Step 8: replace the fuel injector, retest and solve the error.
Since the fuel injector belongs to the actuator on the engine, we can’t judge whether there is a error inside the actuator by reading the data flow and action test with the decoder. This fault belongs to the mechanical fault of the fuel injector and can’t be checked with the diagnostic equipment.
Summary: we must have our own ideas when troubleshooting. Like this error, we should first eliminate the faults of circuit sensors, and then solve other faults, and preliminarily judge whether there is a problem in the oil circuit. We don’t need to spend time and effort to check the low-voltage oil circuit, oil metering unit, etc.