| Turn the ignition switch to "OFF". | ||
| ↓ | ||
| Disconnect the О2 sensor 4P connector. Check for loose or poor contact on the O2 sensor 4P connector.  | ||
| ↓ | ||
| Disconnect the ECM connectors. Connect the test harness to ECM connectors.  | ||
| ↓ | ||
Check the continuity between the test harness terminal and O2 sensor 4P connector terminal. Connection: White/orange - B5 Standard: Continuity | No continuity → | Open circuit in O2 sensor White/orange wire. |
| ↓ | ||
| Continuity | ||
| ↓ | ||
Check the continuity between the O2 sensor 4P connector terminal and ground. Connection: White/orange - Ground Standard: No continuity | Continuity → | Short circuit in Oz sensor White/orange wire. |
| ↓ | ||
| No continuity | ||
| ↓ | ||
| Connect the O2 sensor connector. Turn the ignition switch to "ON" and warm up the engine until the coolant temperature is 80°C (176°F).  | ||
| ↓ | ||
| Operate the throttle grip and snap the engine speed from idle to 5,000 rpm. | ||
| ↓ | ||
Check the voltage between the test harness terminals. Connection: А22 - В5 Standard: With the throttle fully open: 0.6 V minimum With the throttle quickly closed: 0.4 V maximum | Out of range → | Faulty O2 sensor. |
| ↓ | ||
| Normal | ||
| ↓ | ||
| Check the fuel supply system, if the system is correct, replace the ECM and inspect again. |
Honda:
PGM-FI MIL 21 blinks (O2 sensor/California type only) (Honda VTX1800C)
See this article in russian language
PGM-FI MIL 19 blinks (ignition pulse generator)
PGM-FI MIL 18 blinks (cam pulse generator)
PGM-FI MIL 13 blinks (front injector)
PGM-FI MIL 12 blinks (rear injector)
PGM-FI MIL 11 blinks (vehicle speed sensor)
PGM-FI MIL 10 blink (BARO sensor)
PGM-FI MIL 9 blinks (IAT sensor)
PGM-FI MIL 8 blinks (TP sensor)
PGM-FI MIL 7 blinks (ECT sensor)
PGM-FI MIL 2 blinks (MAP sensor)
PGM-FI MIL 18 blinks (cam pulse generator)
PGM-FI MIL 13 blinks (front injector)
PGM-FI MIL 12 blinks (rear injector)
PGM-FI MIL 11 blinks (vehicle speed sensor)
PGM-FI MIL 10 blink (BARO sensor)
PGM-FI MIL 9 blinks (IAT sensor)
PGM-FI MIL 8 blinks (TP sensor)
PGM-FI MIL 7 blinks (ECT sensor)
PGM-FI MIL 2 blinks (MAP sensor)
PGM-FI MIL 23 blinks (O2 sensor heater/California type only)
PGM-FI MIL 33 blinks (E2-prom)
Fuel pressure inspection
Fuel flow inspection
Fuel pump — removal and installation
Fuel cut-off relay
Fuel tank — removal and installation
Air cleaner housing — removal and installation
Throttle body removal
Intake manifold removal
PGM-FI MIL 33 blinks (E2-prom)
Fuel pressure inspection
Fuel flow inspection
Fuel pump — removal and installation
Fuel cut-off relay
Fuel tank — removal and installation
Air cleaner housing — removal and installation
Throttle body removal
Intake manifold removal
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