Mazda CX-9 Grand Touring 2009 Manual page 1667

NOTE:
To improve start ability, the fuel pump control operates the fuel pump unit
when the ignition switch is turned to the ON position. Due to this, fuel
pressure is rapidly increased and fuel control is stabilized.
OPERATION TEST
1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel
from spilling from the fuel system. (See BEFORE SERVICE PRECAUTION [MZI-3.7].)
2. Remove the fuel-filler cap. (See FUEL TANK REMOVAL/INSTALLATION [MZI-3.7].)
3. Start the fuel pump using the following procedure:
Using M-MDS
1. Connect the M-MDS to the DLC-2.
2. Turn the ignition switch to the ON position.
Fig. 32: Connecting M-MDS To DLC-2
Courtesy of MAZDA MOTORS CORP.
3. Using the simulation function FP, verify that operation sound is heard from the fuel pump when FP is
turned from OFF to ON.
If the operation sound cannot be verified, measure the voltage at fuel pump wiring harness-side
connector terminal B.
If as specified, inspect the following:
If not within the specification, inspect the following:
2008 Mazda CX-9 Grand Touring
2008 ENGINE Fuel System (MZI-3.7) - Mazda CX-9
is turned to the ON position.
Fuel pump continuity
Fuel pump relay
Wiring harnesses and connectors between battery-fuel pump relay-fuel pump