Toyota Supra JZA80

Connector connection and terminal inspection

Open circuit:

This could be due to a disconnected wire harness, faulty contact in the connector, a connector terminal pulled out, etc.

  1. It is rarely the case that a wire is broken in the middle of it. Most cases occur at the connector. In particular, carefully check the connectors of sensors and actuators.
  2. Faulty contact could be due to rusting of the connector terminals, to foreign materials entering terminals or a drop in the contact pressure between the male and female terminals of the connector. Simply disconnecting and reconnecting the connectors once changes the condition of the connection and may result in a return to normal operation.
    Therefore, in troubleshooting, if no abnormality is found in the wire harness and connector check, but the problem disappears after the check, then the cause is considered to be in the wire harness or connectors.

Short circuit:

This could be due to a short circuit between the wire harness and the body ground or to a short inside the switch, etc.

  • When there is a short between the wire harness and body ground, check thoroughly whether the wire harness is caught in the body or is clamped properly.
This guide is based on the book edition Toyota (RM502U, 1997)