What is "EVAP" System??? Computer threw about 4 EVAP codes...
09-08-2002, 01:53 AM
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What is "EVAP" System??? Computer threw about 4 EVAP codes... Car started putting then stalled after some spray...Hooked up tech 2 and got like 4 EVAP codes, what is the system and what does it do?
09-08-2002, 10:23 AM
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Re: What is "EVAP" System??? Computer threw about 4 EVAP codes... Instead of venting the gas tank to the atmospere it is a sealed system. These are strait hydrocarbon emissions ,and they use a carchol canister to store these built up vapors & the pcm uses a soleniod to pull the vapors into motor via a vacuum line. There is also a purge flow sensor that the pcm uses to check the system. The most common problem is a gas cap loose. If anything is disconnected or leaking it will set codes.
09-08-2002, 10:31 AM
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Re: What is "EVAP" System??? Computer threw about 4 EVAP codes... Here are all the codes I got....
P0141-HO2S Heater Performance Bank 1 Sensor 2
P0440-Evaporative Emission (EVAP) System
P0442- Evaporative Emission (EVAP) System Small Leak Detected
P0446- EVAP Vent Solenoid Valve Control System
P1441-Evaporative Emission (EVAP) System Flow During Non-Purge
P0141-HO2S Heater Performance Bank 1 Sensor 2
P0440-Evaporative Emission (EVAP) System
P0442- Evaporative Emission (EVAP) System Small Leak Detected
P0446- EVAP Vent Solenoid Valve Control System
P1441-Evaporative Emission (EVAP) System Flow During Non-Purge
09-08-2002, 10:35 AM
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Re: What is "EVAP" System??? Computer threw about 4 EVAP codes... Gas cap is tight...Do you know which vacuum line it uses to get into the intake?
09-08-2002, 06:04 PM
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Re: What is "EVAP" System??? Computer threw about 4 EVAP codes... Is this car modified lightend or pieces changed? That's alot of evaportive system codes all at once.
09-08-2002, 08:37 PM
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Re: What is "EVAP" System??? Computer threw about 4 EVAP codes... Does your car still have the original emission sticker w/vacuum routing diagram? Use that to help you check it out. + there are lines runing from carchol canister back to gas tank this entire system must be sealed for a good purge flow sensor to inform the pcm of a pass condition for the evap system. Hope this helps.
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09-10-2002, 11:39 AM
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Re: What is "EVAP" System??? Computer threw about 4 EVAP codes... EVAP System:
The Evaporative Emission (EVAP) Control system used on all vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is operating, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
The evaporative system includes the following components:
*Fuel tank
*Evaporative emission canister vent solenoid
*Fuel tank pressure sensor
*Fuel pipes and hoses
*Vapor lines
*Fuel cap
*Evaporative emission canister
*Purge lines
*Purge valve solenoid
EVAP System Operation:
The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). The EVAP purge solenoid control is Pulse Width Modulated (PWM) or turned on and off several times a second.
The EVAP canister purge PWM duty cycle varies according to the operating conditions determined by the mass air flow, the fuel trim, the engine coolant temperature, and the intake air temperature. For certain EVAP tests, the diagnostic will be disabled if the TP angle increases to above 75% .
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring for vacuum decay.
The fuel level sensor input to the PCM is used to determine if the fuel level in the tank is correct to run the EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85% .
The PCM monitors the fuel tank pressure/vacuum level via the fuel tank pressure sensor input.
Results of Incorrect Operation:
Poor idle, stalling and poor driveability can be caused by the following:
*Malfunctioning purge solenoid.
*Damaged canister.
*Hoses/lines split, cracked and/or not connected properly.
Evidence of fuel loss or fuel vapor odor can be caused by the following:
*Liquid fuel leaking from the fuel lines
*Cracked or damaged canister
*Inoperative canister control valve
Vacuum hoses that are:
*Disconnected
*Mis-routed
*Kinked
*Deteriorated
*Damaged
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay.
The PCM monitors vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid are turned on, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. After the desired vacuum level has been achieved, the EVAP purge solenoid is turned off, sealing the system. A leak is detected by monitoring for a decrease in vacuum level over a given time period, all other variables remaining constant. A small leak in the system causes DTC P0442 to be set.
