Kohler Command PRO ECH630 Service Manual page 65

Code: 0174
Component: Fuel System
Fault: Lean fuel condition
Condition: Fuel inlet screen/fi lter plugged, low
pressure at high pressure fuel line, TPS malfunction,
shorted connection or faulty sensor.
Possible Causes:
1. TPS Learn Incorrect
a. Lean condition (check oxygen sensor signal
with VOA and see Oxygen Sensor section).
2. Engine Wiring Harness Related
a. Pin circuit wiring or connectors.
ECU pin Black 10, 12, 16 and 17.
3. Low Fuel Pressure
a. Plugged fi lters.
b. Bad lift pump.
4. Oxygen Sensor Related
a. Sensor connector or wiring problem.
b. Exhaust leak.
c. Poor ground.
5. Poor system ground from ECU to engine, causing
rich running while indicating lean.
6. Fuel pump module connection. See Fuel
Components.
Code: 0201
Component: Fuel Injector
Fault: Injector 1 Circuit Malfunction
Condition: Injector damaged or faulty, shorted or open
connection.
Possible Causes:
1. Injector Related
a. Injector coil shorted or opened.
2. Engine Wiring Harness Related
a. Broken or shorted wire in harness.
ECU pin Black 5.
b. Wiring from Ignition.
3. ECU Related
a. Circuit controlling injector #1 damaged.
Code: 0202
Component: Fuel Injector
Fault: Injector 2 Circuit Malfunction
Condition: Injector damaged or faulty, shorted or open
connection.
Possible Causes:
1. Injector Related
a. Injector coil shorted or opened.
2. Engine Wiring Harness Related
a. Broken or shorted wire in harness.
ECU pin Black 6.
b. Wiring from Ignition.
3. ECU Related
a. Circuit controlling injector #2 damaged.
Code: 0230
Component: Fuel Pump
Fault: Circuit Low Voltage or Open
Condition: Shorted or open connection.
Possible Causes:
1. Fuel Pump Related
a. Fuel pump module open or shorted internally.
2. Engine Wiring Harness related
a. Broken or shorted wire in harness.
ECU pin Black 9 or Grey 17.
3. ECU Related
a. The ECU is damaged.
Code: 0232
Component: Fuel Pump
Fault: Circuit High Voltage
Condition: Shorted connection.
Possible Causes:
1. Fuel Pump Related
a. Fuel pump module damaged internally.
2. Charging Output System Too High.
Section 5
EFI Fuel System
5.33
5