B+ (Ignition switch at on)
z
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
z
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:
z
Fuel pump relay
(See
RELAY INSPECTION
.)
z
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.
FUEL PUMP CONTROL SYSTEM INSPECTION CHART
WARNING:
z
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.
STEP
INSPECTION
ACTION
1
z
Disconnect the ignition coil from the
spark plugs.
z
Remove the spark plugs.
{
Ensure that the spark plugs don't
have carbon deposits.
z
Are the spark plugs OK?
Yes Go to the next step.
No
Perform 2 times of no-load racing at 4000
rpm for 2 min to burn off the carbon deposits.
Then repeat this step.
2
z
Inspect the spark plugs for damage, wear,
and proper plug gap.
z
Are the spark plugs normal?
Yes Go to the next step.
No Replace spark plugs, then go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:06 AM
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