Code 51 - Switch Signal

WARNING: This page is about a different car, the 1990 Toyota Supra and 1989 Toyota Supra. However, it is still accessible from the selected car via links, so may be relevant.

Probable Causes

A/C Switch or Switch Circuit
A/C Amplifier
Accelerator Pedal or Cable
ECU
Neutral/Start Switch or Switch Circuit
Throttle Position Sensor or Sensor Circuit

NOTE: Diagnostic chart not available from manufacturer.