Fuel Pump (Low-pressure Side) Operation Inspection

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

Connect the M-MDS to the DLC-2.
Remove the fuel-filler cap.
Switch the ignition ON (engine off).
Turn the fuel pump relay from off to on using the FP PID and inspect if the operation sound of the fuel pump is heard. (See ON-BOARD DIAGNOSTIC TEST .)
- If operation sound is heard, fuel pump is normal.
- If no operation sound is heard, proceed to the next step.
Measure the voltage at the wiring harness side fuel pump unit terminal A with the FP PID turned on.
- If the voltage is as specified, inspect the following:
  - Fuel pump continuity
  - Fuel pump ground
  - Wiring harness between the fuel pump relay and PCM terminal 2AQ
- If not as specified, inspect the following:
  - Fuel pump relay (See RELAY INSPECTION .)
  - Wiring harness connector (Battery-Fuel pump relay-Fuel pump control module-Fuel pump unit)
  Specification
  
  8.0-11.5 V (Ignition switched ON)