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2003 CHEV K1500 4800 engine trouble code P0443 EVAP SOLENOID VALVE CONTROL CIRCUT What should I look for to repair? Thanks

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The solenoid that controls the evaporative's system valve isn't operational - you should check it first, then check the integrity of the wires that power it then finally the PCM - if it delivers the necessary power to open it.
This page, even it's for a Ford, provide very good advices on how to do just that.
http://www.asashop.org/autoinc/feb2002/techtips.htm

Posted on Oct 12, 2010

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I have a truck that popped up a P0443 code up and I've been trying to see what it is so I can get it fixed thank yo


P0443 - Evaporative Emission Control System Purge Control Valve Circuit Malfunction

Possible causes: - Faulty Evaporative Emission (EVAP) Purge Solenoid Control
- Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted
- Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection

When is the code detected? An improper voltage signal is sent to Engine Control Module (ECM) through the valve.
Possible symptoms: - Engine Light ON (or Service Engine Soon Warning Light)
P0443 Description: The Evaporative Emission System (EVAP) canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the Engine Control Module (ECM). The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

P0443 Information for specific makes: P0443 ACURA
P0443 CHRYSLER
P0443 DODGE
P0443 FORD
P0443 HONDA
P0443 INFINITI
P0443 ISUZU
P0443 JEEP
P0443 KIA
P0443 LAND-ROVER
P0443 LEXUS
P0443 MAZDA
P0443 MERCEDES-BENZ
P0443 MITSUBISHI
P0443 NISSAN
P0443 TOYOTA
P0443 Evaporative Emission Control System Purge Control Valve Circuit...

Jun 03, 2015 | Cars & Trucks

1 Answer

2004 Chevy impala code p0443, how do I correct


P0443 Evaporative Emission Control System Purge Control Valve Circuit
P0443 - Evaporative Emission Control System Purge Control Valve Circuit

Read more at: http://www.obd-codes.com/p0443
Copyright © OBD-Codes.com
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. Note: This DTC is similar to P0444 and P0445. 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: Bad purge solenoid (internal short or open) Wiring harness chafing or rubbing another component causing short or open on control circuit Connector worn, broken or shorted due to water intrusion Driver circuit inside powertrain control module (PCM) is bad Possible Solutions 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.

Read more at: http://www.obd-codes.com/p0443
Copyright © OBD-Codes.com

Apr 29, 2015 | Cars & Trucks

1 Answer

What code is po443


ossible causes
- Faulty Evaporative Emission (EVAP) Purge Solenoid Control
- Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted
- Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection
help.jpg What does this mean?
When is the code detected?
An improper voltage signal is sent to Engine Control Module (ECM) through the valve.
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0443 Description
The Evaporative Emission System (EVAP) canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the Engine Control Module (ECM). The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.

Jul 21, 2014 | 2000 Mercury Mountaineer

1 Answer

Code P0443


Error Code: P 0443
Description:
Evaporative Emission (EVAP) Canister Purge Valve - Circuit Malfunction
Problem Area:
Wiring, or VSV connector loose or detached.
Evaporative emission (EVAP) canister purge valve.

Feb 24, 2014 | 2003 Mitsubishi Montero

1 Answer

P0443 p code


Trouble Code: P0443

EVAP Purge Solenoid Circuit Fault

Possible Causes:


EVAP purge solenoid control circuit open or shorted to ground.EVAP purge solenoid power circuit open.EVAP purge solenoid is damaged or it has failed.PCM has failed.

Dec 17, 2012 | Dodge Durango Cars & Trucks

1 Answer

Failed smog test Code PO443 ck. engine light on


This is the generic definition for the code.
Your year and model may be different. Possible causes include a faulty purge control valve or the circuit back to the computer.

P0443 Description The Evaporative Emission System (EVAP) canister purge volume control solenoid valve uses a ON/OFF duty to control the flow rate of fuel vapor from the EVAP canister. The EVAP canister purge volume control solenoid valve is moved by ON/OFF pulses from the Engine Control Module (ECM). The longer the ON pulse, the greater the amount of fuel vapor that will flow through the valve.
Read more: http://engine-codes.com/p0443.html#ixzz27RdAClP2

Sep 24, 2012 | 2000 Pontiac Montana

1 Answer

How do I fix fault code po443?


P0443 INFINITI - EVAP Canister Purge Volume Control Solenoid Valve

Possible causes- EVAP control system pressure sensor
- Damage harness or connectors to the Purge Control Valve
- The valve circuit is open or shorted
- EVAP canister purge volume control solenoid valve may be faulty (The valve is stuck open)
Tech notes It's a very common problem with Infiniti vehicles. If the harness is not damaged, it's very likely that the problem is the canister purge volume control solenoid valve.


Read more: http://engine-codes.com/p0443_infiniti.html#ixzz1yqKLq8YE

Jun 25, 2012 | Infiniti J30 Cars & Trucks

1 Answer

Repair 1997 ford taures purge control valve


Well there is no one thing that causes this fault code but here are what can trigger the fault in the fuel vapor control system.
P0443 FORD - EVAP Purge Control Circuit
Possible causes- Evaporative Emission (EVAP) Purge Solenoid Control harness is open or shorted
- Evaporative Emission (EVAP) Purge Solenoid Control circuit poor electrical connection
- Faulty Evaporative Emission (EVAP) Purge Solenoid Control

Apr 17, 2012 | 1997 Ford Taurus

2 Answers

Push the gas and the engine wont rev past 2000 rpm. i have a 2002 ford escape 3.0L. i ran a diagnostic n it threw a p0443 code.


From: http://www.obd-codes.com/p0443 P0443 - Evaporative Emission Control System Purge Control Valve Circuit OBD-II Trouble Code Technical Description

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.
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook 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:

  • Bad purge solenoid (internal short or open)
  • Wiring harness chafing or rubbing another component causing short or open on control circuit
  • Connector worn, broken or shorted due to water intrusion
  • Driver circuit inside powertrain control module (PCM) is bad
Possible Solutions

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.

Mar 02, 2011 | Ford Escape Cars & Trucks

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