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Honda:

PGM-FI MIL 9 blinks (IAT sensor) (Honda VTX1800C)

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Turn the ignition switch to "OFF".
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Disconnect the IAT sensor 2P connector. Check for loose or poor contact on the IAT sensor connector.
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Connect the IAT sensor 2P connector. Place the motorcycle on its side stand. Turn the ignition switch to "ON". Check that the MIL blinks.	Does not blink →	Loose or poor contact on the IAT sensor connector.
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9 blinks
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Turn the ignition switch to "OFF".
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Disconnect the IAT sensor 2P connector. Measure the resistance at the IAT sensor (at 20-30°C/68-86°F). Standard: 1-4 kΩ	Abnormal →	Faulty IAT sensor.
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Normal
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Turn the ignition switch to "ON".
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Measure the voltage between the terminals of the wire harness side. Connection: Gray/blue (+) - Ground (-) Standard: 4.75-5.25 V	Out of range →	Open or short circuit in the Gray/blue wire. Loose or poor contact on the ECM connectors.
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Voltage exists
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Measure the voltage between the terminals of the wire harness side. Connection: Gray/blue (+) - Green/orange (-) Standard: 4.75-5.25 V	Out of range →	Open or short circuit in the Green/orange wire. Loose or poor contact on the ECM connectors.
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Voltage exists
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Replace the ECM with a new one, and inspect it again.

See this article in russian language

Honda VTX1800C : Fuel and control system

PGM-FI MIL 8 blinks (TP sensor)
PGM-FI MIL 7 blinks (ECT sensor)
PGM-FI MIL 2 blinks (MAP sensor)
PGM-FI MIL 1 blink (MAP sensor)
PGM-FI self-diagnosis malfunction indicator failure codes
PGM-FI (programmed fuel injection) system
Fuel system diagram
Fuel system location
Troubleshooting of fuel system
Service information of fuel system

PGM-FI MIL 10 blink (BARO sensor)
PGM-FI MIL 11 blinks (vehicle speed sensor)
PGM-FI MIL 12 blinks (rear injector)
PGM-FI MIL 13 blinks (front injector)
PGM-FI MIL 18 blinks (cam pulse generator)
PGM-FI MIL 19 blinks (ignition pulse generator)
PGM-FI MIL 21 blinks (O2 sensor/California type only)
PGM-FI MIL 23 blinks (O2 sensor heater/California type only)
PGM-FI MIL 33 blinks (E2-prom)
Fuel pressure inspection

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