Jeep Cherokee (KL): Onboard diagnostic system - obd ii
Your vehicle is equipped with a sophisticated Onboard Diagnostic system called OBD II. This system monitors the performance of the emissions, engine, and automatic transmission control systems. When these systems are operating properly, your vehicle will provide excellent performance and fuel economy, as well as engine emissions well within current government regulations.
If any of these systems require service, the OBD II system will turn on the Malfunction Indicator Light (MIL). It will also store diagnostic codes and other information to assist your service technician in making repairs. Although your vehicle will usually be drivable and not need towing, see your authorized dealer for service as soon as possible.
CAUTION!
- Prolonged driving with the MIL on could cause
further damage to the emission control system. It
could also affect fuel economy and driveability.
The vehicle must be serviced before any emissions tests can be performed.
- If the MIL is flashing while the engine is running, severe catalytic converter damage and power loss will soon occur. Immediate service is required.
Loose Fuel Filler Cap Message
If the vehicle diagnostic system determines that the fuel filler cap is loose, improperly installed, or damaged, a "CHECK GASCAP" message will be displayed in the Electronic Vehicle Information Center (EVIC) or Driver Information Display (DID). Refer to "Electronic Vehicle Information (EVIC) or Driver Information Display (DID)" in "Understanding Your Instrument Panel" for further information. Tighten the fuel filler cap until a "clicking" sound is heard. This is an indication that the fuel filler cap is properly tightened. Refer to "Onboard Diagnostic System" in "Maintaining Your Vehicle" for further information.
Emissions inspection and maintenance programs
Other materials:
Diagnosis and testing
Visual inspection
A visual inspection for loose, disconnected or incorrectly
routed wires and hoses should be made. This
should be done before attempting to diagnose or service
the fuel injection system. A visual check will
help spot these faults and save unnecessary test and
diagnostic time. A ...