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The Pressure Sensor Options are for use with the Gen-II units only. The Gen-II units as well as the ECM require functioning pressure sensors to operate correctly.
On 2007 or newer vehicles that have two solenoid type air switching valves with a pressure sensor (one in each air switching valve) this harness with a Factory Toyota pressure sensor is a great cost saving kit addon that will take care of problems caused by a damaged pressure sensors. This replacement sensor will take the place of the damaged pressure sensor built into your 5 pin air switching valve.
In these vehicles, the air injection pressure sensors are much closer to the hot exhaust gases. Damage to these sensors can happen when the vehicle is operated with the air switching valves stuck open which lets the hot exhaust to reach the pressure sensors. It is more common for this sort of damage to cause the pressure sensor to read as a valve stuck open code incorrectly instead of being damaged bad enough to cause a Pressure Sensor Circuit Code. This can cause valve stuck open codes even after installing the bypass kit and block off plates.
A Gen II kit must be installed to use this harness and all the wiring for the pressure sensors/ air switching valves must be intact. If you are getting a pressure sensor circuit code it is important to verify the wiring to the ECM is good first. Sometimes rodents like to chew on wires which the bypass kit nor this Pressure Sensor Option can fix.
Typically to fix the damaged pressure sensor you would have to replace the entire expensive air switching valve assembly.
For all engines two good pressure sensor are needed. These can be the combination of good pressure sensors in the factory air switching valves or PSOs. In the case of two damaged pressure sensors or wanting to remove the air swtiching valves you will need two PSO options added to the Gen-II kit.
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Detailed and illustrated Installation Instructions are easy to follow and include all details for each component of the Bypass Kit.
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The Pressure Sensor Options are for use with the Gen-II units only. One PSO is needed for each damaged valve. Backorders - We are currently having problems sourcing enough factory genuine pressure sensors from Toyota of Japan as part of this product. If you place your order with a factory sensor supplied by us, your order will be automaticly placed on backorder and will ship as soon as we have availablility. As a solution to the short supply of the genuine sensors we can import ourselves, we are now giving the option to buy our PSO harness without the sensor and you can source your own sensor. Due to the amount of counterfeit or non-genuine pressure sensors available we will not provide support for customer supplied sensors.
The PSO are used whith the GenII kit when the vehicle has a damaged secondary air injection system pressure sensor. Most of the vehicles from 2007 and newer have a pressure sensor that is built into the top of each of the secondary air switchign valves. Regardelss of the bypass kits, the vehicle's computer (ECM) still requires these sensors as it uses them as barometric pressure sensors when the SAIS is not operating. When one of these sensors is damaged it most often causes valve stuck open codes that cannot be cleared with the engine not running or pressure sensor circuit fault codes that cannot be cleared. As a work around to replacing the factory air switchign valves because of damaged pressure sensors which on many vehicles requires removing the intake manifold to accomplish, we can replace the pressure sensor with the PSO. Once the GenII kit is installed the PSO will take the place of where the air switching valve would normally plug into the GenII harness and the air switching valve is left completely disconnected and can be elminated if needed.
Most often the pressure sensors in the air switchign valves are damaged by continuing to drive the vehicle for an extended period of time with the valve being physically stuck open or leaking exhaust. It is hard to determine a certain time frame that this damage occurs over becasue of variations in the severity of the exhaust leak and length of time the sensor is exposured to the leaking exhaust. System configurations on the different vehicles also affect the time it takes to damage a pressure sensor but we typically see them get damaged after a couple of weeks of continued exposure.
When there is a pressure sensor circuit code present like P2431-2438 it is important to also check over the wiring from the air swithcing valves to the ECM. Sometimes wiring damage will cause these codes and neither the GenII kit or PSO will work if the problem is in the wiring or connector. It is also important to note that a damaged pressure sensor can also damage the ECM if the circuit codes are present for too long. There is nothing to be done at this point but to also replace the ECM.
For all of the V8 engines (except the 4.6L in the GX460) two good pressure sensor are needed. These can be the combination of good pressure sensors in the factory air switchign valves or PSOs. In the case of two damaged pressure sensors or wanting to remove the air swtiching valves you will need two PSO options added to the Gen-II kit.