Code P0430
Thread Starter
Instructor
Joined: Feb 2013
Posts: 219
Likes: 28
From: Sugar Land Texas
The 0443 is a “circuit” code (wiring) so you need to concentrate on wiring and not the purge valve being opened or closed…maybe check for a short to ground on the control wire (dark green/white)…remove the purge valve connector and connect the test light to battery positive or B+ on the alternator…probe the control wire while wiggling the harness as much as you can and see if the test light illuminates…look for “points of contact” where the harness passes near some metal…you can try that !!
Moderator, Tech Contributor
Joined: Sep 2013
Posts: 15,320
Likes: 3,927
From: Cape Coral, Florida
The test light should only flash if the EVAP system is doing its test when the engine is running…if the test light came on steady you probably have a short to ground…the test only runs for a short period of time…if the light flashes and you go for a 30 minute drive and then check it and it flashes again it SHOULDN’T !!…if the car has more than 3/4 of a tank or less than 1/4 the test doesn’t run…the only way I can check it is with a bidirectional scan tool…if the PCM is grounding that circuit a new purge valve won’t help you…were you doing this test with the engine running or not ??…if it was flashing with the engine not running it should not but sometimes these purge valve control wires might have a low duty cycle even with the engine off…the only way to tell is with the engine running see if you have vacuum on the fuel tank side of the purge valve.
Last edited by C5 Diag; May 15, 2023 at 04:46 PM.
