Question about 1998 Buick Century

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P0440, p1676 Evap purge solenoid problem please help!!

Hello i have a 98 century 3.1 i am working on, the problem is the computer cannot activate the evap purge solenoid on the intake, it has constant power with the Key on to the solenoid, if i try to command the solenoid open with my scanner it will not activate and usually after 2 or three attempts the computer will time out and i have to reenter, i am Not getting the ecm ground to activate the solenoid if i apply a ground with my power probe to the green/white wire it will activate, The pink wire has 12volts key on and when i plug the sensor in i get 12volts over to the green/white wire is this normal? the green white wire has continuity back to the ecm and looks ok? i think i have a bad computer driver but i am not positive , i have already replaced the evap purge solenoid thinking it was stuck it seems i have some sort of ground issue on the green/white wire because if i measure across the plug with the solenoid unplugged my meter reads 11.5 volts? battery voltage is 12.5 but the solenoid will not open unless i ground the green/white wire manually? if someone can provide a diagram of this circuit that would be very helpful otherwise i am thinking i have a bad computer driver -jeff Jjust so you know i can control the VENT solenoid with my scanner so i know that works ok

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  • jeff r
    jeff r Jul 31, 2011

    in case any one was wondering i changed the pcm and fixed this issue

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You ever fix this? think you have a bad pcm also

Posted on Sep 05, 2008

The computer in a buick is vary difficalt to figure out i would recomand on taking it in to the nearist GMC Pontiac buick dealer near u so they can do it for u

Posted on Sep 04, 2008

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My 1998 pontiac grand prix gt has A code po1676


DTC P1676 Evaporative Emission (EVAP) Purge Solenoid Control Circuit
DTC P1676 set indicates an improper voltage level has been detected on the output circuit which controls the EVAP purge solenoid.
Circuit Description
Output Driver Modules (ODMs) are used by the PCM to turn on many of the current-driven devices that are needed to control various engine and Transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the Quad Driver Modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually.
Diagnostic Aids
Check for the following conditions:
?€¢
Poor connection at the PCM.


Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.


?€¢
Damaged harness.


?€¢
Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition ON and observe a voltmeter connected between the EVAP purge solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the malfunction.

.

May 01, 2015 | Pontiac Grand Prix Cars & Trucks

3 Answers

Error code 0440 on a 2002 buick custom


Go to an auto parts store and get a Haynes repair manual for car it will have the code meanings for any and all codes on that vehicle. Only bad thing is the book cost around $30 maybe you will get lucky and one will be open and you could take a peak inside.

Mar 23, 2015 | 2002 Buick Century

1 Answer

Toyota echo won't start code 440 441 446


Error Code: P0440
Fault Location:
Evaporative Emission (EVAP) System - Malfunction
Possible Cause:
Malfunction Indicator Lamp (MIL) active.
Soution:
Check Evaporative Emission (EVAP) System Sealing.
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .

Error Code: P0441
Fault Location:
Evaporative Emission (EVAP) System - Incorrect Flow Detected
Possible Solutions:
Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
Perform Output Test.
Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .
Check Evaporative Emission (EVAP) Canister.
Perform Basic Setting.
Check Pipes between Tank Breathing and Throttle Body.

Error Code: P0446
Fault Location:
Evaporative Emission (EVAP) System, Vent Control - Circuit Malfunction
Possible Cause:
Wiring harness.
Evaporative emission (EVAP) canister purge valve.
Engine control module (ECM).

Feb 25, 2013 | 2002 Toyota ECHO

1 Answer

What is code p0440


EVAP Emission Control System Malfunction.
A code P0440 could mean one or more of the following has happened:
The gas cap is not installed or working properly The purge solenoid has failed The canister is plugged and not working properly Possible Solutions With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back. Inspect the EVAP system for cuts/holes in tubes/hoses Inspect for damaged or disconnected hoses around the Evap purge solenoid Check and/or replace the sensor Check and/or replace the purge valve Have a professional use a smoke machine to detect leaks

Sep 29, 2011 | 1997 Oldsmobile Cutlass Supreme

1 Answer

I recently purchased this 1999 Chevy Blazer and it wont pass inspection because the OBD2 Diagnostic trouble code states it's problem is, code P0440-Evaporative Emission System. The guy said it looks like...


The evaporative leak detection diagnostic strategy is based on applying a vacuum to the EVAP system and monitoring the vacuum decay rate. The VCM monitors the vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid turn ON, allowing the engine vacuum to draw a small vacuum on the entire evaporative emission system. If a sufficient vacuum level cannot be achieved, a large leak or an EVAP system malfunction is indicated.

