Fuel Pump Control System Inspection

If simulation function of M-MDS is used: 

1. Switch the ignition to ON (engine off).
2. Access the FP PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST .)
3. Turn the fuel pump relay from off to on and inspect if the operation sound of the fuel pump relay is heard.
   • If no operation sound is heard, inspect the fuel pump relay. (See RELAY INSPECTION [MZR 2.0, MZR 2.5, MZR 2.3 DISI TURBO] .)
   • If the fuel pump relay is normal, inspect the following:
     • Wiring harness and connectors (Ignition switch-Fuel pump relay-PCM terminal 1H) (vehicles without advanced keyless entry and push button start system)
     • Wiring harness and connectors (Relay block-Fuel pump relay-PCM terminal 1H) (vehicles with advanced keyless entry and push button start system)

If simulation function of M-MDS is not used: 

1. Crank the engine and verify that the fuel pump relay operation sound is heard.
2. If the operation sound is not heard, inspect the following:
   • Fuel pump relay (See RELAY INSPECTION [MZR 2.0, MZR 2.5, MZR 2.3 DISI TURBO] .)
   • Wiring harness and connectors (Ignition switch-Fuel pump relay-PCM terminal 1H) (vehicles without advanced keyless entry and push button start system)
   • Wiring harness and connectors (Relay block-Fuel pump relay-PCM terminal 1H) (vehicles with advanced keyless entry and push button start system)