2001 Camaro Convertible Evaporator Emissions Control System (EECS)
#1
07-06-2011, 05:22 PM
2001 Camaro Convertible Evaporator Emissions Control System (EECS)
I have a slight dilema. I have two P0440 codes on my girl-friend's 2001 Camaro Convertible. It is a 3800. I replaced the gas cap, and have been trying to locate the Evap cannister. I found the flap on the drivers side wheel well, but I didn't see any cannister. I was wondering if it was on top of the gas tank? I just don't see it! I was going to replace the purge solenoid, but wanted to find out if I was going in the right direction.. Any ideas? Help would be greatly appreciated.
#2
07-07-2011, 04:23 PM
Welcome to the forums. You should repost your question in the 4th Gen > V6 section as more help is available there than in the introductions section. Good luck and welcome!
#3
07-07-2011, 11:30 PM
Can a Moderator move this post to the 4th Gen section for a better response?! 
Here's some useful help in the meantime:
Document ID# 751889
2001 Chevrolet/Geo Camaro
DTC P0440
System Description
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge valve OPEN and the EVAP vent valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or the vacuum level decreases too rapidly, this DTC sets.
The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister purge and vent valves.
Control Module Command
EVAP Canister Purge Valve
EVAP Canister Vent Valve
ON
Open
Closed
OFF
Closed
Open
Conditions for Running the DTC
DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0125, P0443, P0449, P0452, P0453, P1106, P1107, P1112, P1114, P1120, P1220, or P1221 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up ECT and the IAT are within 9°C (16°F).
The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).
Conditions For Setting the DTC
The EVAP system is not able to achieve or maintain vacuum during the diagnostic test.
Action Taken When the DTC Sets
The control module will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test ran and failed.
The control module will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The control module will turn the malfunction indicator lamp (MIL) OFF during the first consecutive trip in which the diagnostic has been run and passed.
A last test failed (current DTC) clears when the control module turns OFF the MIL.
The history DTC will clear after the control module runs and passes 40 consecutive warm up cycles with no failure.
The DTC can be cleared by using a scan tool.
Diagnostic Aids
Use the J 41413 EVAP Pressure/Purge Diagnostic Station in order to pressurize the EVAP system to aid in locating intermittent leaks. Move all EVAP components while testing with the J 41416 Ultrasonic Leak Detector.
A temporary blockage in the EVAP canister purge valve, purge pipe or EVAP canister could cause an intermittent condition. To repair a blockage in the EVAP system refer to Evaporative Emission (EVAP) System Cleaning .
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step is used to verify if a leak is present.
This step verifies proper operation of the fuel tank pressure (FTP) sensor.
This step tests the EVAP canister purge valve for a restriction or blockage.
DTC P0440
Step
Action
Values
Yes
No
Schematic Reference: Evaporative Emissions (EVAP) Hose Routing Diagram
1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls
2
Does the scan tool indicate DTC P0443 or DTC P0449 are also set?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3
3
Inspect the evaporative emission (EVAP) system for the following conditions:
Loose, missing, or damaged service port schrader valve
Loose, incorrect, missing, or damaged fuel fill cap
A damaged EVAP canister purge valve
Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
Inspect the EVAP system for the following conditions:
Disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses
A damaged EVAP canister vent valve or EVAP canister
Did you find and correct the condition?
--
Go to Step 18
Go to Step 4
4
Important
The following steps require the J 41413 EVAP Pressure/Purge Diagnostic Station and the J 41415 Fuel Fill Cap Adaptor .
Always zero the EVAP pressure and vacuum in H2O gages on the EVAP pressure diagnostic station before proceeding with diagnosis.
Install the J 41415 .
Connect the J 41413 and the vehicle fuel fill cap to the J 41415 .
Turn ON the ignition, with the engine OFF.
With the scan tool, seal the EVAP system.
With the J 41413 , pressurize the system to the specified value.
Rotate the EVAP pressure/purge diagnostic station rotary switch to the OFF/HOLD position. Monitor the pressure gage for 1 minute.
Did you obtain and hold the specified value?
5 in H2O
Go to Step 5
Go to Step 7
5
Compare the EVAP pressure/purge diagnostic station value to the scan tool fuel tank pressure (FTP) sensor value.
Does EVAP pressure/purge diagnostic station value measure near the scan tool value?
--
Go to Step 6
Go to Step 11
6
Monitor the pressure gage on the J 41413 .
Disconnect the EVAP purge pipe from the EVAP purge valve.
