Question about 2001 Chevrolet Cavalier

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Enginelight on and had diagnose and 1 code came up and said somthing about evaporation system but does it have an egr or the canister type

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Evap codes are common and can be caused by something as simple as a loose gas cap. Usually it is a "small leak detected" and is virtually impossible to discover without doing a smoke test. Few shops have the capability and the test is usually fairly expensive if they do. On older vehicles the cause is sometimes a rusted filler pipe,,, in areas where rust is a problem. Of course it could also be a defective evap solonoid among many other things. Unfortunately, if the check engine light being on bothers you you'll have to take the car to a professional to be diagnosed and repaired or spend a lot of time and money replacing parts hit or miss yourself. This is not a problem that will adversly effect the operation of the vehicle.

Posted on Oct 03, 2009

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1 Answer

1997 Nissan alti ma threw code p1400. Cleaned she valve & checked she control solenoid harness. Replaced the egr control solenoid and it is still stalling at takeoff. Help please?


code p 1400 refers to exhaust gas recirculation (EGR) system or evaporative emission (EVAP)canister purge system===causes--wiring---EGR or EVAP valve or ECM
the valve in the EGR may be faulty and bot the solenoid or the problem could be in the EVAP side

May 04, 2016 | Nissan Cars & Trucks

1 Answer

What do dtc's po172,po300,po455 mean together


code p 0172 refers to system too rich bank 1=== causes --intake blocked --EVAP canister purge valve ---fuel pressure --EGR system---injector/s---HO2S ( heated oxygen sensor )
code p 0300 refers to ransom/ multiple cylinder/s ---misfires detected===causes --spark plug/s---HT lead/s---injector/s---coil/s - low compression
code p 0455 refers to evaporative (EVAP) emission system--large leak detected ===causes ---hose connections --intake leak--- EVAP canister---EVAP canister purge valve
AS a side idea , check that the fuel cap is properly installed first as it may not be properly tightened or fitted

Feb 24, 2016 | Cars & Trucks

3 Answers

2002 Ford f150 evaporative emission control system sensor where is it located


on top of the canister purge can , next to the solenoid of same purpose

Jan 30, 2016 | Ford Cars & Trucks

2 Answers

1996 Volvo GLT 2.0 valve, got two codes need to know what to do to fix them P0440, P0172.


http://www.datsc.com/tabid/122/OBD-Error-Code/P0440/Diagnostics/volvo/Default.aspx

And

http://volvospeed.com/vs_forum/topic/9451-ecu-fault-code-p0172/


Dec 25, 2015 | Volvo Cars & Trucks

1 Answer

My 06 cobalt has these codes can anyone tell me what they mean? Are they an expensive fix? p0446,p0455, p0172


code p0446 refers to evaporative emission (EVAP) system-vent control-circuit malfunction===causes --wiring--EVAP canister purge valve--ECM
code p0455 refers to EVAP system-large leak detected===causes --hose connections--intake leak--EVAP canister---EVap canister purge valve
code p0172 refers to system too rich, bank 1===causes intake blocked---EVAP canister purge valve--fuel pressure ---EGR system---injector/s ---ECM
because the EVAP purge valve appears in all codes I would be inclined to change that unit first the run the fault codes again

Jul 23, 2015 | 2006 Chevrolet Chevrolet Cobalt LT

1 Answer

Enginelight stays on no problems


It's not there to tell you it's running bad , that should be fairly obvious . It's there as part of OBD 2 to tell you your vehicle is polluting 1.5 times more then allowed by the EPA . You probably have a evaporative emission system problem ! The EVAP system as it is called traps an contains fuel vapors in a charcoal canister an then when the engine computer by it's programming will suck the vapors into the engine . If there is a leak in the system the computer knows an sets codes . EVAP Evaporative Emission Control System

May 18, 2015 | 2008 GMC Yukon SLT-2

1 Answer

HOW TO FIX THIS CODE p0446 code


The EGR (Evaporative Gas Recirculation) system has several components. The most likely one to cause an error is the EGR Position Sensor, located at the throttle body. If the EGR Sensor has become disconnected, has failed, or is sensing that the EGR valve has become stuck, it will generate an error. Check the EGR valve to be sure it isn't stuck, and check the EGR Position Sensor to be sure it is operating properly.

Also, in some cases, if the Canister Purge Valve has failed, it will generate an error. The Canister Purge Valve is usually located at one of the front fenders near the Carbon Canister.

Jul 19, 2014 | 1998 Toyota 4Runner

1 Answer

What does obd 1 code 25 and 26 mean?


EOBD II Error Code: 25
Description:
System too Lean, Bank 1
Possible Causes:
- Intake/exhaust leak.
- Secondary air injection (AIR) system.
- Manifold absolute pressure (MAP) sensor.
- Mass air flow (MAF) sensor.
- Fuel pressure/pump.
- Injector(s).
- Evaporation emission (EVAP) canister purge valve.
- Heated oxygen sensor (HO2S).
- Contaminated fuel.

