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EFI System
Never attempt to disassemble ECU. It is sealed to
prevent damage to internal components. Warranty is
void if case is opened or tampered with in any way.
All operating and control functions within ECU are
preset. No internal servicing or readjustment may
be performed. If a problem is encountered, and you
determine ECU to be faulty, contact your source of
supply.
Relationship between ECU and throttle position sensor
(TPS) is very critical to proper system operation. If TPS
or ECU is changed, or mounting position of TPS is
altered, applicable TPS Initialization Procedure must be
performed to restore synchronization.
Any service to ECU, TPS/Throttle Body (including idle
speed increase over 300 RPM), or fuel pump module
replacement should include ECU Reset.
This will clear all trouble codes, all closed loop learned
off sets, all max values, and all timers besides permanent
hour meter.
This system will NOT reset when battery is
disconnected!
ECU Reset Procedure
1. Turn key/ignition OFF.
2. Install Red wire jumper from Kohler EFI service kit
on to service port (connect white wire to black wire in
4 way diagnostic port).
3. Turn key/ignition ON, then OFF and count 10
seconds.
4. Turn key/ignition ON, then OFF and count to 10
seconds a second time.
5. Remove Red wire jumper. Turn key/ignition ON, then
OFF and count to 10 seconds a third time. ECU is
reset.
A TPS Learn Procedure must be performed after ECU
Reset.
32
TPS Learn Procedure
1. Turn idle screw clockwise one full turn prior to key/
ignition ON after 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. Restart engine, adjust idle speed down to 1500
RPM. Allow engine to dwell at 1500 RPM for about 3
seconds.
5. After this, adjust idle speed to fi nal specifi ed speed
setting.
6. Turn key/ignition OFF and count to 10 seconds.
Learn procedure is complete.
KohlerEngines.com
66 690 14 Rev. A
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