Does the EVAP system pressure decrease?
--
Go to Step 8
Go to Step 9
7
With the J 41413 , continuously pressurize the EVAP system.
Important
It may be necessary to partially lower the fuel tank to inspect components located in the upper portion of the tank.
With the J 41416 Ultrasonic Leak Detector, inspect for leaks in the following locations:
The EVAP system purge pipe--Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine/Chassis .
The EVAP vapor pipe--Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Canister/Fuel Tank .
The EVAP vent hose/pipe--Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement .
The fuel fill pipe/hose and fuel fill cap--Refer to Filler Tube Replacement .
The EVAP canister--Refer to Evaporative Emission (EVAP) Canister Replacement .
The EVAP canister vent valve--Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement .
The EVAP canister purge valve--Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .
The fuel sender assembly and/or seal--Refer to Fuel Sender Assembly Replacement .
The fuel tank pressure (FTP) sensor seal--Refer to Fuel Tank Pressure Sensor Replacement .
The fill limiter vent valve, pressure relief valve, rollover valve, or fuel tank--Refer to Fuel Tank Replacement .
Did you locate and repair the system?
--
Go to Step 18
Go to Diagnostic Aids
8
Attach a vacuum gage to the purge pipe port of the EVAP purge valve.
Start and idle the engine.
Command the EVAP purge valve to 50 percent with a scan tool.
Does the vacuum gage show vacuum more than the specified value?
10 in H2O
Go to Intermittent Conditions
Go to Step 12
9
Monitor the pressure gage on EVAP pressure/purge diagnostic station.
Disconnect the EVAP purge pipe from the EVAP canister.
Does the EVAP system pressure decrease?
--
Go to Step 14
Go to Step 10
10
Monitor the pressure gage on EVAP pressure/purge diagnostic station.
Disconnect the EVAP vapor line from the EVAP canister.
Does the EVAP system pressure decrease?
--
Go to Step 17
Go to Step 13
11
Monitor the FTP voltage with a scan tool.
Is the FTP voltage more than the specified value?
4.3 V
Go to DTC P0453
Go to Step 15
12
Inspect the vacuum source to the EVAP purge valve for the following conditions:
Blockage
Cuts
Disconnects
Repair as necessary.
Did you find and correct the condition?
--
Go to Step 18
Go to Step 16
13
Repair for a pinched or obstructed EVAP vapor pipe.
Did you complete the repair?
--
Go to Step 18
--
14
Repair the restriction in the EVAP purge pipe. Refer to Evaporative Emission (EVAP) System Cleaning .
Did you complete the repair?
--
Go to Step 18
--
15
Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?
--
Go to Step 18
--
16
Replace the EVAP purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .
Did you complete the repair?
--
Go to Step 18
--
17
Replace the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
Did you complete the repair?
--
Go to Step 18
--
18
Turn ON the ignition, with the engine OFF.
Command the EVAP vent valve ON with a scan tool.
Important
Do not exceed the specified value in the step. Exceeding the specified value may produce incorrect test results.
Pressurize the EVAP system to the specified value with the J 41413 .
Place the control **** on the J 41413 to the OFF/HOLD position.
Monitor the EVAP system pressure on the J 41413 for 5 minutes.
Does the scan tool indicate that the Service Bay Test passed?
5 in H2O
Go to Step 19
Go to Step 7
19
Monitor the pressure gage on the J 41413 .
Command the EVAP purge valve to 50 percent.
Does the EVAP system pressure decrease?
--
Go to Step 20
Go to Step 9
20
With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
--
Go to Diagnostic Trouble Code (DTC) List
System OK
Document ID# 751889
2001 Chevrolet/Geo Camaro
Here's some useful help in the meantime:
Document ID# 751889
2001 Chevrolet/Geo Camaro
DTC P0440
System Description
The control module tests the evaporative emission (EVAP) system for a large leak. The control module monitors the fuel tank pressure (FTP) sensor signal to determine the EVAP system vacuum level. When the conditions for running are met, the control module commands the EVAP canister purge valve OPEN and the EVAP vent valve CLOSED . This allows engine vacuum to enter the EVAP system. At a calibrated time, or vacuum level, the control module commands the EVAP canister purge valve closed, sealing the system, and monitors the FTP sensor input in order to determine the EVAP system vacuum level. If the system is unable to achieve the calibrated vacuum level, or the vacuum level decreases too rapidly, this DTC sets.
