Kohler — Reading Fault Codes (Blink Codes)
Testing & diagnosis · EFI ECU / MIL
From a Kohler service manual covering: LH630, LH685, LH750, LH760. Check it applies to your exact model before use.
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Procedure
- Start with key switch off.
- Turn key on-off-on-off-on, leaving on in third sequence within 2.5 seconds.
- Observe MIL blinks: first digit, pause, second digit.
- Write down codes as they appear.
- Code 61 is always last and indicates end of transmission.
- To clear codes, disconnect negative battery cable or main ECU fuse for about 1 minute.
- Reconnect and run engine several minutes; MIL should remain off if corrected.
Tools required
- None
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.