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Speedometer Consistently Too High Or Too Low

  1. Read all 3 steps of this test procedure before performing any step. Check odometer reading against mileage markers (or other known distance) for 10 miles. If odometer reads okay, system okay. If not okay, proceed to step 2).
  2. Remove speedometer sensor from transmission. Verify that correct drive gear is installed for vehicle transmission/axle/tire combination. If correct, proceed to step 3). If not correct, install correct gear and retainer clip.
  3. Check drive gear on output shaft for correct applicability. If correct gear is installed, replace EIM. If incorrect gear is installed, install correct shaft and gear.
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