Ram-trucks 2013 3500 - CNG Supplement User Manual download pdf (Page 17)

3. Malfunction Indicator Light (MIL)

The Malfunction Indicator Light (MIL) is part

of an onboard diagnostic (OBDII) system

which monitors the emissions and engine con-

trol system. If the vehicle is ready for emissions

testing, the light will come on when the ignition is first

turned on and remain on, as a bulb check, until the

engine is started. If the vehicle is not ready for emissions

testing the light will come on when the ignition is first

turned on and remain on for 15 seconds, then blink for

5 seconds, and remain on until the vehicle is started.

If the bulb does not come on during starting, have the

condition investigated promptly.

If this light comes on and remains on while driving, it

suggests a potential engine control problem and the need

for system service.

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 Malfunction Indicator

Light (MIL) on could cause damage to the engine

control system. It also could affect fuel economy and

driveability. If the MIL is flashing, severe catalytic

converter damage and power loss will soon occur.

Immediate service is required.

WARNING!

A malfunctioning catalytic converter, as referenced

above, can reach higher temperatures than in normal

operating conditions. This can cause a fire if you

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UNDERSTANDING YOUR INSTRUMENT PANEL 15

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Ram-trucks 2013 3500 - CNG Supplement User Manual Page 17