Poor Fuel Economy (VIN Y): Outline
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POOR FUEL ECONOMY (VIN Y) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Poor fuel economy |
| Description |
- The fuel consumption is high compared to the customer's expectations or the previous fuel consumption.
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| Possible cause |
NOTE:
- The perceived poor fuel economy condition has two causes; the vehicle conditions and how the driver uses the vehicle. Especially, it relies heavily on how the driver uses the vehicle.
- Engine oil malfunction
- Improper engine oil level
- Engine oil contamination
- Improper engine oil viscosity
- Low engine compression
- Ignition system malfunction
- Improper engine coolant level
- Tire pressure malfunction
- Improper tires, wheels (large size, irregular size)
- Improper ATF level
- Brake dragging
- EGR system malfunction
- Engine operation time is longer than traveled distance
- Vehicle is driven in congested traffic frequently
- Vehicle left idling for long periods
- Amount of fuel injection increases
- Vehicle is carrying excess items (luggage)
- Frequent acceleration/deceleration
- Frequently driving uphill
- Travel distances are short (engine does not warm up)
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| System wiring diagram |
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