Honda NSS250S Manual page 223

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If the engine can be started but the MIL does not
come off within a few seconds after the ignition
switch is turned ON and engine stop switch " ":
Check for the combination meter function.
• If it does not function, check the combination
meter (page 22-10).
• If it functions properly, check as follows:
MIL and DLC circuit inspection with test probe
Turn the ignition switch OFF.
Remove the left body cover (page 3-11).
Disconnect the PCM/ECM 33P (Black) connector.
Turn the ignition switch ON, the MIL should turn off.
• If the MIL turns off, replace the PCM/ECM with a
known good one, and recheck.
• If the MIL comes on, check for short circuit in the
White wire between the combination meter and
PCM/ECM as follows:
FUEL SYSTEM (PGM-FI)
NSS250S:
ECM 33P CONNECTOR
NSS250A:
PCM 33P CONNECTOR
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