Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.Junkyard Gem: 2001 Chevrolet Venture Warner Brothers Edition It came with a built-in VHS videocassette player and Bugs Bunny badging.ĭuring the late 1990s, minivan manufacturers began installing airliner-style flip-down video displays in their vehicles, theoretically allowing the grownups in the front seats to sedate the kids with video entertainment on long road trips. If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). Evap vent valve is usually supplied Batt. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. P0446 - Evaporative Emission Control System Vent Control Circuit MalfunctionĮvap vent valve has only one purpose. However if it doesn't click, then there must be an open in the wiring between the ECM and and the solenoid. 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. With the ground wire removed from the ECM, turn the key on and then manually ground the Purge valve control wire. 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). If it doesn't click when you manually ground it, replace the purge solenoid.ģ. If it does, then you know the solenoid is working properly but there is a problem with the control circuit. If you have battery voltage, then ground the control side manually using a jumper wire and see if the valve clicks. Then check for battery voltage on the feed wire with the key on. If it doesn't click with scan tool activation, unplug the connector and examing the solenoid and connector for damage, water, etc. It should click once, or on some models it may click repeatedly.Ģ. Listen or feel for a clicking coming from the purge solenoid. Using a scan tool, command the purge solenoid to activate. Wiring harness chafing or rubbing another component causing short or open on control circuitĬonnector worn, broken or shorted due to water intrusionĭriver circuit inside powertrain control module (PCM) is badġ. That said, it could be any of the following:īad purge solenoid (internal short or open) Or it could be comprised of a separate solenoid with vacuum lines to a purge valve. Usually they are a unit housing the valve and the solenoid as an assembly. If the ECM doesn't see these expected voltages, or senses an open in the circuit, this code is set.Ĭauses: To cause a P0443, there has to be a problem with the purge control CIRCUIT, not necessarily the valve. When the solenoid is activated, the ECM should see the ground voltage pulled low, close to zero. When the purge solenoid isn't activated, the ECM should see a high voltage on the ground circuit. The ECM monitors the ground circuit as well, watching for faults. 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 purge valve solenoid is supplied switched battery voltage. 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. P0443 - Evaporative Emission Control System Purge Control Valve Circuit Install the loop end of the adjuster spring to the adjuster actuator. Install the straight end of the adjuster spring into the secondary Park brake actuator (3), and the adjuster actuator (1) properly. Important: Ensure that the adjuster (2) engages the brake shoes (4 and 5), the In order to spread the brake shoes apart. Remove the straight end of the adjuster spring from the secondary Remove the loop end of the adjuster spring from the adjuster actuator. Notice: Do not over stretch the adjuster spring. SOURCE: rear brakes scrubbing on 1998 chevy venture vanĬaution: Keep fingers away from rear brake shoe springs to prevent fingers fromīeing pinched between spring and shoe web or spring and backing plate.
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