25
24 690 31 Rev. D
KohlerEngines.com
Propane EFI System
ELECTRICAL COMPONENTS
Electronic Control Unit (ECU)
Pinout of ECU
Black Connector Side
Pin #
Function
1
Ignition Coil #1 Ground
2
Battery Ground
3
Diagnostic Communication Line
4
Speed Sensor input
5
Fuel Injector Output #1 Ground
6
Fuel Injector Output #2 Ground
7
Oxygen Sensor Heater
8
Intake Air Temperature (IAT) sensor or TMAP
sensor input
9
Fuel Lock-Off Ground
10
Ground for TPS, IAT and MAP sensors or TMAP
sensor, O2 and Oil sensors
11
MAP sensor or TMAP sensor input
12
Throttle Position Sensor (TPS) input
13
Speed Sensor Ground
14
Oil Temperature Sensor input
15
Ignition Switch (Sw12V)
16
Power for TPS sensor, MAP sensor or TMAP
sensor (+5V)
17
Oxygen Sensor (O2) input
18
Battery Power (Per12V)
Grey Connector Side
Pin #
Description
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
17
Fuel Lock-Off Control (+12V)
18
Not Used
BLACK CONNECTOR SIDE
GREY CONNECTOR SIDE
ECU
Pinout of ECU
