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ELECTRICAL COMPONENTS
Electronic Control Unit (ECU)
Pinout of ECU
Black Connector Side
Pin #
1
Ignition Coil #1 Ground
2
Battery Ground
3
Diagnostic Communication Line
4
Crankshaft Position Sensor input
5
Fuel Injector Output #1 Ground
6
Fuel Injector Output #2 Ground
7
Oxygen Sensor Heater
8
Intake Air Temperature (TMAP) sensor input
9
Fuel Pump Ground/Relay Switch
Ground for TPS, TMAP, O2 and Coolant
10
Temperature Sensors
Manifold Absolute Pressure (TMAP) sensor
11
input
12
Throttle Position Sensor (TPS) input
13
Crankshaft Position Sensor Ground
14
Coolant Temperature Sensor input
15
Ignition Switch (Switched +12V)
16
Power for TPS and TMAP Sensors (+5V)
17
Oxygen Sensor (O2) input
18
Battery Power (Permanent +12V)
ECU
Pinout of ECU
66 690 14 Rev. A
Function
BLACK CONNECTOR SIDE
KohlerEngines.com
Grey Connector Side
Pin #
1
Not Used
2
Not Used
3
Malfunction Indicator Light (MIL) Ground
4
Not Used
5
Not Used
6
Not Used
7
Not Used
8
Not Used
9
Battery Ground
10
Ignition Coil #2 Ground
11
Not Used
12
Not Used
13
Not Used
14
Safety Switch Ground
15
Not Used
16
ECU Diagnostics
17
Fuel Pump Control (+12V)
18
Not Used
GREY CONNECTOR SIDE
EFI System
Description
31
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