 0
– – –
– – –
TAN 5V
(NOTE 2)
– – –
– – –
– – –
GENERAL SYSTEM DIAGNOSTICS
Diagnostic
Trouble Tro ble Possible Possible
Codes Symptoms
DTC(s)
None No Start
– –
High Idle,
Rough Idle,
Poor
21,23
Performance
Exhaust
Odor
None No Start
Lack Of
21
Power, Idle
High
None No Start
– –
No Serial
None
Data
(NOTE 6)
– –
– –
None No Start
– –
– –
Poor Fuel
Economy,
23
Exhaust
Odor
– –
– –
– –
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