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The code is for the (throttle motor) magnetic clutch circuit malfunction. It sets if the amperage draw of the magnetic clutch is greater than 1.4 amps or less than 0.8 amps
Here is information on this code.
P1126 Magnetic Clutch Circuit Malfunction
Setting ConditionsETCS magnetic clutch has failedETCS magnetic clutch (+) circuit is open, shorted to ground or to voltageETCS magnetic clutch (-) circuit is open, shorted to ground or to voltagePCM has failed
To run some tests/checks, this is what you are going to need to do..
At the throttle control motor monitor the clutch operation and verify that the computer is supplying the clutch circuit with a 12 volt square wave pulse signal. This will be hard to do using a voltmeter but at least you will know how the circuit works. With the key in the on position, check to see if the throttle motor makes a buzzing noise as the throttle is opened and closed. With the key off you can push the throttle plate open with your finger and allow it to close. The throttle plate should open and close smoothly.
If not, the motor is faulty
I would try and clean the throttle body first before replacing it. Use a soft wire brush or a toothbrush and some throttle body cleaner and gently clean off the debris on the throttle plate (top and bottom and both sides) as well as the throttle bore. Be sure to do a good job. Allow longer cranking time to start the engine after completing the repair as the air fuel ratio will be off and will result in a hard start (this is normal).
Here is a picture of the throttle body assembly
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