Mazda CX-9 Grand Touring 2009 Manual page 1399

B+ (Ignition switch at on)
If the voltage is as specified, inspect the following:
Fuel pump continuity
Fuel pump GND
Wiring harness between fuel pump relay and PCM terminal 1V
If not as specified, inspect the following:
Fuel pump relay
Wiring harness connector (Main relay-fuel pump relay-fuel pump)
FUEL PUMP CONTROL SYSTEM INSPECTION
1. Crank the engine and verify that fuel pump relay operation sound is heard.
2. If operation sound is not heard, inspect the following:
Fuel pump relay
(See RELAY INSPECTION .)
Wiring harness and connectors (Main relay-fuel pump relay-PCM terminal 1V)
SPARK TEST
1. Disconnect the fuel pump relay.
2. Verify that each ignition coil and connector is connected properly.
3. Inspect the ignition system in the following procedure.
WARNING:
FUEL PUMP CONTROL SYSTEM INSPECTION CHART
STEP
Disconnect the ignition coil from the
spark plugs.
Remove the spark plugs.
1
Ensure that the spark plugs don't
have carbon deposits.
Are the spark plugs OK?
Inspect the spark plugs for damage, wear,
2 and proper plug gap.
Are the spark plugs normal?
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
High voltage in the ignition system can cause strong electrical
shock which can result in serious injury. Avoid direct contact
to the vehicle body during the following spark test.
INSPECTION ACTION
Yes Go to the next step.
Perform 2 times of no-load racing at 4000
No rpm for 2 min to burn off the carbon deposits.
Then repeat this step.
Yes Go to the next step.
No Replace spark plugs, then go to the next step.