Kohler COMMAND CV17-745 Service Manual page 88

Kohler Engine Parts Call K&T 606-678-9623 or 606-561-4983
Section 5B
EFI Fuel System
Code: 23
Source: ECU
Explanation: ECU is unable to recognize or process
signals from its memory.
Expected Engine
Response: Engine will not run.
Possible Causes:
1. ECU (internal memory problem).
a. Diagnosable only through the elimination of all
other system/component faults.
Code: 24 (Will not blink out)
Source: Engine Speed Sensor
Explanation: No tooth signal from speed sensor.
MIL light will not go out when
cranking.
Expected Engine
Response: None-engine will not start or run as
the ECU is unable to estimate speed.
Possible Causes:
1. Engine Speed Sensor Related
a. Sensor connector or wiring.
b. Sensor loose or air gap incorrect.
2. Speed Sensor Wheel Related
a. Damaged teeth.
b. Gap section not registering.
3. Engine Wiring Harness Related
a. Pin circuit wiring or connectors.
Pin(s) 9 and/or 10 for "24 Pin" (MSE 1.0)
Plastic-Cased ECU.
Pin(s) 9 and/or 10 for "32 Pin" (MSE 1.1)
Plastic-Cased ECU.
4. ECU/Harness Related
a. ECU-to-harness connection problem.
Code: 31
Source: Fuel Mixture or Oxygen Sensor
Explanation: "System too lean." Oxygen sensor not
sending expected voltage to ECU.
5B.34
Expected Engine
Response:
Possible Causes:
1. TPS Initialization Incorrect
a. Lean condition (check oxygen sensor signal
2. Engine Wiring Harness Related
a. Pin circuit wiring or connectors.
3. Low Fuel Pressure
4. Oxygen Sensor Related
a. Sensor connector or wiring problem.
b. Exhaust leak.
c. Poor ground path to engine (sensor is case
5. Poor system ground from ECU to engine, causing
rich running while indicating lean.
Code:
Source:
Explanation:
Expected Engine
Response:
Possible Causes:
1. Engine Wiring Harness Related
a. Pin circuit 11 wiring or connectors.
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System operates under "open loop"
control only. Until fault is detected and
registered by ECU, engine will run rich
if oxygen sensor is shorted to ground
or lean if it is shorted to battery
voltage. After fault is detected,
performance can vary, depending on
cause. If performance is pretty good,
the problem is probably with the
oxygen sensor, wiring, or connectors.
If the engine is still running rich
(laboring, short on power) or lean
(popping or misfiring), the fuel mixture
is suspect, probably incorrect TPS
initialization or low fuel pressure.
with VOA and see Oxygen Sensor section).
Pin 11 for "24 Pin" (MSE 1.0) Plastic-Cased
ECU.
Pin 20 for "32 Pin" (MSE 1.1) Plastic-Cased
ECU.
grounded).
32
Oxygen Sensor
No change in the sensor output signal.
"Open loop" operation only, may
cause a drop in system performance
and fuel efficiency.
Pin 11 for "24 Pin" (MSE 1.0) Plastic-Cased
ECU.
Pin 20 for "32 Pin" (MSE 1.1) Plastic-Cased
ECU.