The following table illustrates the relationship between the ON and OFF states, and the OPEN or CLOSED states of the EVAP canister purge and vent valves.
Control Module Command
EVAP Canister Purge Valve
EVAP Canister Vent Valve
ON
Open
Closed
OFF
Closed
Open
Conditions for Running the DTC
DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0125, P0443, P0449, P0452, P0453, P1106, P1107, P1112, P1114, P1120, P1220, or P1221 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The intake air temperature (IAT) is between 4-30°C (39-86°F).
The start-up ECT and the IAT are within 9°C (16°F).
The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).
Conditions For Setting the DTC
The EVAP system is not able to achieve or maintain vacuum during the diagnostic test.
Action Taken When the DTC Sets
The control module will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test ran and failed.
The control module will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The control module will turn the malfunction indicator lamp (MIL) OFF during the first consecutive trip in which the diagnostic has been run and passed.
A last test failed (current DTC) clears when the control module turns OFF the MIL.
The history DTC will clear after the control module runs and passes 40 consecutive warm up cycles with no failure.
The DTC can be cleared by using a scan tool.
Diagnostic Aids
Use the J 41413 EVAP Pressure/Purge Diagnostic Station in order to pressurize the EVAP system to aid in locating intermittent leaks. Move all EVAP components while testing with the J 41416 Ultrasonic Leak Detector.
A temporary blockage in the EVAP canister purge valve, purge pipe or EVAP canister could cause an intermittent condition. To repair a blockage in the EVAP system refer to Evaporative Emission (EVAP) System Cleaning .
Reviewing the Failure Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
This step is used to verify if a leak is present.
This step verifies proper operation of the fuel tank pressure (FTP) sensor.
This step tests the EVAP canister purge valve for a restriction or blockage.
DTC P0440
Step
Action
Values
Yes
No
Schematic Reference: Evaporative Emissions (EVAP) Hose Routing Diagram
1
Did you perform the Diagnostic System Check-Engine Controls?
--
Go to Step 2
Go to Diagnostic System Check - Engine Controls
2
Does the scan tool indicate DTC P0443 or DTC P0449 are also set?
--
Go to Diagnostic Trouble Code (DTC) List
Go to Step 3
3
Inspect the evaporative emission (EVAP) system for the following conditions:
Loose, missing, or damaged service port schrader valve
Loose, incorrect, missing, or damaged fuel fill cap
A damaged EVAP canister purge valve
Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information.
Inspect the EVAP system for the following conditions:
Disconnected, improperly routed, kinked, or damaged EVAP pipes and hoses
A damaged EVAP canister vent valve or EVAP canister
Did you find and correct the condition?
--
Go to Step 18
Go to Step 4
4
Important
The following steps require the J 41413 EVAP Pressure/Purge Diagnostic Station and the J 41415 Fuel Fill Cap Adaptor .
Always zero the EVAP pressure and vacuum in H2O gages on the EVAP pressure diagnostic station before proceeding with diagnosis.
Install the J 41415 .
Connect the J 41413 and the vehicle fuel fill cap to the J 41415 .
Turn ON the ignition, with the engine OFF.
With the scan tool, seal the EVAP system.
With the J 41413 , pressurize the system to the specified value.
Rotate the EVAP pressure/purge diagnostic station rotary switch to the OFF/HOLD position. Monitor the pressure gage for 1 minute.
Did you obtain and hold the specified value?
5 in H2O
Go to Step 5
Go to Step 7
5
Compare the EVAP pressure/purge diagnostic station value to the scan tool fuel tank pressure (FTP) sensor value.
Does EVAP pressure/purge diagnostic station value measure near the scan tool value?
--
Go to Step 6
Go to Step 11
6
Monitor the pressure gage on the J 41413 .
Disconnect the EVAP purge pipe from the EVAP purge valve.
Does the EVAP system pressure decrease?
--
Go to Step 8
Go to Step 9
7
With the J 41413 , continuously pressurize the EVAP system.
Important
It may be necessary to partially lower the fuel tank to inspect components located in the upper portion of the tank.
With the J 41416 Ultrasonic Leak Detector, inspect for leaks in the following locations:
The EVAP system purge pipe--Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Engine/Chassis .
The EVAP vapor pipe--Refer to Evaporative Emission (EVAP) Hoses/Pipes Replacement - Canister/Fuel Tank .
The EVAP vent hose/pipe--Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement .
The fuel fill pipe/hose and fuel fill cap--Refer to Filler Tube Replacement .
