No power going throug the wires to purge valve solenoids checked for ground on green wire nothing nada what can it be
Check for blown fuses
SOURCE: I have a 1998 Cadillac
the pcm wont purge the solenoid if you're idling. rev up the motor a bit, its not a for sure thing the pcm will command it in park either, u may have to drive it and check it. the guys at the shop can activate it with there scan tool too. check those filler tubes carefully, if the shop smoked it from the port, sometimes it wont fill the filler neck. sometimes u cant see the smoke. look down inside the tube and check for cracks, esp if its plastic.
SOURCE: Had 02 cadillac deville checked the p0443 code
Check the vaccum hoses for the valves and make sure there is a tight connection and check for air leaks, all it takes is a pin hole in a hose to foul up the system.
P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL) illumination. There may be no drivability problems at all. But, it's also possible to have a lean condition or a rough running engine if the purge valve is stuck open. Usually though, these symptoms are accompanied by other EVAP codes. Another symptom may be excessive pressure in the gas tank in the form of a "whooshing" sound when the cap is removed, indicating a purge valve that isn't working at all or stuck closed.
To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
1. Using a scan tool, command the purge solenoid to activate. Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly.
2. If it doesn't click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. Then check for battery voltage on the feed wire with the key on. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If it doesn't click when you manually ground it, replace the purge solenoid.
3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You'll need a new ECM. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it.
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Evaporative Emission Control System Purge Control Valve Circuit
What does that mean?
The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter
the engine to be burned, rather than vented into the atmosphere as an emission.
The purge valve solenoid is supplied switched battery voltage. The ECM controls
the valve by operating the ground circuit, opening the purge valve at specific
times allowing these gasses to enter the engine. The ECM monitors the ground
circuit as well, watching for faults. When the purge solenoid isn't activated,
the ECM should see a high voltage on the ground circuit. When the solenoid is
activated, the ECM should see the ground voltage pulled low, close to zero.
If the ECM doesn't see these expected voltages, or senses an open in the circuit,
this code is set.
Potential Symptoms
P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL)
illumination. There may be no drivability problems at all. But, it's also possible
to have a lean condition or a rough running engine if the purge valve is stuck
open. Usually though, these symptoms are accompanied by other EVAP codes. Another
symptom may be excessive pressure in the gas tank in the form of a "whooshing"
sound when the cap is removed, indicating a purge valve that isn't working at
all or stuck closed.
Causes
To cause a P0443, there has to be a problem with the purge control CIRCUIT,
not necessarily the valve. Usually they are a unit housing the valve and the
solenoid as an assembly. Or it could be comprised of a separate solenoid with
vacuum lines to a purge valve. That said, it could be any of the following:
how to fix follow these steps
1. Using a scan tool, command the purge
solenoid to activate. Listen or feel for a clicking coming from the purge
solenoid. It should click once, or on some models it may click repeatedly.
2. If it doesn't click with scan tool
activation, unplug the connector and examing the solenoid and connector for
damage, water, etc. Then check for battery voltage on the feed wire with the key
on. If you have battery voltage, then ground the control side manually using a
jumper wire and see if the valve clicks. If it does, then you know the solenoid
is working properly but there is a problem with the control circuit. If it
doesn't click when you manually ground it, replace the purge solenoid.
3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You'll need a new ECM. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it.
Evaporative Emission Control System Purge Control Valve Circuit
What does that mean?
The Evaporative Emissions System (EVAP) allows fumes from the gas tank to enter the engine to be burned, rather than vented into the atmosphere as an emission. The purge valve solenoid is supplied switched battery voltage. The ECM controls the valve by operating the ground circuit, opening the purge valve at specific times allowing these gasses to enter the engine. The ECM monitors the ground circuit as well, watching for faults. When the purge solenoid isn't activated, the ECM should see a high voltage on the ground circuit. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. If the ECM doesn't see these expected voltages, or senses an open in the circuit, this code is set.
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Potential Symptoms
P0443 trouble code symptoms could be just an malfunction indicator lamp (MIL) illumination. There may be no drivability problems at all. But, it's also possible to have a lean condition or a rough running engine if the purge valve is stuck open. Usually though, these symptoms are accompanied by other EVAP codes. Another symptom may be excessive pressure in the gas tank in the form of a "whooshing" sound when the cap is removed, indicating a purge valve that isn't working at all or stuck closed.
Causes
To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. Usually they are a unit housing the valve and the solenoid as an assembly. Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. That said, it could be any of the following:
1. Using a scan tool, command the purge solenoid to activate. Listen or feel for a clicking coming from the purge solenoid. It should click once, or on some models it may click repeatedly.
2. If it doesn't click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. Then check for battery voltage on the feed wire with the key on. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If it doesn't click when you manually ground it, replace the purge solenoid.
3. To check for a problem on the control circuit (if the solenoid tests okay and you have voltage to the solenoid) plug the solenoid back in and remove the control circuit (ground) wire from the ECM connector (If you're unsure how to do this, do not attempt). With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. The solenoid should click. If it does, then you know there is no problem with the control wire to the solenoid and there is a problem with the ECM purge solenoid driver circuit in the ECM. You'll need a new ECM. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. You must find it and repair it.
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