Fuel Pump Operation Inspection
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the M-MDS to the DLC-2.
- Perform the KOEO self-test. (See DTC INSPECTION
.)
- If a DTC is detected, repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-G (US))] .)
- Remove the fuel-filler cap.
- Switch the ignition ON (engine off).
- Verify the following operation sounds for approx. 1 s after the ignition is switched ON (engine off).
- Fuel pump relay (OFF → ON → OFF) (See RELAY LOCATION (US) .)
- Fuel pump (Verify direct operation sound from fuel-filler opening)
- If the operation sounds cannot be verified, inspect the following and repair or replace the malfunctioning location.
Fuel pump relay operation sound cannot be verified
- Fuel pump relay (stuck open/closed)
- Wiring harness between IG1 relay and fuel pump relay terminal E (short, open circuit)
- Wiring harness between fuel pump relay terminal A and PCM terminal 2AW (short, open circuit) Fuel pump operation sound cannot be verified
- Fuel pump relay (stuck open or open circuit in internal circuit)
- Wiring harness between battery and fuel pump relay terminal D
- Wiring harness between fuel pump relay terminal C and fuel pump control module terminal 2B (short, open circuit)
- Fuel pump unit (inspect for continuity) (See CONTINUITY INSPECTION .)
- Wiring harness between fuel pump unit terminal A and fuel pump control module terminal 2C (short, open circuit)
- Wiring harness between fuel pump unit terminal D and fuel pump control module terminal 2E (short, open circuit)
- Wiring harness between fuel pump unit terminal B and fuel pump control module terminal 2A (short, open circuit)
- Wiring harness between fuel pump unit terminal E and fuel pump control module terminal 2F (short, open circuit)
- Wiring harness between fuel pump control module terminal 2D and body ground (open circuit, ground point looseness or lifting)
- If the inspection items are normal, inspect the fuel pump control module. (See FUEL PUMP CONTROL MODULE INSPECTION .)