EOBD II Error Code: 26
Fault Location:
System too Rich, Bank 1
Description:
- Evaporation emission (EVAP) canister purge valve .
- Fuel pressure.
- Injector(s).
- Heated oxygen sensor (HO2S).
- Contaminated fuel.
Hope that works.

May 24, 2014 | 1995 Toyota 4Runner

1 Answer

Hook up to carmd shows number po440 whats the diagnostic problem


po440 is evaporative emission control system malfunction. check your egr valve,egr valve solenoid, evaporative canister ,and evaporative canister solenoid

Jun 09, 2011 | 2000 Pontiac Grand Am GT

1 Answer

1995 mercury villager check engine code p1200 injector open


P0400 = EGR Flow
P0325 = knock sensor (Do not ever change a knock sensor, they don't affect anything and cost $600 to replace for absolutely no gain)
P1200 = I can't find this one. I think it's injector flow
report back on what you find.
Egr flow may be plugged egr passages or a bad solenoid.
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1996 PCED OBDII-Villager SECTION 1B: Description and Operation
Exhaust Gas Recirculation System
Exhaust Gas Recirculation (EGR) System Operation The exhaust gas recirculation (EGR) system (Figure 1 below) recirculates a portion of the exhaust gases into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies according to operating conditions and will be cut completely under:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
The exhaust gas recirculation (EGR) system on the Villager uses the exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid valve to provide vacuum to both the EGR valve and the EVAP canister when commanded by the PCM. If the exhaust backpressure is sufficient to close the EGR backpressure transducer valve, vacuum is sent to the EGR valve and allows EGR gas to flow into the intake manifold. If the exhaust backpressure is not sufficient, the EGR backpressure transducer will remain open and allow vacuum from the EGR/EVAP control solenoid to vent to the atmosphere.
The EGR system monitor, for OBD II regulations, uses an EGR temperature sensor to monitor the EGR system. The EGR temperature sensor is a thermister located in the EGR passageway. When hot exhaust gas is recirculated into the engine, the temperature at the EGR passageway increases. This increase is sensed by the EGR temperature sensor and a signal is sent to the PCM to indicate EGR flow. If the EGR temperature sensor does not detect EGR flow when commanded by the PCM after two consecutive drive cycles, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored. The MIL will be turned off after three consecutive drive cycles are completed with no malfunctions detected. The DTC will remain stored in the PCM memory until 80 drive cycles have been completed without the same malfunction detected in the system.
Figure 1: Exhaust Gas Recirculation (EGR) System Diagram Item Number Description 1 — EGR/EVAP Control Solenoid 2 — Air Cleaner Housing 3 — Throttle Valve 4 — EGR Temperature Sensor 5 — EGR Valve 6 — EGR Backpressure Transducer 7 — EVAP Canister
Exhaust Gas Recirculation (EGR) Backpressure Transducer Valve The exhaust gas recirculation (EGR) backpressure transducer valve is used to control EGR. The EGR valve is operated by ported vacuum, but the ported vacuum will normally be vented off at the EGR backpressure transducer valve. As rpm increases, exhaust pressure increases and pushes on the diaphragm in the EGR backpressure transducer valve and closes the vacuum vent.
Figure 2: EGR Backpressure Transducer Value
Item Number Description 1 — Throttle Valve 2 — Vacuum Port 3 9D475 EGR Valve 4 9F452 EGR Backpressure Transducer Valve 5 — EVAP Canister 6 — EGR/EVAP Control Solenoid 7 — Vent
EGR/EVAP Control Solenoid The exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid (Figure 3) is controlled by the powertrain control module (PCM). The EGR/EVAP control solenoid controls vacuum to both the exhaust gas recirculation (EGR) valve and to the evaporative (EVAP) emission canister. When the EGR/EVAP control solenoid is off (12 V signal from the PCM) vacuum is supplied to both the EGR valve and to the EVAP canister. When the EGR/EVAP control solenoid is on (ground supplied by PCM) vacuum is vented to the atmosphere keeping the EGR valve closed and no vacuum to the EVAP canister. The PCM will command the EGR/EVAP control solenoid on at:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
Figure 3: Exhaust Gas Recirculation/Evaporative Emission (EGR/EVAP) Control Solenoid
Exhaust Gas Recirculation (EGR) Temperature Sensor
The exhaust gas recirculation (EGR) temperature sensor (Figure 4) is a thermister type sensor that monitors the temperature of the exhaust in the EGR passageway. As the EGR flow increases, the temperature increases. This process creates a change in the resistance of the sensor, which decreases as the temperature increases. The signal is sent to the powertrain control module (PCM) to indicate that the EGR system is working properly. If the EGR temperature sensor does not change resistance as the PCM expects on two consecutive drives, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored.
Figure 4: EGR Temperature Sensor Exhaust Gas Recirculation (EGR) Valve
The exhaust gas recirculation (EGR) valve (Figure 5) recirculates portions of the exhaust gas back into the intake manifold to reduce the amount of the NOx released during combustion and to reduce combustion temperature. The amount of exhaust gases that are released into the engine is proportional to the load on the engine.
Figure 5: EGR Valve

Mar 20, 2009 | 1995 Mercury Villager

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