LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 1989 >> Camry Base, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Basic Testing - EFI) >> Fuel Pump Control Circuit Test >> Circuit Opening Relay

Circuit Opening Relay

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1990 Toyota Tercel, 1990 Toyota Supra, 1990 Toyota Pickup, 1990 Toyota Land Cruiser, and 1990 Toyota Cressida. However, it is still accessible from the selected car via links, so may be relevant.
  1. Circuit opening relay controls fuel pump circuit. ECU receives an input signal at STA terminal when engine is cranking. This same starter signal is also applied to terminal STA of circuit opening relay.
  2. Starter signal energizes circuit opening relay during cranking, which in turn activates the fuel pump. On all except Celica, Corolla (4A-FE), Supra (7M-GTE) and Tercel, when airflow meter senses airflow to engine, fuel pump switch in airflow meter provides the relay ground. On Celica, Corolla (4A-FE), Supra (7M-GTE) and Tercel, circuit opening relay is grounded by ECU through FC terminal.
scientia non olet · About LEMON Manuals