If the desired vacuum level cannot be achieved in the test described above, a large leak or a faulty EVAP purge solenoid is indicated. This can be caused by the following conditions:
*Disconnected or faulty fuel tank pressure sensor.
*Missing or faulty fuel cap.
*Disconnected, damaged, pinched, or blocked EVAP purge line.
*Disconnected or damaged EVAP vent hose.
*Disconnected, damaged, pinched, or blocked fuel tank vapor line.
*Disconnected or faulty EVAP canister solenoid.
*Disconnected or faulty EVAP vent solenoid.
*Open ignition feed circuit to the EVAP vent or purge solenoid.
*Damaged EVAP canister.
Any of the above conditions sets DTC P0440. A restricted or blocked EVAP canister vent path is detected by drawing vacuum into the EVAP system. The PCM turns off the EVAP vent solenoid and the EVAP purge solenoid (EVAP vent solenoid Open, EVAP purge PWM 0% ). The PCM monitors the fuel tank pressure sensor input. With the EVAP vent solenoid open, any vacuum in the system should decrease quickly unless the vent is blocked. A blockage is caused by the following conditions:
*Faulty EVAP vent solenoid (stuck closed).
*Plugged, kinked, or pinched vent hose.
*Shorted EVAP vent solenoid driver circuit.
*Plugged evaporative canister.
If any of the above conditions are present, DTC P0446 sets.
The PCM checks for conditions that cause the EVAP system to purge continuously by commanding the EVAP vent solenoid on and the EVAP purge solenoid off (EVAP vent solenoid CLOSED, EVAP purge PWM 0% ). If fuel tank pressure level increases during the test, a continuous purge flow condition is indicated. This can be caused by the following conditions:
*EVAP purge solenoid leaking.
*EVAP purge and engine vacuum source lines switched at the EVAP purge solenoid.
*EVAP purge solenoid driver circuit grounded.
If any of the above conditions are present, DTC P1441 sets.
Refer to the appropriate DTCs for further diagnostic procedures regarding the EVAP system.
Visual Check of Evaporative Emission Canister
*Cracked or damaged, replace the canister.
*Fuel leaking from the canister, replace canister and check lines and line routing.
Here's everything I could find on the EVAP system. Will email diagram also.
The Evaporative Emission (EVAP) Control system used on all vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is operating, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
The evaporative system includes the following components:
*Fuel tank
*Evaporative emission canister vent solenoid
*Fuel tank pressure sensor
*Fuel pipes and hoses
*Vapor lines
*Fuel cap
*Evaporative emission canister
*Purge lines
*Purge valve solenoid
EVAP System Operation:
The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). The EVAP purge solenoid control is Pulse Width Modulated (PWM) or turned on and off several times a second.
The EVAP canister purge PWM duty cycle varies according to the operating conditions determined by the mass air flow, the fuel trim, the engine coolant temperature, and the intake air temperature. For certain EVAP tests, the diagnostic will be disabled if the TP angle increases to above 75% .
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring for vacuum decay.
The fuel level sensor input to the PCM is used to determine if the fuel level in the tank is correct to run the EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85% .
The PCM monitors the fuel tank pressure/vacuum level via the fuel tank pressure sensor input.
Results of Incorrect Operation:
Poor idle, stalling and poor driveability can be caused by the following:
*Malfunctioning purge solenoid.
*Damaged canister.
*Hoses/lines split, cracked and/or not connected properly.
Evidence of fuel loss or fuel vapor odor can be caused by the following:
*Liquid fuel leaking from the fuel lines
*Cracked or damaged canister
*Inoperative canister control valve
Vacuum hoses that are:
*Disconnected
*Mis-routed
*Kinked
*Deteriorated
*Damaged
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay.
The PCM monitors vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid are turned on, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. After the desired vacuum level has been achieved, the EVAP purge solenoid is turned off, sealing the system. A leak is detected by monitoring for a decrease in vacuum level over a given time period, all other variables remaining constant. A small leak in the system causes DTC P0442 to be set.
If the desired vacuum level cannot be achieved in the test described above, a large leak or a faulty EVAP purge solenoid is indicated. This can be caused by the following conditions:
*Disconnected or faulty fuel tank pressure sensor.
