Toyota T100 OBDII Code P0450 - Pressure Sensor Malfunction
So, I need to get this fixed on the cheap...I can do the work, but I can't diagnose the problem. Do I need to replace the charcoal canister? Anyone out there run into this code and have it fixed? Any ideas on what the problem could be before I go and by expensive parts.
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Re: Toyota T100 OBDII Code P0450 - Pressure Sensor...
P0450 deals with the Vapor Pressure Sensor, in the fuel tank vapor circuit. Buying a charcoal canister would not cure this.
Go to a Toyota dealer and tell the parts guy that you want a
Vapor Pressure Sensor.
It is on the vapor line, before the charcoal canister.
After you replace the sensor, remove the EFI fuse to clear the code.
I hope that this answers your question.
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Re: Toyota T100 OBDII Code P0450 - Pressure Sensor...
A garage checked my "ON check engine light". They replaced the EGR and EGR solenoid. These parts are side by side on a 2001 Toyota Camry. They said they also cleaned the injectors,intake manifold, and fuel lines. $600 dollars later and two days the light came back on. The auto zone said the light was reading EGR again. When the same garage went to slap a sticker on the car for inspection they said a different code showed of P0401...any thoughts what next to check? Thank you
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Sorry, I never noticed this post, for some reason I did not get an email from Fixya. If it is not too late.......... p0110 is the Intake Air Temp sensor or its wiring connector at fault. This is located at the side of the air cleaner housing. p0135 is a fault in the No 1 oxygen sensor in bank 1, or its wiring connector. This thing is located in the exhaust manifold under the sheet metal shield at the front of the engine p0450 is an evaporative emission system pressure sensor fault. Many people recommend replacing the fuel filler cap gasket before going further with this one
p1410 and p1411 indicate an EGR valve malfunction, and it may be enough to simply clean and check it, located on the engine next to the firewall. Also check the vacuum modulator and Vacuum Switch Valve, as shown here p46, 146, 152, 190
The vapor pressure sensor, VSV for canister closed valve (CCV), VSV for pressure switching valve are used
to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system by the vapor
pressure sensor signal.
DTCs P0441 and P0446 are recorded by the ECM when evaporative emissions leak from the components
when there is a malfunction anywhere in the VSV for EVAP, the VSV
for pressure switching valve, or in the vapor pressure sensor itself.
checked basic , gas cap.
More than likely you need to take to a garage , rec. dealership
will have to perform a smoke check to see if there is a leak somewhere or wether there is a malfunction with a vac. solinoid valve(vsv)
P0450 is Evaporate emission system pressure sensor/switch
the cause could be
1. short or open in the vapor pressure sensor circuit
2.vapour pressure sensor
You can test with the following
you can access the ECM behind the glove box. turn ignition on,backprobe the ECM connector, on A/T models, measure voltage between terminals #1 (green/black wire) and #22 (brown/black wire) at the ECM E6 connector. on M/T models measure the voltage between terminals #1 (green/black wire) and #9 (brown/black wire) at ECM E6. if voltage is 4.5 - 5.5 volts, go to the next step. If the voltage is not 4.5 - 5.5 volts, replace ECM and retest.
2. back-probeECM connector on A/T models measure voltage between terminals #15 (red/blue wire) and #22 (brown/black wire) at ECM E6. on M/T models measure voltage between terminals #4 (red/blue wire) at ECM E5 and connector #9 (brown/black wire) at ECM E6 connector. on all models disconnect the vacuum hose from the vapor pressure sensor. sensor is located near the brake master cylinder. connect a vacuum pump to sensor. if voltage is 2.9-3.7 volts without vacuum applied and 1.3-2.1 volts with .59 in.Hg (2kpa) vacuum applied. replace ECM and retest if voltage is not as specified go to next step.
3. check for open r short circuit in the wiring harness between vapor pressure sensor and ECM. repair wiring as necessary. if wiring harness is okay replace the vapor pressure sensor.
Your vehicle has whats called a OBDII diagnostics setup. Just google "2001 Toyota Tacoma, OBDII trouble codes". You should get a whole page full of responses. (Type in exactly what is in exclamation marks above) Once you have codes, scroll down to PO450. Remember, whatever sensor/circuit it refers to, means there is a problem with the circuit, the sensor, ie..wiring, bad connector, bad ground, short, open, and so on. Dont just change out part without first examining the wiring and connectors first. Common sense goes a long way with this sort of troubleshooting.