po 443
Thread Starter
4th Gear
Joined: Aug 2010
Posts: 4
Likes: 0
po 443
just ran codes and po443 showed current on my 2000 c5 ls1. this shows to be the evap. where is the evap and what do i need to do next? thanks for any help, am just an old shade tree mech. and new at this forum thang. looks like there are some good information on here. love my vette and just want that check engine light out. thanks,Skdmrks
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
DTC P0443
Circuit Description
An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge valve. The EVAP canister purge valve is pulse width modulated (PWM). The scan tool displays the amount of ON time as a percentage. The control module monitors the status of the driver. The control module controls the EVAP canister purge valve ON time by grounding the control circuit via an internal switch called a driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.
Conditions for Running the DTC
* The engine speed is more than 400 RPM.
* The system voltage is between 6-18 volts.
Conditions for Setting the DTC
* The control module detects that the commanded state of the driver and the actual state of the control circuit do not match.
* The above conditions are present for a minimum of 5 seconds.
Action Taken When the DTC Sets
* The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Circuit Description
An ignition voltage is supplied directly to the evaporative emission (EVAP) canister purge valve. The EVAP canister purge valve is pulse width modulated (PWM). The scan tool displays the amount of ON time as a percentage. The control module monitors the status of the driver. The control module controls the EVAP canister purge valve ON time by grounding the control circuit via an internal switch called a driver. If the control module detects an incorrect voltage for the commanded state of the driver, this DTC sets.
Conditions for Running the DTC
* The engine speed is more than 400 RPM.
* The system voltage is between 6-18 volts.
Conditions for Setting the DTC
* The control module detects that the commanded state of the driver and the actual state of the control circuit do not match.
* The above conditions are present for a minimum of 5 seconds.
Action Taken When the DTC Sets
* The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
* The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.
Burning Brakes
Joined: Jan 2006
Posts: 1,170
Likes: 27
From: Magnolia Greens NC
DTC P0442 Evaporative Emission (EVAP) System Small Leak Detected
DTC P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
442's are most likely to be the gas cap.........but, it's worth a try..."tighten or replace the gas cap"...erase code & wait & see if it returns....btw, you can still drive it without any problem with a 443 code...
DTC P0443 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
442's are most likely to be the gas cap.........but, it's worth a try..."tighten or replace the gas cap"...erase code & wait & see if it returns....btw, you can still drive it without any problem with a 443 code...
Thread Starter
4th Gear
Joined: Aug 2010
Posts: 4
Likes: 0
fixed (evap) evaporative emission purge solenoid today. took fuel rail cover off, looked at solenoid and there it was. the wires going to it looked like a rat chewed them into. spliced wires back together cleared the po443c code and now seems to be good to go. it idles better and no more smutty tail pipes. thanks for all your help.