*Missing or faulty fuel cap.
*Disconnected, damaged, pinched, or blocked EVAP purge line.
*Disconnected or damaged EVAP vent hose.
*Disconnected, damaged, pinched, or blocked fuel tank vapor line.
*Disconnected or faulty EVAP canister solenoid.
*Disconnected or faulty EVAP vent solenoid.
*Open ignition feed circuit to the EVAP vent or purge solenoid.
*Damaged EVAP canister.
Any of the above conditions sets DTC P0440. A restricted or blocked EVAP canister vent path is detected by drawing vacuum into the EVAP system. The PCM turns off the EVAP vent solenoid and the EVAP purge solenoid (EVAP vent solenoid Open, EVAP purge PWM 0% ). The PCM monitors the fuel tank pressure sensor input. With the EVAP vent solenoid open, any vacuum in the system should decrease quickly unless the vent is blocked. A blockage is caused by the following conditions:
*Faulty EVAP vent solenoid (stuck closed).
*Plugged, kinked, or pinched vent hose.
*Shorted EVAP vent solenoid driver circuit.
*Plugged evaporative canister.
If any of the above conditions are present, DTC P0446 sets.
The PCM checks for conditions that cause the EVAP system to purge continuously by commanding the EVAP vent solenoid on and the EVAP purge solenoid off (EVAP vent solenoid CLOSED, EVAP purge PWM 0% ). If fuel tank pressure level increases during the test, a continuous purge flow condition is indicated. This can be caused by the following conditions:
*EVAP purge solenoid leaking.
*EVAP purge and engine vacuum source lines switched at the EVAP purge solenoid.
*EVAP purge solenoid driver circuit grounded.
If any of the above conditions are present, DTC P1441 sets.
Refer to the appropriate DTCs for further diagnostic procedures regarding the EVAP system.
Visual Check of Evaporative Emission Canister
*Cracked or damaged, replace the canister.
*Fuel leaking from the canister, replace canister and check lines and line routing.
Here's everything I could find on the EVAP system. Will email diagram also.
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Flaggdies (01-05-2022)
08-06-2005, 11:43 PM
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How about a P0447? Anyone know what this one is about? I know it is Evaporative Emission Control System Vent Control Circuit Open, but how do I fix it. I am leaning towards a relay whick goes connected to the fuel pump some how. I think it might be broken. Anyone?
08-08-2005, 09:07 AM
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Given the combination of codes & drivability ("putting"?)
I'd be looking for a vacuum leak about the EVAP solenoid
whatchamacallits that are up on the driver's side valve
cover. But nitrous' relation to all this might be a backfire
event that blew off a vacuum line, or just made a bad
enough vacuum leak somewhere else that the EVAP
self-check stuff just won't run clean.
I'd be looking for a vacuum leak about the EVAP solenoid
whatchamacallits that are up on the driver's side valve
cover. But nitrous' relation to all this might be a backfire
event that blew off a vacuum line, or just made a bad
enough vacuum leak somewhere else that the EVAP
self-check stuff just won't run clean.
09-19-2005, 09:51 PM
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09-10-2002, 09:39 AM #10
jgkinsofla
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Join Date: Aug 2002
Location: Florida
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Trader Rating: (0) Re: What is "EVAP" System??? Computer threw about 4 EVAP codes...
--------------------------------------------------------------------------------
EVAP System:
The Evaporative Emission (EVAP) Control system used on all vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is operating, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
The evaporative system includes the following components:
*Fuel tank
*Evaporative emission canister vent solenoid
*Fuel tank pressure sensor
*Fuel pipes and hoses
*Vapor lines
*Fuel cap
*Evaporative emission canister
*Purge lines
*Purge valve solenoid
EVAP System Operation:
The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). The EVAP purge solenoid control is Pulse Width Modulated (PWM) or turned on and off several times a second.
The EVAP canister purge PWM duty cycle varies according to the operating conditions determined by the mass air flow, the fuel trim, the engine coolant temperature, and the intake air temperature. For certain EVAP tests, the diagnostic will be disabled if the TP angle increases to above 75% .
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring for vacuum decay.
The fuel level sensor input to the PCM is used to determine if the fuel level in the tank is correct to run the EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85% .
