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On-Board Diagnostics (OBD) Basics Diagnostic Service Definitions

4.4.4 Service $04:

Clear/Reset Emission-related Diagnostic Data

NOTE:

i It is recommended to perform the Clear Code/Reset function with the engine off and the ignition

switched on.

The purpose of this service is to clear codes and turn off the MIL. It is recommended to print the

DTCs before erasing them, for comparison after repairs are made.

Clearing the code memory erases all diagnostic information stated in “Reset Information” below:

The following may occur as well:

• It may also erase engine management adaptive memory (some vehicle manufacturers only)

when codes are cleared. Depending on the vehicle, adaptive memory may not correct itself

without extensive driving.

• Other manufacturer specific actions for clearing and setting may also occur in response to this

request message.

• Normally the MIL automatically turns off after a successful repair, if emissions are normal.

Refer to Repair validation on page 12.

IMPORTANT:

For safety and/or technical design reasons, some ECMs may not respond to this service under all

conditions.

NOTE:

i In most cases, once a MIL is deactivated, the original code remains in memory until forty to eighty

warm-up cycles are completed without the fault reappearing.

Table 4-3

Reset Information

Service Items to reset

$01

Status of system monitoring tests

Number of diagnostic trouble codes

Distance travelled while MIL is activated

Number of warm-ups since DTCs cleared

Distance travelled since DTCs cleared

Time run by the engine while MIL is activated

Time since diagnostic trouble codes cleared

$02

Diagnostic trouble code for freeze frame data

Freeze frame data

$03 Confirmed diagnostic trouble codes

$05 Oxygen sensor test data

$06 Specific on-board monitoring test results

$07 Pending diagnostic trouble codes

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