Kohler Command Pro EFI ECH940 Service Manual page 44

EFI SYSTEM
Function Test
High Pressure Fluids can puncture skin and
cause severe injury or death.
Do not work on fuel system without proper
training or safety equipment.
Fluid puncture injuries are highly toxic and hazardous.
If an injury occurs, seek immediate medical attention.
Function of fuel system is to provide suffi cient delivery
of fuel at system operating pressure of 39 psi ± 3. If an
engine starts hard, or turns over but will not start, it may
indicate a problem with EFI fuel system. A quick test will
verify if system is operating.
1. Disconnect and ground spark plug leads.
2. Complete all safety interlock requirements and crank
engine for approximately 3 seconds.
3. Remove spark plugs and check for fuel at tips.
a. If there is fuel at tips of spark plugs fuel pump and
injectors are operating.
b. If there is no fuel at tips of spark plugs, check
following:
1. Make sure fuel tank contains clean, fresh,
proper fuel.
2. Make sure that vent in fuel tank is open.
3. Make sure fuel tank valve (if equipped) is fully
opened.
4. Make sure battery is supplying proper voltage.
5. Check that fuses are good, and that no
electrical or fuel line connections are damaged
or broken.
6. Test fuel pump module operation as described
earlier under Fuel Pump.
Diagnostic Fault Code Summary
Fault Code
0031 Oxygen Sensor Heater Circuit Low Voltage
0032 Oxygen Sensor Heater Circuit High Voltage
0107 Manifold Absolute Pressure (MAP or TMAP) Sensor Circuit Low Voltage or Open
0108 Manifold Absolute Pressure (MAP or TMAP) Sensor Circuit High Voltage
0112 Intake Air Temperature (IAT or TMAP) Sensor Circuit Low Voltage
0113 Intake Air Temperature (IAT or TMAP) Sensor Circuit High Voltage or Open
0117 Coolant/Oil Temperature Sensor Circuit Low Voltage
0118 Coolant/Oil Temperature Sensor Circuit High Voltage or Open
0122 Throttle Position Sensor Circuit Low Voltage or Open
0123 Throttle Position Sensor Circuit High Voltage
0131 Oxygen Sensor 1 Circuit Low Voltage, or Open
0132 Oxygen Sensor 1 Circuit High Voltage
0171 Maximum Adaptation Limit Exceeded
0172 Minimum Adaptation Limit Exceeded
0174 Lean Fuel Condition at High Load (Open Loop)
0201 Injector 1 Circuit Malfunction
0202 Injector 2 Circuit Malfunction
44
WARNING
Connection or Failure Description
KohlerEngines.com
Fault Codes
Example of Diagnostic Display
One second pause
(1)
One second pause
One second pause
Three second pause
(6)
One second pause
(1)
(0)
Fault
Code
0107
(0)
(7)
End Code 61
62 690 13 Rev. A