The PCM monitors the fuel tank pressure/vacuum level via the fuel tank pressure sensor input.
Results of Incorrect Operation:
Poor idle, stalling and poor driveability can be caused by the following:
*Malfunctioning purge solenoid.
*Damaged canister.
*Hoses/lines split, cracked and/or not connected properly.
Evidence of fuel loss or fuel vapor odor can be caused by the following:
*Liquid fuel leaking from the fuel lines
*Cracked or damaged canister
*Inoperative canister control valve
Vacuum hoses that are:
*Disconnected
*Mis-routed
*Kinked
*Deteriorated
*Damaged
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay.
The PCM monitors vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid are turned on, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. After the desired vacuum level has been achieved, the EVAP purge solenoid is turned off, sealing the system. A leak is detected by monitoring for a decrease in vacuum level over a given time period, all other variables remaining constant. A small leak in the system causes DTC P0442 to be set.
If the desired vacuum level cannot be achieved in the test described above, a large leak or a faulty EVAP purge solenoid is indicated. This can be caused by the following conditions:
*Disconnected or faulty fuel tank pressure sensor.
*Missing or faulty fuel cap.
*Disconnected, damaged, pinched, or blocked EVAP purge line.
*Disconnected or damaged EVAP vent hose.
*Disconnected, damaged, pinched, or blocked fuel tank vapor line.
*Disconnected or faulty EVAP canister solenoid.
*Disconnected or faulty EVAP vent solenoid.
*Open ignition feed circuit to the EVAP vent or purge solenoid.
*Damaged EVAP canister.
Any of the above conditions sets DTC P0440. A restricted or blocked EVAP canister vent path is detected by drawing vacuum into the EVAP system. The PCM turns off the EVAP vent solenoid and the EVAP purge solenoid (EVAP vent solenoid Open, EVAP purge PWM 0% ). The PCM monitors the fuel tank pressure sensor input. With the EVAP vent solenoid open, any vacuum in the system should decrease quickly unless the vent is blocked. A blockage is caused by the following conditions:
*Faulty EVAP vent solenoid (stuck closed).
*Plugged, kinked, or pinched vent hose.
*Shorted EVAP vent solenoid driver circuit.
*Plugged evaporative canister.
If any of the above conditions are present, DTC P0446 sets.
The PCM checks for conditions that cause the EVAP system to purge continuously by commanding the EVAP vent solenoid on and the EVAP purge solenoid off (EVAP vent solenoid CLOSED, EVAP purge PWM 0% ). If fuel tank pressure level increases during the test, a continuous purge flow condition is indicated. This can be caused by the following conditions:
*EVAP purge solenoid leaking.
*EVAP purge and engine vacuum source lines switched at the EVAP purge solenoid.
*EVAP purge solenoid driver circuit grounded.
If any of the above conditions are present, DTC P1441 sets.
Refer to the appropriate DTCs for further diagnostic procedures regarding the EVAP system.
Visual Check of Evaporative Emission Canister
*Cracked or damaged, replace the canister.
*Fuel leaking from the canister, replace canister and check lines and line routing.
Here's everything I could find on the EVAP system. Will email diagram also.
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09-10-2002, 09:39 AM #10
jgkinsofla
Staging Lane
Join Date: Aug 2002
Location: Florida
Posts: 53
Trader Rating: (0) Re: What is "EVAP" System??? Computer threw about 4 EVAP codes...
--------------------------------------------------------------------------------
EVAP System:
The Evaporative Emission (EVAP) Control system used on all vehicles is the charcoal canister storage method. This method transfers fuel vapor from the fuel tank to an activated carbon (charcoal) storage device (canister) to hold the vapors when the vehicle is not operating. When the engine is operating, the fuel vapor is purged from the carbon element by intake air flow and consumed in the normal combustion process.
The evaporative system includes the following components:
*Fuel tank
*Evaporative emission canister vent solenoid
*Fuel tank pressure sensor
*Fuel pipes and hoses
*Vapor lines
*Fuel cap
*Evaporative emission canister
*Purge lines
*Purge valve solenoid
EVAP System Operation:
The EVAP purge solenoid valve allows manifold vacuum to purge the canister. The Powertrain Control Module (PCM) supplies a ground to energize the EVAP purge solenoid valve (purge on). The EVAP purge solenoid control is Pulse Width Modulated (PWM) or turned on and off several times a second.
