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On-Board Diagnostics (OBD) Basics Diagnostic Service Definitions

The MIL is located in the instrument panel. The MIL may display a symbol of an engine and should

light up as soon as the ignition is switched on. Three different states are possible when the engine

is running:

1. OFF: no emission limits exceeded.

2. ON: at least one OBD-II/EOBD emission limit exceeded.

3. Blinking: possibility of damage to the catalytic converter.

Figure 4-2

Example of Malfunction Indicator Lamp

NOTE:

i The MIL may also be called the “Check Engine” lamp.

The ECM transmits the status of the Malfunction Indicator including the identification of the ECM

that commanded the MIL to turn on.

NOTE:

i The MIL status indicates “off” during the ignition key on, engine off instrument panel bulb check

unless the MIL has been commanded “on” for a detected malfunction.

4.4 Diagnostic Service Definitions

4.4.1 Service $01:

Display Current Data

The ECMs transmit the data value stored by the system. The data is commonly called PID

(Parameter IDentification). All of the sensors parameters show the actual readings. Not default or

substitute values used by the system, because of a fault with that sensor.

Depending on the ECM and amount of parameters selected, data update rates may vary. Use

Custom Data List to select the parameters to be displayed in Service $01. The fewer data

parameters were selected, the faster the update rate.

4.4.2 Service $02:

Powertrain Freeze Frame Data

Engine conditions are stored by the ECM at the time a Monitor detects an emission-related fault.

A “Freeze Frame” is such a group of captured information.

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