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Home >> Mazda >> 2024 >> CX-90 Turbo Select >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Fuel System (VIN A)) >> Fuel Pump Unit Inspection [PYUL] >> Inspect Fuel Pump Unit >> Fuel pump operation inspection

Fuel pump operation inspection

WARNING: This page is about a different variant/trim than selected.
  1. Perform the KOEO self-test. (Refer to [DTC INSPECTION ] in the troubleshooting service information)
    • If a DTC is detected, repair the malfunctioning location according to the applicable DTC troubleshooting. (Refer to DTC TABLE in the troubleshooting service information)
  2. Remove the fuel-filler cap.
  3. Switch the main power ON (READY off) and start the engine.
  4. Switch the main power ON (READY off) and verify the following operation sounds approx. 1 s after starting the engine.
    • Fuel pump relay (OFF → ON → OFF) (See RELAY LOCATION .)
    • Fuel pump (verify operation sound directly from the 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 terminal C and fuel pump relay terminal A (short or open circuit)
    • Wiring harness between fuel pump relay terminal E and ECM terminal 2AW (short or open circuit)

    Fuel pump operation sound cannot be verified 

    • Fuel pump relay (stuck open or open circuit in internal circuit)
    • Wiring harness between positive lead-acid battery terminal and fuel pump relay terminal D (open or short circuit)
    • 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 E and fuel pump control module terminal 2F (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 control module terminal 2D and body ground (open circuit, ground point looseness or lifting)
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