The EVAP canister purge PWM duty cycle varies according to the operating conditions determined by the mass air flow, the fuel trim, the engine coolant temperature, and the intake air temperature. For certain EVAP tests, the diagnostic will be disabled if the TP angle increases to above 75% .
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring for vacuum decay.
The fuel level sensor input to the PCM is used to determine if the fuel level in the tank is correct to run the EVAP diagnostic tests. To ensure sufficient volume in the tank to begin the various diagnostic tests, the fuel level must be between 15% and 85% .
The PCM monitors the fuel tank pressure/vacuum level via the fuel tank pressure sensor input.
Results of Incorrect Operation:
Poor idle, stalling and poor driveability can be caused by the following:
*Malfunctioning purge solenoid.
*Damaged canister.
*Hoses/lines split, cracked and/or not connected properly.
Evidence of fuel loss or fuel vapor odor can be caused by the following:
*Liquid fuel leaking from the fuel lines
*Cracked or damaged canister
*Inoperative canister control valve
Vacuum hoses that are:
*Disconnected
*Mis-routed
*Kinked
*Deteriorated
*Damaged
The evaporative leak detection diagnostic strategy is based on applying vacuum to the EVAP system and monitoring vacuum decay.
The PCM monitors vacuum level via the fuel tank pressure sensor input. At an appropriate time, the EVAP purge solenoid and the EVAP vent solenoid are turned on, allowing engine vacuum to draw a small vacuum on the entire evaporative emission system. After the desired vacuum level has been achieved, the EVAP purge solenoid is turned off, sealing the system. A leak is detected by monitoring for a decrease in vacuum level over a given time period, all other variables remaining constant. A small leak in the system causes DTC P0442 to be set.
If the desired vacuum level cannot be achieved in the test described above, a large leak or a faulty EVAP purge solenoid is indicated. This can be caused by the following conditions:
*Disconnected or faulty fuel tank pressure sensor.
*Missing or faulty fuel cap.
*Disconnected, damaged, pinched, or blocked EVAP purge line.
*Disconnected or damaged EVAP vent hose.
*Disconnected, damaged, pinched, or blocked fuel tank vapor line.
*Disconnected or faulty EVAP canister solenoid.
*Disconnected or faulty EVAP vent solenoid.
*Open ignition feed circuit to the EVAP vent or purge solenoid.
*Damaged EVAP canister.
Any of the above conditions sets DTC P0440. A restricted or blocked EVAP canister vent path is detected by drawing vacuum into the EVAP system. The PCM turns off the EVAP vent solenoid and the EVAP purge solenoid (EVAP vent solenoid Open, EVAP purge PWM 0% ). The PCM monitors the fuel tank pressure sensor input. With the EVAP vent solenoid open, any vacuum in the system should decrease quickly unless the vent is blocked. A blockage is caused by the following conditions:
*Faulty EVAP vent solenoid (stuck closed).
*Plugged, kinked, or pinched vent hose.
*Shorted EVAP vent solenoid driver circuit.
*Plugged evaporative canister.
If any of the above conditions are present, DTC P0446 sets.
The PCM checks for conditions that cause the EVAP system to purge continuously by commanding the EVAP vent solenoid on and the EVAP purge solenoid off (EVAP vent solenoid CLOSED, EVAP purge PWM 0% ). If fuel tank pressure level increases during the test, a continuous purge flow condition is indicated. This can be caused by the following conditions:
*EVAP purge solenoid leaking.
*EVAP purge and engine vacuum source lines switched at the EVAP purge solenoid.
*EVAP purge solenoid driver circuit grounded.
If any of the above conditions are present, DTC P1441 sets.
Refer to the appropriate DTCs for further diagnostic procedures regarding the EVAP system.
Visual Check of Evaporative Emission Canister
*Cracked or damaged, replace the canister.
*Fuel leaking from the canister, replace canister and check lines and line routing.
Here's everything I could find on the EVAP system. Will email diagram also.
__________________
Make this a sticky......Very useful....Thank you
