Testing Fuel Pump Relay (IS300, LS430 & SC430)

For relay terminal identification, see Fig 1. If relay continuity is not as specified, replace relay and retest system.

• Continuity should exist between terminals No. 1 and 2.
• Continuity should not exist between terminals No. 3 and 4.
• Apply battery voltage across terminals No. 1 and 2. Continuity should exist between terminals No. 3 and 4.

Fig 1: Identifying Fuel Pump Relay Terminals (IS300, LS430 & SC430)

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