Kohler Command PRO ECH630 Service Manual page 43

ECU Reset and TPS Learn Procedure
Any service to the ECU, TPS/Thrott le Body (including
idle speed increase over 300 RPM), or the fuel pump
module should include ECU Reset.
This will clear all trouble codes, all closed loop
learned off sets, all max values, and all timers besides
the permanent hour meter.
The system will NOT reset when the batt ery is
disconnected!
ECU Reset Procedure
1. Turn key OFF.
2. Install Red wire jumper (Figure 5-6) from Kohler
EFI service kit on to service port (connect the
white wire to the black wire in the 4 way
diagnostic port).
Figure 5-6. Service Port and Jumper Connector.
3. Turn key ON, then OFF and count 10 seconds.
4. Turn key ON, then OFF and count to 10 seconds a
second time.
5. Remove the jumper, ECU is reset. A TPS Learn
Procedure must be performed aft er the ECU
Reset.
TPS Learn Procedure
1. Turn idle screw clockwise one full turn prior to
key ON aft er ECU Reset.
2. Start engine, run at low idle until engine is warm.
3. Idle speed must be above 1500 RPM. If below
1500 RPM, turn idle screw up to 1700 RPM and
then shut down engine and perform ECU Reset
again.
4. Adjust idle speed down to 1500 RPM. Allow
engine to dwell at 1500 RPM for about 3 seconds.
5. Aft er this, adjust the idle speed to the fi nal
specifi ed speed sett ing.
6. Turn the key OFF and count to 10 seconds.
Learn is complete and the engine is ready for
operation.
Engine (Oil) Temperature Sensor
Figure 5-7. Engine (Oil) Temperature Sensor.
General
The engine (oil) temperature sensor (Figure 5-7)
is used by the system to help determine fuel
requirements for starting (a cold engine needs more
fuel than one at or near operating temperature).
Mounted in the breather cover, it has a temperature-
sensitive resistor that extends into the oil fl ow. The
resistance changes with oil temperature, altering the
voltage sent to the ECU. Using a table stored in its
memory, the ECU correlates the voltage drop to a
specifi c temperature. Using the fuel delivery maps,
the ECU then knows how much fuel is required for
starting at that temperature.
Service
The temperature sensor is a sealed, non-serviceable
assembly. A faulty sensor must be replaced. If a blink
code indicates a problem with the temperature sensor,
it can be tested as follows:
1. Remove the temperature sensor from the breather
cover and cap or block the sensor hole.
2. Wipe the sensor clean and allow it to reach room
temperature (25°C, 77°F).
Section 5
EFI Fuel System
Pin 1
Pin 2
5.11
5