The EVAP canister--Refer to Evaporative Emission (EVAP) Canister Replacement .
The EVAP canister vent valve--Refer to Evaporative Emission (EVAP) Canister Vent Valve Replacement .
The EVAP canister purge valve--Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .
The fuel sender assembly and/or seal--Refer to Fuel Sender Assembly Replacement .
The fuel tank pressure (FTP) sensor seal--Refer to Fuel Tank Pressure Sensor Replacement .
The fill limiter vent valve, pressure relief valve, rollover valve, or fuel tank--Refer to Fuel Tank Replacement .
Did you locate and repair the system?
--
Go to Step 18
Go to Diagnostic Aids
8
Attach a vacuum gage to the purge pipe port of the EVAP purge valve.
Start and idle the engine.
Command the EVAP purge valve to 50 percent with a scan tool.
Does the vacuum gage show vacuum more than the specified value?
10 in H2O
Go to Intermittent Conditions
Go to Step 12
9
Monitor the pressure gage on EVAP pressure/purge diagnostic station.
Disconnect the EVAP purge pipe from the EVAP canister.
Does the EVAP system pressure decrease?
--
Go to Step 14
Go to Step 10
10
Monitor the pressure gage on EVAP pressure/purge diagnostic station.
Disconnect the EVAP vapor line from the EVAP canister.
Does the EVAP system pressure decrease?
--
Go to Step 17
Go to Step 13
11
Monitor the FTP voltage with a scan tool.
Is the FTP voltage more than the specified value?
4.3 V
Go to DTC P0453
Go to Step 15
12
Inspect the vacuum source to the EVAP purge valve for the following conditions:
Blockage
Cuts
Disconnects
Repair as necessary.
Did you find and correct the condition?
--
Go to Step 18
Go to Step 16
13
Repair for a pinched or obstructed EVAP vapor pipe.
Did you complete the repair?
--
Go to Step 18
--
14
Repair the restriction in the EVAP purge pipe. Refer to Evaporative Emission (EVAP) System Cleaning .
Did you complete the repair?
--
Go to Step 18
--
15
Replace the FTP sensor. Refer to Fuel Tank Pressure Sensor Replacement .
Did you complete the replacement?
--
Go to Step 18
--
16
Replace the EVAP purge valve. Refer to Evaporative Emission (EVAP) Canister Purge Valve Replacement .
Did you complete the repair?
--
Go to Step 18
--
17
Replace the EVAP canister. Refer to Evaporative Emission (EVAP) Canister Replacement .
Did you complete the repair?
--
Go to Step 18
--
18
Turn ON the ignition, with the engine OFF.
Command the EVAP vent valve ON with a scan tool.
Important
Do not exceed the specified value in the step. Exceeding the specified value may produce incorrect test results.
Pressurize the EVAP system to the specified value with the J 41413 .
Place the control **** on the J 41413 to the OFF/HOLD position.
Monitor the EVAP system pressure on the J 41413 for 5 minutes.
Does the scan tool indicate that the Service Bay Test passed?
5 in H2O
Go to Step 19
Go to Step 7
19
Monitor the pressure gage on the J 41413 .
Command the EVAP purge valve to 50 percent.
Does the EVAP system pressure decrease?
--
Go to Step 20
Go to Step 9
20
With a scan tool, observe the stored information, Capture Info.
Does the scan tool display any DTCs that you have not diagnosed?
--
Go to Diagnostic Trouble Code (DTC) List
System OK
Document ID# 751889
2001 Chevrolet/Geo Camaro
#4
07-09-2011, 09:31 AM
Thanks guys! Libertyforall1776, I understand the system much better now. Still not sure if I want to move the gas tank to check evap cannister or evap vent valve. Is it possible I tried to put too much gas in tank and backflowed cannister? If so, is there a remedy for this? I may try lowering gas tank to check cannister and vent valve if it's not to involved. Also might try cleaning or replacing purge valve in case of blockages or malfunction. Don't really know how to pressurize system or check for vacuum leaks.. Hoses look okay but again, not sure what's happening on top of gas tank. Can unhook solenoid purge valve and start engine and see if there is a vacuum there, if that's okay. Appreciate the help, and any ideas or suggestions are welcome! P.S. What are the dangers, if any, if someone starts the vehicle with the diagnostic tool connected?
Thread
Thread Starter
Forum
Replies
Last Post
mccue
93-02 General
6
01-25-2012 06:29 PM
cujeg1
93-02 V6 Tech
2
07-10-2011 05:05 AM
