ETC keeps 1,450 RPM by retard of ignition timing in order to activate the catalyst converter under the condition that engine off time is over than 8 hour and coolant temperature is lower than 77℉.
If ETC can't keep the RPM as much as target RPM in catalyst heating range, it generates torque by throttle opening so that it keeps target RPM.
ECU shows P050B when ignition retard doesn't work even if ETC would activate retard of ignition timing by throttle opening for catalyst heating.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Ignition efficiency check | 1. Checking ECT VALVE opening and closing |
Enable Conditions |
•
Coolant temp. is higher than 15.8℉ and lower than 90℉
•
Vehicle speed is lower than 1.9MPH
•
5 sec after engine start
•
Catalyst heating is operating | |
Threshold Value |
•
Ignition angle efficiency quotient is higher than 0.2 | |
Diagnostic Time |
•
20 sec. | |
Mil On Condition |
•
Two trips |
