ECU codes 0801, 0903?
04-09-2004, 09:08 AM
#1
ECU codes 0801, 0903?
I checked my ECU and got these codes.
0801-Vacuum Cut Valve Bypass Valve
Diagnostic Trouble Code 0801 points to a problem with the Vacuum Cut Valve Bypass Valve. The malfunction is detected when an improper voltage signal is sent to the Engine Control Module through the VCVBV. The possible causes of this problem include a defect with the wiring or electrical connector, or with the valve itself. The VCVBV is located under the car, near the rear left tire. It is near the Evaporative Emission Canister but not mounted directly on it.
The VCVBV is a solenoid-controlled air valve. You may remove it from the vehicle and perform a bench test. There are two air hose nipples on the valve. Fasten a length of clean rubber vacuum tubing to either nipple. Gently blow through the hose. The valve should be closed and it should be difficult or impossible to send air through the valve. Now use a pair of fused test leads to provide 12 volts to the electric connector. The polarity doesn't matter. With the VCVBV solenoid energized the valve should be open and it should be easy to send air through the valve.
0903-EVAP Canister vent control valve
Diagnostic Trouble Code 0903 indicates a problem with the Evaporative Emission (EVAP) Canister Vent Control Valve or its associated electric circuit.
This part is used by the Engine Control Module to perform the fuel system leak test. Since it is used only for self-diagnosis your engine will run perfectly well despite the dashboard Malfunction Indicator Lamp.
The EVAP canister and this valve are located under the car, near the rear left tire. You might check to make sure all the electrical connectors in that area are secure.
There's no telling how expensive the repair will be, because no definite diagnosis has been made. Maybe you just have to re-plug a loose connector. Since the EVAP system is part of the emissions control system you might have warranty coverage.
Does anyone know what this is and how I could fix it?
Thanks
Andy
0801-Vacuum Cut Valve Bypass Valve
Diagnostic Trouble Code 0801 points to a problem with the Vacuum Cut Valve Bypass Valve. The malfunction is detected when an improper voltage signal is sent to the Engine Control Module through the VCVBV. The possible causes of this problem include a defect with the wiring or electrical connector, or with the valve itself. The VCVBV is located under the car, near the rear left tire. It is near the Evaporative Emission Canister but not mounted directly on it.
The VCVBV is a solenoid-controlled air valve. You may remove it from the vehicle and perform a bench test. There are two air hose nipples on the valve. Fasten a length of clean rubber vacuum tubing to either nipple. Gently blow through the hose. The valve should be closed and it should be difficult or impossible to send air through the valve. Now use a pair of fused test leads to provide 12 volts to the electric connector. The polarity doesn't matter. With the VCVBV solenoid energized the valve should be open and it should be easy to send air through the valve.
0903-EVAP Canister vent control valve
Diagnostic Trouble Code 0903 indicates a problem with the Evaporative Emission (EVAP) Canister Vent Control Valve or its associated electric circuit.
This part is used by the Engine Control Module to perform the fuel system leak test. Since it is used only for self-diagnosis your engine will run perfectly well despite the dashboard Malfunction Indicator Lamp.
The EVAP canister and this valve are located under the car, near the rear left tire. You might check to make sure all the electrical connectors in that area are secure.
There's no telling how expensive the repair will be, because no definite diagnosis has been made. Maybe you just have to re-plug a loose connector. Since the EVAP system is part of the emissions control system you might have warranty coverage.
Does anyone know what this is and how I could fix it?
Thanks
Andy
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