Technical Car Experts Answers everything you need: 4x4 vacuum solenoid

Friday, November 30, 2012

Disconnect hoses at EVAP canister purge valve (or VMV).
Connect a hand vacuum pump at the fuel vapor port to EVAP canister at the EVAP canister purge valve (or VMV).
Apply 53 kPa (16 in-Hg) of vacuum to EVAP canister purge valve (or VMV).

See the diagram shown below:----

EVAP Ford

Is it on the driver's side towards the back of the engine bay?

See the diagram shown below:----
IAC valve

There's a 1" diameter hose that goes from the plastic intake cowl (after the maf and before the throttle body) to the base of the iacv. It has a metal canister installed in the line. the canister is about 2" in diameter (5cm) and
2 -1/2" long.

See the diagram shown below:---

Idle air control tube

These details will help.
Thanks.

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The system it is very simple. First both solenoids always have power on the white/light blue wire, and both should have engine vacuum to one of the vacume ports with the engine running. The computer will the engergize the connect solenoid by supplying a ground to energize the appropriate solenoid. And then sending vacumme to the apropriate side of the vacuum pod to engage or disengage the axle. You need to test the power and ground to the solenoids to verify the computer is performing correctly first you should have 12 volts acrossed the terminals of each connector when they are in there appropriate posistion( engage 12 volts in 4hi , disengage 12 in 2hi ) Measure voltage acrossed the terminals this test power and ground to the solenoids. IF ok then using the same principal test vacume out of each solenoid in the appropriate positions. IF ok then test for the same vacuum at the pod with the corresponding lines ( they are color coded compare at solenoid to pod).

This will help.

Thanks.

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