Kohler Command PRO ECV630 Service Manual page 28

EFI SYSTEM-ECV
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.
ECU pins are coated at factory with a thin layer of
electrical grease to prevent fretting and corrosion. Do not
attempt to remove grease from ECU pins.
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, appropriate TPS Learn 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
offsets, 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 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 ON, then OFF and count 10 seconds.
4. Turn key ON, then OFF and count to 10 seconds a
second time.
5. Remove jumper, ECU is reset. A TPS Learn
Procedure must be performed after ECU Reset.
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TPS Learn Procedure
1. Turn idle screw clockwise one full turn prior to key
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. 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 final specified speed
setting.
6. Turn key OFF and count to 10 seconds.
Learn procedure is complete.
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