Kohler COMMAND CV17-745 Service Manual page 89

Kohler Engine Parts Call K&T 606-678-9623 or 606-561-4983
2. Oxygen Sensor Related
a. Sensor connector or wiring problem.
b. Sensor contaminated or damaged.
c. Sensor below the minimum operating
temperature (375°C, 709°F).
d. Poor ground path from sensor to engine
(sensor grounds through shell, see Oxygen
Sensor section).
Code: 33
Source: Oxygen Sensor/Fuel System
Explanation: "System too Rich" Temporary fuel
adaptation control is at the upper limit.
Expected Engine
Response: Erratic performance. Will run rich
(smoke).
Possible Causes:
1. Fuel Supply Related (nothing lean – only rich)
a. Restricted return line causing excessive fuel
pressure.
b. Fuel inlet screen plugged (in-tank fuel pump
only).
c. Incorrect fuel pressure at fuel rail.
2. Oxygen Sensor Related
a. Sensor connector or wiring problem.
b. Sensor contaminated or damaged.
c. Exhaust leak.
d. Poor ground path.
e. Pin circuit wiring or connectors.
Pin 11 for "24 Pin" (MSE 1.0) Plastic-Cased
ECU.
Pin 20 for "32 Pin" (MSE 1.1) Plastic-Cased
ECU.
3. TPS Sensor Related
a. Throttle plate position incorrectly set or
registered during "Initialization.''
b. TPS problem or malfunction.
4. Engine Wiring Harness Related
a. Difference in voltage between sensed voltage
(pin circuit 17 for metal-cased ECU, pin
circuit 2 for plastic-cased ECU) and actual
injector voltage (circuit 45/45A).
5. Systems Related
a. Ignition (spark plug, plug wire, ignition coil.
b. Fuel (fuel type/quality, injector, fuel pump, fuel
pressure.
c. Combustion air (air cleaner dirty/restricted,
intake leak, throttle bores).
d. Base engine problem (rings, valves).
e. Exhaust system leak.
6. ECU Related
Code:
Source:
Explanation:
Expected Engine
Response:
Possible Causes:
1. Oxygen Sensor Related
2. TPS Sensor Related
3. Engine Wiring Harness Related
4. Systems Related
www.mymowerparts.com
EFI Fuel System
f. Fuel in the crankcase oil.
g. Blocked or restricted fuel return circuit to tank.
a. ECU-to-harness connection problem.
34
Oxygen Sensor/Fuel System
Components
Long term fuel adaptation control is at
the upper or lower limit.
System operates "closed loop." No
appreciable performance loss as long
as the temporary adaptation can
provide sufficient compensation.
a. Sensor connector or wiring.
b. Sensor contaminated or damaged.
c. Exhaust leak.
d. Poor ground path.
e. Pin circuit wiring or connectors.
Pin 11 for "24 Pin" (MSE 1.0) Plastic-Cased
ECU.
Pin 20 for "32 Pin" (MSE 1.1) Plastic-Cased
ECU.
a. Throttle plate position incorrect during
"Initialization" procedure.
b. TPS problem or malfunction.
a. Difference in voltage between sensed voltage
(pin circuit 2) and actual injector voltage
(circuit 45/45A).
b. Problem in wiring harness.
c. ECU-to-harness connection problem.
a. Ignition (spark plug, plug wire, ignition coil).
b. Fuel (fuel type/quality, injector, fuel pressure,
fuel pump).
c. Combustion air (air cleaner dirty/restricted,
intake leak, throttle bores).
d. Base engine problem (rings, valves).
e. Exhaust system leak (muffler, flange, oxygen
sensor mounting boss, etc.).
f. Fuel in the crankcase oil.
g. Altitude.
h. Blocked or restricted fuel return circuit to tank.
Section 5B
5B.35