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Old 11-11-2010, 06:20 PM   #1
Av8r
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2001 L-Series 2.2L Sedan
Default Evap system monitor - 2001 L200 2.2 manual

About a week and a half ago she threw a code, P0446. I did some looking and found a small rusted through leak on the vent pipe, with a bunch of crud in it. This happened right near where it joins the rubber hose coming from the tank. I shortened the pipe about an inch, cleaned it up, and used a hose clamp to get the rubber vent hose tightly cinched around it. I've been driving it since then, but the evap system monitor is still showing incomplete. I've driven the OBDII test cycle several times, and it has still not come online. Anything I'm missing, or is there a specific # of cycles that must be driven for the system to clear?

Thank you,

Don

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Old 11-11-2010, 07:48 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: Evap system monitor - 2001 L200 2.2 manual

I'm not even going to try;

DTC P0446
The evaporative emission (EVAP) system is used to store fuel vapors as to reduce the amount of unburned fuel from escaping into the atmosphere. The EVAP system consists of the EVAP canister, fuel tank pressure sensor, EVAP lines and hoses, EVAP purge solenoid (normally closed), EVAP service port, EVAP vent solenoid (normally open), fuel tank, and PCM. The PCM monitors the EVAP system for circuit faults in the fuel tank pressure sensor, EVAP purge solenoid, and EVAP vent solenoid circuits. The PCM also monitors the EVAP system for small and large leaks. During DTC P0446 diagnostic, the EVAP purge solenoid is commanded to a fixed duty cycle (pulses valve) and the EVAP vent solenoid is commanded ON (closed) in order to build vacuum. Once vacuum is obtained, the EVAP vent solenoid is commanded OFF and the vacuum should decrease rapidly. DTC P0446 sets when the vacuum decay is too slow indicating a blocked vent system.

Important

If DTC P1640 is set, diagnose that DTC first. A short to ground causing the EVAP vent solenoid ON, will cause the vent valve to close. This will cause DTC P0446 to set.


As far as the drive cycle, the reason for not completing it is because the evap cycle never completed so the diagnostic program is stuck and will not proceed any further until DTC 0446 is resolved. Fix the problem and the very next drive cycle will most likely finish as expected. Here's an anology from one S-series post with the infamous ects/thermostat issue.

A past member posted about not passing emissions inspection due to the readiness monitors being incomplete. Her coolant sensor was replaced but the temp gauge still indicated at the 1/4 mark. A replacement thermostat was suggested. A relative (mechanic) insisted that all she had to do was drive several hundred(!?) miles to have the readiness monitors pass. This was incorrect and a month went by with no resolution and wasted mileage. After insistence from members here to ignore this mechanic and pay someone to replace the thermostat, this member heeded the advice, replaced the thermostat and shortly afterwards had the readiness monitors pass and completed state inspection. The readiness monitors simply won't proceed when stuck in error mode; any sensor not working or signal not being in the right place at the appointed time upsets the self diagnostic program making an incomplete drive cycle. With a worn out thermostat the coolant never reached the temperature the diagnostics expected so it stalled, never completing the rest of the diagnostics. No error codes were ever displayed but enough posts determined that not only the coolant sensor can cause a lack of error codes and never complete a drive cycle, a cold thermostat does the same - evading the carefully designed diagnostic system and avoid turning on the SES indicator. Its most likely that Saturn would have uncovered this easily by way of their Tech II scantool to monitor all the sensors for signals relative to engine run time. All of this is emissions related and there's a good margin of error that everything doesn't have to be perfect, just in working order.

...
*The CPS is the heart of the entire EFI system. No cps = dead EFI system*
*There's more to a/c than just a few cans of refrigerant*
*There's more to brakes than just replacing parts*

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Old 11-11-2010, 08:02 PM   #3
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2001 L-Series 2.2L Sedan
Default Re: Evap system monitor - 2001 L200 2.2 manual

Thank you Fdryer! Figured the hole on the vent pipe was the culprit, but that was probably just one of at least a couple issues. I'll post back once I have it figured out. Worst case I'll take it to a GM place and see what they can find. Never fails that this stuff happens as the weather cools down!

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