MerCruiser 305 CID (5.0L) Service Manual page 634

SERVICE MANUAL NUMBER 24
J-1 Circuits with MEFI 1 and MEFI 2 (Continued)
Pin Pin
Pin CKT
Func-
tion
Knock
J1-1 485
Sensor
ECT
J1-2 410
Signal
Discrete
J1-4 931
Switch
Master/
J1-5 916
Slave
Discrete
J1-6 931
Switch
Diag-
J1-7 451
nostic
Test
Map
J1-9 432
Signal
TP
J1-10 417
Signal
Ignition
J1-11 439
Fused
Sensor
J1-13 813
Ground
ECM
J1-14 450
Ground
TP 5V
J1-15 416
Power
J1-16 Battery 440
Serial
J1-18 461
Data
Shift
J1-19 923
Switch
Lanyard
J1-21 942
Stop
MAP
J1-29 814
Ground
ECM
J1-30 450
Ground
MAP 5V
J1-31 416
Power
J1-32 Battery 440
See Page 5G-6 For NOTES
Index
90-861327--1 OCTOBER 1999
Normal Voltage
Wire
Ignition Engine
Color
ON Running
GRN 9.5V 9.5V
1.95V 1.95V
YEL
(NOTE 2) (NOTE 2)
BRN –
YEL B+ B+
BRN –
BLK/
B+ B+
WHT
LT 1.46V
4.9V
GRN
(NOTE 3)
DK .62V .62V
BLU
(NOTE 4) (NOTE 4)
PNK/
B+ B+
BLK
0
BLK
(NOTE 5) (NOTE 5)
BLK/ 0
WHT
(NOTE 5) (NOTE 5)
GRY 5V 5V
ORN B+ B+
ORN/
5V 5V
BLK
WHT 0
PNK 0
0
BLK
(NOTE 5) (NOTE 5)
BLK/ 0
WHT
(NOTE 5) (NOTE 5)
GRY 5V 5V
ORN B+ B+
DTC
Poor Fuel Economy, Poor
43
Poor Performance, Exhaust Odor,
14
Rough Idle rpm Reduction
Power Reduction Mode Alarm
– None
Lack Of Data From Other Engine
None
Power Reduction Mode Alarm
– None
None Incorrect Idle, Poor Performance
Poor Performance, Surge, Poor Fuel
33
Poor Performance And Acceleration,
21
None
0 High Idle, Rough Idle, Poor
21,23
Performance Exhaust Odor
0
None
21
None
None
0 None
0 None
0 Lack Of Performance,Exhaust Odor,
33
0
None
Lack Of Power, Surge, Rough Idle,
33
None
DIAGNOSTICS
Possible Symptoms
Performance Detonation
Activation
(Dual Engine Only)
Activation
Economy, Exhaust Odor
Incorrect Idle
No Start
No Start
Lack Of Power, Idle High
No Start
No Serial Data
Incorrect Idle
No Start
Stall
No Start
Exhaust Odor
No Start
Page 5G-7