AUTO-REPAIR SOFTWARE:
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Transmission Shift Solenoid Quick-Fix
Automotive transmission may have from 2 to 6 shift solenoids. The solenoid is a copper coil winding. For this test, we'll use a 10 Ohms ceramic resistor and headlight. The 10 Ohm resistor and headlight protects the solenoid. These are the Transmission Shift Solenoid facts.
1) The shift solenoid is powered from 12 volts, igntion power though a fuse. It is grounded by the transmission computer at the other terminal.
2) The shift solenoid resistance range is from 20 to 40 Ohms, but do check the vehicle specs.
3) Use a ceramic 10 Ohms resistor in series with a head light to test the solenoid.
4) Shift solenoids tend to fail after they're hot.
5) To check, apply 12 volt power at one end, and ground the other wire using the resistor headlight tester. Do this for about a minute. If headlight is dim, then solenoids resistance is too high, so replace it.
6) Afterwards, momentarily ground the solenoid on and off, and listen for a clicking noise.
You may also do this procedure, with the engine running in park, to flush out dirt from the solenoid. You may ground the solenoid inside the car, at the transmission connector. This test is also good for duty cycle controlled solenoids. This concludes the Transmission Shift Solenoid Quick-Fix.
