Flow Chart Diagnostic Aids - Kohler Command PRO ECH630 Service Manual

Flow Chart Diagnostic Aids

Diagnostic Aid #1 SYSTEM POWER
(MIL does not illuminate when key is turned ON)
NOTE: MIL is installed by vehicle OEM. Twelve volt
supply to bulb will be part of vehicle wire
harness. Kohler key switch model will have
MIL on engine with 12V supply to bulb.
Possible causes:
1. Batt ery
2. Main system fuse
3. MIL light bulb burned out
4. MIL electrical circuit problem
Pin circuits Grey 3.
5. Ignition switch
6. Permanent ECU power circuit problem
Pin circuit Black 18.
7. Switched ECU power circuit problem
Pin circuit Black 15.
8 ECU grounds
9. ECU
Diagnostic Aid #2 FAULT CODES
(Refer to detailed fault code listing before fl ow
chart and servicing information for the respective
components)
Code 0031 - Oxygen Sensor Heater Circuit High
Voltage
Code 0032 - Oxygen Sensor Heater Circuit Low
Voltage
Code 0107 - Manifold Absolute Pressure Sensor
Circuit Low Voltage or Open
Code 0108 - Manifold Absolute Pressure Sensor
Circuit High Voltage
Code 0112 - Intake Air Temperature Sensor
Circuit Low Voltage
Code 0113 - Intake Air Temperature Sensor
Circuit High Voltage or Open
Code 0117 - Coolant/Oil Temperature Sensor
Circuit Low Voltage
Code 0118 - Coolant/Oil Temperature Sensor
Circuit High Voltage or Open
Code 0122 - TPS Circuit Low Voltage or Open
Code 0123 - TPS Circuit High Voltage
Code 0131 - O2S 1 Circuit Low Voltage or Open
Code 0132 - O2S 1 Circuit High Voltage
Code 0171 - Maximum adaptation limit exceeded
Code 0172 - Minimum adaptation limit exceeded
Code 0174 - Lean fuel condition at high load or open
loop
Code 0201 - Injector 1 Circuit Malfunction
Code 0202 - Injector 2 Circuit Malfunction
Code 0230 - Fuel Pump Module Circuit Low Voltage
or Open
Code 0232 - Fuel Pump Module Circuit High Voltage
Code 0336 - Crankshaft Position Sensor Noisy Signal
Code 0337 - Crankshaft Position Sensor No Signal
Code 0351 - Cylinder 1 Ignition Coil Malfunction
Code 0352 - Cylinder 2 Ignition Coil Malfunction
Code 0562 - System Voltage Low
Code 0563 - System Voltage High
Code 61 - End of Code Transmission.
Diagnostic Aid #3 RUN/ON
(MIL remains ON while engine is running)*
Possible causes:
1. All current fault codes will turn on MIL when
engine is running.
NOTE: Either incandescent or LED type bulbs can
be used for the MIL as long as they do not
draw more than 0.1 amps. The bulb needs
to be rated at 1.4 Watt s or less, or needs to
have a total resistance of 140 Ω or more. LEDs
typically draw less than 0.03 amps.
Diagnostic Aid #4 CRANKSHAFT POSITION
SENSOR
(MIL does not turn off during cranking)
Possible causes:
1. Crankshaft position sensor
2. Crankshaft position sensor circuit problem, pin
circuits Black 4 and Black 13.
3. Crankshaft position sensor/toothed wheel air gap
4. Toothed wheel
5. Flywheel key sheared
6. ECU
Diagnostic Aid #5 FUEL PUMP
(fuel pump not turning on)
Possible causes:
1. Main fuse
2. Fuel pump circuit problem, pin circuits Black 9
and Grey 17.
3. Fuel pump module
Diagnostic Aid #6 IGNITION SYSTEM
(no spark)
Possible causes:
1. Spark plug
2. Plug wire
3. Coil
4. Coil circuit(s), pin circuits Grey 10 and Black 1.
5. ECU grounds
Section 5
EFI Fuel System
5.37
5