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Home >> Geo >> 1991 >> Prizm Base, 4D Hatchback, Standard >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - A-240 "E" Series >> Self-Diagnostic System >> System Diagnosis >> Retrieving Fault Codes >> Diagnostic Circuit Check

Diagnostic Circuit Check

  1. Turn ignition on. Release OD switch on shift lever to OFF position. Ensure OD OFF light on instrument panel comes on. See Figure . If OD OFF light does not come on, check OD switch and wiring circuit.
  2. Depress OD switch to the ON position. Ensure OD OFF light on instrument panel goes off. If OD OFF light remains on, check OD switch and wiring circuit. If OD OFF light is blinking, check for stored fault codes. See ATCM FAULT CODES.
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