Mercury MerCruiser MCM 454 Mag MPI Service Manual page 603

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