Testing Air/Fuel (A/F) HTR Relay, Circuit Opening Relay, EFI Main Relay Or Starter Relay

1. Remove relay to be tested. On RX300, circuit opening relay (CIR OPN) may be located in fuse/relay box on left side of engine compartment or relay box under left side of instrument panel. On ES300, circuit opening relay is located in fuse/relay box on left side of engine compartment. On all models, A/F HTR relay, EFI main relay and starter relay are located in the main fuse/relay box on left side of engine compartment.
2. Check for continuity between relay terminals No. 1 and 2. See Fig 1 or Fig 2 . Continuity should exist. Check for continuity between relay terminals No. 3 and 5. Continuity should not exist.
3. Using jumper wires, apply battery voltage across relay terminals No. 1 and 2. Check for continuity between relay terminals No. 3 and 5 with relay energized. Continuity should exist. If continuity is not as specified, replace relay.

Fig 1: Identifying Starter Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying A/F HTR Relay, Circuit Opening Relay & EFI Main Relay Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002