Checks
| Action
|
Definition: Fuel economy, as measured by an actual road test, is noticeably
lower than expected. Also, the economy is noticeably lower than it was on
this vehicle at one time, as previously shown by an actual road test.
|
Preliminary
Checks
|
| • | Check the air cleaner element (filter) for dirt or being plugged. |
| • | Visually (physically) check the vacuum hoses for splits, kinks,
and proper connections as shown on the Vehicle Emission Control Information
label. |
| • | Check the owner's driving habits for the following items: |
| • | The operation of the thermostatic air cleaner. |
| - | The A/C ON full time (Defroster mode ON)? |
| - | The tires for being at the correct air pressure. |
| - | Excessively heavy loads being carried? |
| - | The acceleration too much, too often? |
| • | Suggest to the owner to fill the fuel tank and to recheck the
fuel economy. |
| • | Suggest to the driver to refer to Important Facts on Fuel Economy
in the owner's manual. |
|
Fuel System Checks
|
- Check the fuel type, quality, and alcohol content. Refer to
Alcohol/Contaminants-in-Fuel Diagnosis
.
- Check the fuel pressure . Refer to
Fuel System Diagnosis
.
|
Ignition System Checks
|
| • | Check the spark plugs. Remove the spark plugs and check for the
following: |
| • | Check for an open Ignition Control (IC) circuit. |
| • | Check the ignition wires for the following items: |
| • | Check the Knock Sensor (KS) system operation. |
|
Cooling System Checks
|
| • | Check the engine coolant level. |
| • | Check the engine thermostat for always being open or for the wrong
heat range. |
|
Additional Checks
|
- Check the transmission shift pattern. Refer to Transmission Controls
section.
- Check for Torque Converter Clutch (TCC) operation. Refer to
Functional Test
.
- Check for proper calibration of the speedometer.
- Check for dragging brakes.
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