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1994 Celica, Corolla, MR2 & Prizm

  1. Disconnect electrical connector from No. 1 VSS, located on top of transmission. See Figure-Figure . Connect positive battery lead to terminal No. 1 and negative lead to terminal No. 2. Connect positive lead of voltmeter to terminal No. 3 and negative lead to terminal No. 2. See Fig 1.
  2. Rotate speedometer cable shaft on speed sensor. Ensure voltage changes from zero to 11 volts. Voltage should change 4 times per each revolution of speedometer cable shaft. Replace speed sensor if voltage does not change as specified.
Fig 1: Checking No. 1 Vehicle Speed Sensor
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