Can someone tell me what part this is?
01-11-05, 04:01 AM
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Can someone tell me what part this is?
Don't know the name of this particular part. It has something to do with OBD (On Board Diagnostics). If someone knows the part name or part number of it, let me know. Thanks.
(its the part connected to the red hoses)
(its the part connected to the red hoses)
01-13-05, 09:10 PM
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Originally Posted by digger08
Not positive on the name...but I believe it is called a VSV. It is part of the Canister Purge Solenoid and related to the EVAP system.
Sorry if I am way off here...just a best guess.
Digger08
Sorry if I am way off here...just a best guess.
Digger08
01-15-05, 07:41 AM
#4
Called "Cannister purge solenoid valve"
It seems there is 2 systems:
VSV - for "Cannister closed valve" (CCV)
VSV - for "Evap"
I think from the schematic - it looks like this is the VSV for the Canister Closed Valve (CCV)
I can not see a part number for this specific item, but the entire cannister assembly is around the $350.00 range
Everything you ever wanted to know about purge systems!
It seems there is a desription for 3 different types:
EVAP System Outline
• Early Type Description
• Late Type Description
• Late Type System Monitor Sequence
These may have change based on the year of vehicle you have.
Description of operation:
Late Type (Intrusive) EVAP System Monitor Sequence
The monitoring sequence for leak detection is different from that of the Early Type EVAP System. The Late Type applies a very small vacuum to the EVAP system. The ECM then determines if there is a problem in the system based on the vapor pressure sensor signal.
Monitor Sequence
Monitor Operation
The monitor sequence begins with a cold engine start. The IAT and ECT sensors must have approximately the same temperature reading.
The ECM is constantly monitoring fuel tank pressure. As the temperature of the fuel increases, pressure slowly rises.
The ECM will purge the charcoal canister at the appropriate time (see Figure 1). With bypass VSV closed, pressure will continue to rise in fuel tank.
Purge VSV Operation - P0441
At a predetermined point, the ECM closes the CCV and opens the Bypass VSV causing vacuum to increase in the entire EVAP system.
The ECM continues to operate the purge VSV until the vacuum is increased to a specified point at which time the ECM closes the purge VSV (see Figure 2).
If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the purge VSV and related components to be faulty.
Hole Detection P0440 and P0442
The rate of pressure increase as detected by the vapor pressure signal indicates the if there is a leak and if it is a large or small leak.
After purge valve operation, the purge VSV is turned off sealing the vacuum in the system and the ECM begins to monitor the pressure increase (see Figure 3). Some increase is normal. A very rapid, sharp increase in pressure indicates a leak in the EVAP system and sets the DTC P0440.
This monitoring method is also able to distinguish what is called the small leak detection. A pressure rise just above normal indicates a very small hole and will set the DTC P0442.
Vent Control, CCV Operation P0446
This stage checks the CCV and vent (air inlet side) operation. When the vapor pressure rises to a specified point, the ECM opens the CCV. Pressure will increase rapidly because of the air allowed into the system. No increase or an increase below specified rate of pressure increase indicates a restriction on the air inlet side.
Bypass VSV Operation P0446
In the next stage, the ECM closes the bypass VSV. This action blocks air entering the fuel tank side of the system. The pressure rise on the fuel tank side is no longer as great. If there was no change in pressure, the ECM will conclude the bypass VSV did not close.
This should be enough info. for a dealer to source you the correct part
It seems there is 2 systems:
VSV - for "Cannister closed valve" (CCV)
VSV - for "Evap"
I think from the schematic - it looks like this is the VSV for the Canister Closed Valve (CCV)
I can not see a part number for this specific item, but the entire cannister assembly is around the $350.00 range
Everything you ever wanted to know about purge systems!
It seems there is a desription for 3 different types:
EVAP System Outline
• Early Type Description
• Late Type Description
• Late Type System Monitor Sequence
These may have change based on the year of vehicle you have.
Description of operation:
Late Type (Intrusive) EVAP System Monitor Sequence
The monitoring sequence for leak detection is different from that of the Early Type EVAP System. The Late Type applies a very small vacuum to the EVAP system. The ECM then determines if there is a problem in the system based on the vapor pressure sensor signal.
Monitor Sequence
Monitor Operation
The monitor sequence begins with a cold engine start. The IAT and ECT sensors must have approximately the same temperature reading.
The ECM is constantly monitoring fuel tank pressure. As the temperature of the fuel increases, pressure slowly rises.
The ECM will purge the charcoal canister at the appropriate time (see Figure 1). With bypass VSV closed, pressure will continue to rise in fuel tank.
Purge VSV Operation - P0441
At a predetermined point, the ECM closes the CCV and opens the Bypass VSV causing vacuum to increase in the entire EVAP system.
The ECM continues to operate the purge VSV until the vacuum is increased to a specified point at which time the ECM closes the purge VSV (see Figure 2).
If the vacuum did not increase, or if the vacuum increased beyond the specified limit, the ECM judges the purge VSV and related components to be faulty.
Hole Detection P0440 and P0442
The rate of pressure increase as detected by the vapor pressure signal indicates the if there is a leak and if it is a large or small leak.
After purge valve operation, the purge VSV is turned off sealing the vacuum in the system and the ECM begins to monitor the pressure increase (see Figure 3). Some increase is normal. A very rapid, sharp increase in pressure indicates a leak in the EVAP system and sets the DTC P0440.
This monitoring method is also able to distinguish what is called the small leak detection. A pressure rise just above normal indicates a very small hole and will set the DTC P0442.
Vent Control, CCV Operation P0446
This stage checks the CCV and vent (air inlet side) operation. When the vapor pressure rises to a specified point, the ECM opens the CCV. Pressure will increase rapidly because of the air allowed into the system. No increase or an increase below specified rate of pressure increase indicates a restriction on the air inlet side.
Bypass VSV Operation P0446
In the next stage, the ECM closes the bypass VSV. This action blocks air entering the fuel tank side of the system. The pressure rise on the fuel tank side is no longer as great. If there was no change in pressure, the ECM will conclude the bypass VSV did not close.
This should be enough info. for a dealer to source you the correct part
Last edited by digger08; 01-15-05 at 07:57 AM.
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