The 2JZGE VSV or Vacuum Switching Valve can often be misunderstood when it comes to the 2JZ engine. Many enthusiasts feel as though the acronym stands for the twin turbocharger setup that’s found on the USDM or JDM 2JZGTE 3.0 liter Toyota engine. In reality however, this valve is used on many different Toyota applications for a variety of reasons from EGR to Idle Air Control.
Today we’ll be looking at the vacuum switching valve (VSV) on a 1995 Lexus SC300 with a 2JZGE engine in it. This engine is similar to the turbocharged brother the 2JZGTE, and shares many components with it’s more powerful relative.
The part number we’re addressing today is 90910-12125 and is described by Toyota as a simple vacuum switching device but we’ll be showing you How to Service 2JZGE VSV for a variety of purposes.
Let’s begin with the Acoustic Control Induction System, or the ACIS which the VSV is used to vary the length the intake charge must travel. This is designed and incorporated in such a manner to improve and optimize power and torque. There is a OBDII trouble code that’s associated with this component and it’s P1666 for VSV for ACIS Circuit Malfunction.
How To Test your VSV for ACIS
First you’ve got to locate the VSV that your 2JZ ACIS uses, this unit is mounted to the backside of the carryover intake manifold. If your 2JZ has a front facing intake manifold, it’s been modified and you’ve got to do some digging. For stock 2JZGE engines, the VSV valve for the ACIS is found here.
There are 2 bolts that hold the VSV and bracket to the back of your intake manifold. You can unbolt these and merely pull away to bend the VSV out of place. Unplug the engine harness and you can remove the entire VSV unit itself with the bracket in place. Disconnect the one vacuum hose that leads back to the intake manifold first.
Test 1 – Continuity in your 2JZGE VSV
Now that you have the VSV unit removed, take your multimeter to test for continuity between the two terminals.
You will be measuring for continuity between the two pins on the VSV valve. You will be looking for a resistance value between 38.5 – 44.5 Ω with this VSV valve cold.
Test 2 – Checking for Ground in your VSV
Next take the positive lead of your multimeter and ground it someplace on the vehicle chassis. Now take the negative lead and put it to each of the two VSV pins in question. You should not have any continiuty here between the ground and either one of the pins. If you find that there’s a break or short in your valve, there will be continuity at least one of the pins and the VSV should be replaced.
Test 3 – Checking for blow-through
With the VSV valve removed, gently blow into the port labeled F shown in the diagram below.
Once applying gentle air pressure to this nipple, you should feel the air escaping through the VSV bypass, which is port F in the diagram above.
Test 4 – Powering the 2JZGE VSV valve outside of the car
If you have a voltage device that is capable of sending power or ground to specific terminals this part of the test is easy. For those without such a tool, you’ve got to get creative and either create two wires with slide on spades or hack up an existing VSV connector.
You will be sending power and ground to each one of the respective terminals on the VSV unit, and testing for operation. With the VSV valve powered, you should see activity and air being passed from one nipple to another. If not, your valve is bad and must be replaced to correct your problem.
Other related VSV tests
We mentioned earlier in our How to Service 2JZGE VSV Guide that the VSV valve is used for many different uses on the 2JZGE engine. Because most of these tests are exactly the same because the VSV valves do not change in operation, we won’t bother relisting each test for each valve in your 2JZGE. Instead we will provide the resistance values you will be checking for depending on what the VSV is supposed to do for your vehicle.
VSV – EVAP SYSTEM – 27 – 32 Ω of resistance
VSV – EGR SYSTEM – 38.5 – 45.5 Ω of resistance
You’ve now completed our How to Service 2JZGE VSV Guide, if you have any questions or comments, please leave them for us below!
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[…] If your 2JZ IAC does not respond, check the vacuum line that runs under the intake manifold to the IAC VSV unit. If you need a How To Service your 2JZ VSV Guide, please click here. […]