Conditions for Setting the DTC
- DTC P0621 is not set.
- Ignition ON, engine OFF (Prior to Ignition ON, the ignition must have been OFF for at least 5 s), the ECM detects a PWM signal that is greater than 65% for 5 s
- Engine running at less than 3, 000 RPM - The ECM detects a PWM signal that is less than 5% for 30 s