It may take 200 or so miles depending on how you use the truck. Please Log in or Create an account to join the conversation. That Evap System Monitor takes the longest to set. Evap system tested with smoke machine and all solenoids tested while system induced with smoke.Īnything else I am missing that I can check? Duty cycle heater control monitored with Autel. IAT, ECT, FTP, Fuel tank level sensor have been tested and functioning normal. Same results: everything is complete except EVAP, O2 and HTR. PCM reset with scan tool and vehicle was driven for another 100 miles. Hard reset has been performed with terminals disconnected from battery and both leads connected. R/L Sensor Switch Time and L/R Sensor Switch Time are Not Complete on Both banks.
The OBD II EVAP monitor on 1996 and newer vehicles runs diagnostic self-checks to detect fuel vapor leaks, and if it finds any (including a loose or missing gas cap), it will set a. Mode 6 examined and the oxygen sensors for both banks is Complete under the "Lo and Hi voltage switch time". The EVAP system usually requires no maintenance, but faults can turn on the Check Engine light and prevent a vehicle from passing an OBD II plug-in emissions test. Compared the readings to the opposite bank and nothing sticks out. He has the original box and receipt and we have confirmed part numbers with parts store. Owner replaced Bank 1 sensor 1 Denso sensor just because he "googled" it. Tested with propane induced into into intake and created vacuum leaks while monitoring the waveforms. Narrow band oxygen sensors monitored and don't seem to be biased or lazy. Fuel trim numbers at 1-6% of total correction for Bank 1 and Bank 2. Battery and charging system have been tested. No pending or active DTC's under Engine or Transmission. Is it normal for them to set a Cat before oxygen and oxygen heaters? Seems odd that a cat monitor can be passed before oxygen sensor integrity is checked, no? I don't have much experience with Chevy's. Vehicle has been driven for 300 miles with numerous trips with overnight stays for complete cool down to simulate a true cold start.Īll the other monitors are set including Catalyst. I have a 2008 Chevy Express 2500 4.8L with 200k which does not want to set the following 3 monitors Evap, oxygen and oxygen heater.