1991 Sonata Engine Control Unit Wiring

Pin
Connection
Pin
Connection
1
Spark Plug Timing Adjust
53
Empty
2
Empty
54
Fuel Pump Relay
3
Air Flow Sensor
55
Empty
4
Empty
56
Power Transistor (ignition)
5
Intake Air Temp. Sensor (IAT/ATS)
57
EGR Solenoid (CA only)
6
A/C Signal (switch)
58
Fuel Injector #2
7
Idle Position Switch
59
Fuel Injector #1
8
P/S Switch (oil pressure)
60
Empty
9
Oxygen Sensor
61
Empty
10
Empty
62
Empty
11
Diagnosis Control Signal [0.5 BR wire]
63
A/C Relay
12
Diagnosis [0.5 LgB wire]
64
Emissions Indicator Lamp (USA only)
13
Sensor Ground
65
Empty
14
Sensor Power Source (5v)
66
Purge Solenoid
15
Top Dead Center Sensor
67
Injector #4
16
Crank Angle Sensor
68
Injector #3
17
WTS (Coolant Tempurature Sensor)
101
Empty
18
Throttle Position Sensor (TPS)
102
Neutral Safety Switch (MT/AT)
19
Vehicle Speed Sensor
103
Battery (Power Supply for backup)
20
MPS (Motor Position Sensor?)
104
Battery (Power Supply)
21
Barometric Presure Sensor (BPS)
105
Ground
22
EGR Temperature Sensor (CA only)
106
Empty
23
Sensor Ground
107
Fuel Pump Relay Signal (#13 on C02-1)
24
Sensors Power Source (5v)
108
* "ST" terminal for ignition switch
51
Idle Speed Control Motor (Ext)
109
Battery (Power Supply)
52
Idle Speed Control Motor (Ret)
110
Ground