P0452 Chevrolet -solution

Question

1. How to diagnose a p0452

Answer 1

P0452 Evaporative emission control system pressure sensor low

To diagnose this the use of a scan tool or voltmeter will work, The code is due to the pressure sensor signal voltage is low.(0.1).and the condition is more than 5 seconds. If you use a scan tool you will need to jump the 5 volt reference to the FTP signal wire, if the scan tool show 5 volts reapir for poor connection,if it does not show a 5 volt inspect for a short to ground at the harness.Without a scan tool measure the 5 volt refernce (with the FTP disconnected key on engine off) if it is below 4.7 volts inspect the harness and the PCM connection, A PCM may be required.