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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

‘96 Ford Aerostar, Check Engine Light On

Q: I have a ‘96 Ford Aerostar with v6, 3.0L. The check engine light is on and the code is P1443 which is related to the evaporator pressure sensor. I replaced the sensor, checked the valve and it is Ok, replaced the canister and a few hoses. The check light still comes ON even after it was cleared. Any suggestion on how to fix this problem?

A: In your situation I would suggest not using the OBD II type codes if they were obtained via generic OBD II data acquisition. First you have to understand a little bit of how the computer tests these parts . The code you’re reporting can be set by a functional failure or by a circuit failure. Either the component being tested did not work as designed or the electrical part (wire or the wire in the component) has a problem. When you start and drive your vehicle the computer performs a function test of the canister purge solenoid. During the function test the computer uses the voltage signal from another sensor to see a change. When the computer commands open and closed some other sensor reports that yeah I saw a change. That’s the function. Then while you’re driving, the computer keeps an eye on the circuit (the wires to and from). This is called the circuit test and this test happens all the time. Here’s where those high end or factory computer scan tools really shine. The scan tool can command the computer to perform a function test right in the shop with key on and the engine off. This allows the technician to check the operation of the parts without the hazard of hanging off the side of the vehicle with test equipment at 40 MPH. (Which is a good thing.) You’re at the point where what is needed is information, real diagnostic equipment and a well trained technician. Anyone can be shown how to get a code from a vehicle’s computer. To get it fixed right? You know the answer.

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