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Home >> Geo >> 1990 >> Prizm Base, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Circuit Check >> Code 41, Throttle Switch Circuit (VIN 6) >> Notes
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Code 41, Throttle Switch Circuit (VIN 6): Notes

On vehicles equipped with manual transaxle, the ECM supplies 4-5 volts to a throttle switch on the throttle body. When engine is idling, the ECM senses a low signal voltage, with slight throttle, ECM will sense a high signal voltage. At wide open throttle, signal voltage is low. Code 41 sets if ECM sees a low or high voltage signal all the time.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. The ECM supplies battery voltage to the throttle switch. Poor connection or a ground circuit will indicate a low signal.
  2. This checks for a misadjusted throttle switch.