62
OBD Service $04
Functional description
The purpose of this service is to provide a means for the external test equipment to command ECUs to clear all emission-related
diagnostic information This includes:
• MIL and number of diagnostic trouble codes (can be read with Service $01, PID $01)
• Clear the I/M (Inspection/Maintenance) readiness bits (Service $01, PID $01 )
• Confirmed diagnostic trouble codes (can be read with Service $03)
• Pending diagnostic trouble codes (can be read with Service $07)
• Diagnostic trouble code for freeze frame data (can be read with Service $02, PID $02)
• Freeze frame data (can be read with Service $02)
• Oxygen sensor test data (can be read with Service $05)
• Status of system monitoring tests (can be read with Service $01, PID $01)
• On-board monitoring test results (can be read with Service $06)
• Distance travelled while MIL is activated (can be read with Service $01, PID $21)
• Number of warm-ups since DTCs cleared (can be read with Service $01, PID $01)
• Distance travelled since DTCs cleared (can be read with Service $01, PID $01)
• Time run by the engine while MIL is activated (can be read with Service $01, PID $4D)
• Time since diagnostic trouble codes cleared (can be read with Service $01, PID $01)
Other manufacturer-
specific “clearing/resetting” actions may also occur in response to this request message.
For safety and/or technical design reasons, some ECUs may not respond to this service under all conditions.
All ECUs shall respond to this service request with the ignition ON and with the engine not running.