W/Harness Inspection

P0231 Fuel Pump Secondary Circuit Low

Inspection/Repair - W/Harness Inspection

Terminal & Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?






Control Circuit Inspection

Check Open or Short in control circuit
1. IG KEY "OFF".
2. Disconnect fuel pump relay.
3. IG KEY "ON" & ENG "OFF"
4. Measure the voltage between control terminal of fuel pump relay harness connector and chassis ground.

Specification : Approx 3.5 V




5. Is the measured voltage within specification?