The following conditions can cause this problem:
* A disconnected or malfunctioning fuel tank pressure sensor
* A missing, malfunctioning, improperly installed, or loose fuel cap
* A disconnected, damaged, pinched, or blocked EVAP purge line
* A disconnected or damaged EVAP vent hose
* A disconnected, damaged, pinched, or blocked fuel tank vapor line
* A disconnected or malfunctioning EVAP purge solenoid
* A disconnected or malfunctioning EVAP vent solenoid
* An open ignition feed circuit to the EVAP vent or purge solenoid
* A damaged EVAP canister
* A leaking fuel sender assembly O-ring
* A leaking fuel tank or fuel filler neck

Any of the above conditions can set a DTC P0440.

Mar 08, 2011 | 1999 Chevrolet Blazer

1 Answer

I received an engine code P0440 on a 2002 Tahoe today and my husband is inspecting the hoses, etc. and found the solenoid is installed very loose on the engine. Is this normal?


This indicates that a part of the EVAP control system is no longer fuctioning correctly.
A code P0440 could mean one or more of the following has happened:
  • The gas cap is not installed or working properly.
  • The purge solenoid has failed.
  • The canister is plugged and not working properly.
  • -----------
Evap purge solenoid should be clean and tight.Also inspect for damaged or disconnected hoses around the Evap purge solenoid. -------------- This will help.Thanks.Helpmech.

Dec 16, 2010 | Chevrolet Tahoe Cars & Trucks

1 Answer

I am getting P0440 EVAP Control System Malfunction for my Buick Century 1999 and need to know how to fix it thanks


A code P0440 could mean one or more of the following has happened:
  • The gas cap is not installed or working properly
  • The purge solenoid has failed
  • The canister is plugged and not working properly

Possible Solutions: with a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
  • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
  • Inspect the EVAP system for cuts/holes in tubes/hoses
  • Inspect for damaged or disconnected hoses around the Evap purge solenoid
  • Check and/or replace the sensor
  • Check and/or replace the purge valve
  • Have a professional use a smoke machine to detect leaks

Keep us updated.

Nov 15, 2010 | 1999 Buick Century

2 Answers

Check engine light code p1676 Chevy lumina Ltz


Trouble Code: P1676 (3.8L V6 VIN K Auto)
Evaporative Emission (EVAP) Purge Solenoid

Number of Trips to Set Code: 1
OBD II Monitor Type: CCM Details
Indicators: MIL Details
Trouble Code Conditions:
Conditions for Setting the DTC.
  • The ignition is on.
  • An improper voltage level has been detected on the output circuit which controls the EVAP purge solenoid.
  • The above conditions are present for at least 30 seconds.

Possible Causes:
  • Poor connection at the PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
  • Damaged harness.
  • Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the PCM, turn the ignition on and observe a voltmeter connected between the EVAP purge solenoid control circuit and ground at the PCM harness connector while moving connectors and wiring harnesses related to the EVAP purge solenoid. A change in voltage will indicate the location of the malfunction.

1998 Chevrolet Lumina - Powertrain - Engine Controls - 3.8L - DTC P1676 Evaporative Emission (EVAP) Purge Solenoid Control Circuit

Aug 13, 2010 | 1998 Chevrolet Lumina

1 Answer

What p0440 mean in the cars


P0440 OBD-II - Evaporative Emission Control System Malfunction


What does that mean?
This indicates that a part of the EVAP control system is no longer fuctioning correctly. The EVAP system consists of many parts, including (but not limited to) the gas cap, fuel lines, carbon canister, purge valve, and other hoses. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.



Symptoms:
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook You likely won't notice any drivability problems.



Causes:
A code P0440 could mean one or more of the following has happened:
  • The gas cap is not installed or working properly
  • The purge solenoid has failed
  • The canister is plugged and not working properly

Possible Solutions:With a P0440 OBD-II trouble code, diagnosis can be tricky at times. Here are some things to try:
  • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
  • Inspect the EVAP system for cuts/holes in tubes/hoses
  • Inspect for damaged or disconnected hoses around the Evap purge solenoid
  • Check and/or replace the sensor
  • Check and/or replace the purge valve
  • Have a professional use a smoke machine to detect leaks

Hope helps (remember rated this).

Jul 05, 2010 | 1999 Chevrolet Blazer

3 Answers

Emission control malfuction p0440


Easier said then done without professional tools

However, I'll start you will some theory, then the shop manual procedures followed by some "common" problems

Theory:
Evaporative leak detection strategy is based on applying vacuum to EVAP system and monitoring vacuum decay. Powertrain Control Module (PCM) monitors vacuum level by means of fuel tank vacuum sensor input. At a predetermined time, EVAP purge solenoid and EVAP vent solenoid are turned on. This allows engine vacuum to draw a small vacuum on entire EVAP system. Whenever a sufficient vacuum level cannot be achieved, a large leak or faulty EVAP purge solenoid is indicated.

