2004 Jeep Grand Cherokee Owner's Manual - Page 130

130 UNDERSTANDING YOUR INSTRUMENT PANEL 7. Oil Pressure Gage Indicates the engine oil pressure. This gage does not measure oil level. Pressure varies with engine speed, temperature, and oil viscosity. Normal oil pressure will be midway between the lowest and highest limit marks. 8. Sentry Key Indicator Light - If Equipped Refer to "Sentry Key Immobilizer System" in Section 2 of this manual for more information. Certain conditions such has a loose or missing gas cap, poor fuel quality, etc. may illuminate the light after engine start. The vehicle should be serviced if the light stays on through several typical driving cycles. In most situations, the vehicle will drive normally and will not require towing. When the engine is running, the "Malfunction Indicator Light" may flash to alert of serious conditions that could lead to immediate loss of power or severe catalytic converter damage. The vehicle should be serviced as soon as possible if this occurs. 10. Cruise Indicator Light This indicator lights when the electronic speed control system is turned ON. 11. Check Gages Warning Light This light illuminates when the voltmeter, oil pressure, or temperature gages indicate a reading 9. Malfunction Indicator Light This light is part of an onboard diagnostic system called OBD II which monitors engine and automatic transmission control systems. This light will illuminate when the ignition is in the ON position before engine start. If the bulb does not come on when turning the ignition key from OFF to ON, have the condition checked promptly.