LS 400 V8-4.0L (1UZ-FE) (1990)
Fuel Pump Relay: Testing and Inspection
Circuit Opening Relay
Circuit Opening Relay Inspection
Checking Relay Continuity
- Remove relay.
- Check for continuity between terminal ST and E1.
Desired - Continuity
- Check for continuity between terminal IG and FC.
Desired - Continuity
- Check for continuity between terminal B and FP.
Desired - No continuity
- Replace relay if desired results are not achieved.
Circuit Opening Relay Inspection
Checking Relay Operation
- Apply battery voltage across relay terminals ST and E1.
- Check for continuity between terminal B and FP.
Desired - Continuity
Circuit Opening Relay Inspection
- Apply battery voltage across relay terminals IG and FC.
- Check for continuity between terminal B and FP.