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Codes 71-78 (Speed Sensor Signal Check)

  1. Turn ignition off. Connect jumper wire between terminals Ts and E1 of Data Link Connector (DLC) No. 1. See Figure. DO NOT remove short pin from DLC No. 1. Start engine. Light should flash quickly (8 times per second).
  2. Drive vehicle straight ahead at a speed greater than 28 MPH for several seconds. Stop vehicle, but leave engine running. Connect jumper wire between terminals Tc and E1 of DLC No. 1.
    • Light Flashes Quickly (4 Times Per Second) - This is called "normal" code - system is normal (no codes are stored).
    • Codes Are Flashed

If codes are stored, the light will flash a 2-digit code (example of Code 73: seven FLASHES, pause, three FLASHES). If more than one code is stored, there will be a 2.5-second pause between each code. After all codes are flashed, a 4-second pause will occur, then all codes will repeat. For code interpretation, see INTERPRETING CODES. After servicing, clear codes. See CLEARING CODES.

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