Conditions for setting this DTC are as follows:
No TP sensor, ODM, IAT sensor, or MAP sensor DTCs present.
Start-up ECT 40-86°F (4-30°C).
Start-up ECT not greater than 14°F (8°C) greater than start-up IAT.
Start-up IAT not greater than 4°F (2°C) of start-up ECT.
Fuel tank level is 15-85 percent.
BARO is greater than 75 kPa.
Vehicle has been driven at least 11 miles.
EVAP system is unable to achieve or maintain vacuum during diagnostic test.

Diagnostic Procedures
1.) Perform On-Board Diagnostic (OBD) system check.
After performing OBD system check, go to next step.

2.) Check if DTC P1665 or P1676 is also set. If any of DTCs is present, diagnose affected DTCs. If DTCs are not present, go to next step.

3.) Turn ignition off. Remove fuel filler cap. Turn ignition on. Using scan tool, observe fuel tank pressure. If fuel tank pressure is zero in. H2O, go to next step. If fuel tank pressure in not zero in. H2O, diagnose evaporative system.

4.) Replace fuel filler cap. Using scan tool, capture FAILURE RECORD data for DTC P0440 and clear DTC. Command EVAP vent solenoid on. Connect EVAP Pressure/Purge Diagnostic Station (J-41413) to EVAP service port. Pressurize EVAP system using diagnostic station. Monitor pressure on EVAP pressure gauge on diagnostic station. If pressure is 5 in. H2O, go to next step. If pressure is not 5 in. H2O, go to step 6.

5.) Maintain EVAP pressure at 5 in. H2O. Observe fuel tank pressure on scan tool. If fuel tank pressure reading on scan tool is 5 in. H2O, go to step 8. If reading is not 5 in. H2O, go to next step.

6.) Disconnect fuel tank vapor line and EVAP purge line from EVAP canister. Block canister fitting for fuel tank pressure line. Connect a hand-held vacuum pump to canister fitting for EVAP purge line. Ensure that EVAP vent solenoid is still commanded on. Apply vacuum to EVAP canister. If vacuum can be maintained at 5 in. Hg, go to step 11. If vacuum cannot be maintained at 5 in. Hg, go to step 10.

7.) Check for restriction in fuel tank vapor line or EVAP purge line. Repair as necessary. After repairs, go to step 16. If restriction is not found, diagnose EVAP system.

8.) Disconnect vacuum source line at EVAP purge solenoid and plug vacuum source fitting on solenoid. Using scan tool's output tests function, select and activate SYSTEM PERF. Pressurize EVAP system to 5 in H2O. Observe EVAP pressure gauge on diagnostic station while removing plug from EVAP purge solenoid vacuum source fitting. If EVAP pressure decreases to zero in. H2O within 15 seconds while system performance is activated, go to next step. If EVAP pressure does not decrease to zero in. H2O within 15 seconds, go to step 13.

9.) Install vacuum gauge on EVAP diagnostic station to vacuum source line. Start and operate engine to greater than 2000 RPM. Observe source vacuum level. If vacuum level is greater than -15 in. Hg, If vacuum level is not greater than -15 in. Hg, go to step 14.

10.) Check for disconnected or damaged vent hose. Check for damaged EVAP canister. Repair as necessary. After repairs, go to step 16. If no problems are found, go to next step.

11.) Check for faulty or missing fuel filler cap. Check for disconnected or leaking fuel tank vapor line. Check for disconnected or damaged EVAP purge line. If problem is found, repair as necessary. After repairs, go to step 16. If no problems are found, go to next step.

12.) Using scan tool, command EVAP vent solenoid on. Continuously attempt to pressurize the EVAP system by leaving the EVAP diagnostic station control knob in the pressurized position. Using the Ultrasonic Leak Detector (J-41416), locate and repair leak in EVAP system. After repairs, go to step 16.

13.) Replace EVAP purge solenoid. After replacing solenoid, go to step 16.

14.) Check for carbon release into the EVAP system. Repair as necessary. After repairs, go to step 16.

15.) Replace EVAP vent solenoid. After replacing solenoid, go to next step.

15.) Turn ignition on. Using scan tool, command EVAP vent solenoid on. Using EVAP diagnostic station, pressurize EVAP system to 15 in. H2O. Move rotary switch in diagnostic station to HOLD and observe EVAP pressure gauge. If EVAP pressure decreases to less than 10 in. Hg within 2 minutes, repeat step 3. If EVAP pressure does not decrease, system is okay.

Diagnostic Aids
Check for the following:
Cracked or punctured EVAP canister.
Damaged or disconnected source vacuum line, EVAP purge line, vent hose, for fuel tank vapor line.
Poor connection at PCM.
Inspect harness connectors for backed-out terminals, improper mating, broken lock, damaged terminals, or poor wire connection.
Check for intermittent in circuit.
Check for kinked, pinched or plugged vacuum lines to EVAP purge or fuel tank vapor line. Also check for restrictions.
Faulty or damaged evaporative canister.

Apr 28, 2010 | 1999 Buick Century

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