Kohler PCH680 / PCH740 — ECU Reset Procedure

Testing & diagnosis · Electronic Control Unit (ECU)

For the Kohler PCH680 / PCH740, from the Kohler service manual.

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Procedure

1. Turn key/ignition OFF.
2. Install Red wire jumper from Kohler EFI service kit onto 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.
6. Turn key/ignition ON, then OFF and count to 10 seconds a third time. ECU is reset.

Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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