Mazda CX-9 Grand Touring 2009 Manual page 1355

DIAGNOSTIC PROCEDURE
NO.14 POOR FUEL ECONOMY (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
Inspect for the following:
Air cleaner element for
contamination
ATF level
1 Fuel quality
Coolant level
Brake dragging
Are all items normal?
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON
2 position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Access ECT PID.
Drive vehicle while monitoring PID.
3 (See PCM INSPECTION [MZI-
3.7] .)
Is PID within specification?
Perform the spark test.
(See ENGINE CONTROL
SYSTEM OPERATION
4
INSPECTION [MZI-3.7].)
Is strong blue spark visible at each
cylinder?
Install the fuel pressure gauge
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
(See BEFORE SERVICE PRECAUTION [MZI-3.7] .)
(See AFTER SERVICE PRECAUTION [MZI-3.7] .)
CAUTION:
Disconnecting/connecting quick release connector without cleaning it
may cause damage to fuel pipe and quick release connector. Always
clean quick release connector joint area before
disconnecting/connecting, and make sure that it is free of foreign
material.
RESULTS
Yes
No
Yes
No
Yes
No
Yes
No
Yes
ACTION
Go to the next step.
Service if necessary.
Repeat Step 1.
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No DTC is displayed:
Go to the next step.
Go to the next step.
Inspect for coolant leakage, cooling fan and
condenser fan operations or thermostat
operation.
Go to the next step.
Repair or replace the malfunctioning part
according to spark test result.
Go to the next step.
Low: