Fuel Pump Speed Control Inspection

If simulation function of M-MDS is used: 

1. Perform the Fuel Pump Operation Inspection.
2. Connect the M-MDS to the DLC-2.
3. Remove the fuel-filler cap.
4. Start the engine and run it is idling.
5. Turn the fuel pump speed control relay from off to on using the FPRR PID and verify that the fuel pump unit operation sound frequency at FPRR PID on is higher than off. (See ON-BOARD DIAGNOSTIC TEST .)
   • If it cannot verified, inspect for the following:
     • Fuel pump resister
     • Fuel pump speed control relay (stuck on or off) (See RELAY INSPECTION .)
     • Wiring harnesses and connectors (open or short to ground circuit at fuel pump relay terminal C-fuel pump speed control relay-fuel pump unit terminal B)

If simulation function of M-MDS is not used: 

1. Perform the fuel pump operation inspection.
2. Remove the fuel-filler cap.
3. Verify that the fuel pump unit operation sound frequency at cranking is higher than during idle.
   • If it cannot verified, inspect for the following:
     • Fuel pump resister
     • Fuel pump speed control relay (stuck on or off) (See RELAY INSPECTION .)
     • Wiring harnesses and connectors (open or short to ground circuit at fuel pump relay terminal C-fuel pump speed control relay-fuel pump unit terminal B)