P0450 - No power to Vapor Pressure Sensor - Camry Forums - Toyota Camry Forum


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Old 07-15-2017, 02:35 PM
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Post P0450 - No power to Vapor Pressure Sensor

I am constantly fighting an uphill battle with check engine codes on my 2001 Camry LX, 4 cylinder, auto. The latest is a P0450. My Haynes manual pointed to a bad Vapor Pressure Sensor, which is located on the charcoal canister behind the gas tank.

According to the manual, if I disconnect the connector and touch probes to the 2 terminals, which the key turned to the ON position, I should be reading 4.5 to 5.5 volts. I am reading nothing. No power to the VPS at all. I tested the wires an inch up from the connector and still nothing. The wires are purple and yellow.

The wiring goes up above the canister, into the area behind the back seats, then into the covered door frame. Where they come out in the engine bay I have no idea.

Does anyone have advice on this code or what to try to diagnose this lack of power? Someone on the forum once told me that there is not always power going back to the VSP, even with the key ON, but the Haynes manual says there should be power. The manual has wiring diagrams in the back, but I don't understand them very well. Any help would be greatly appreciated.
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Old 07-15-2017, 09:20 PM
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How many plug wires and what colors?
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Old 07-16-2017, 03:06 PM
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There are 2 wires going into the VSP. One is purple, the other is yellow.
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Old 07-17-2017, 11:24 AM
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