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On-Board Diagnostics (OBD) Basics Diagnostic Services Introduction
4.3 Diagnostic Services Introduction
The OBD program is divided into several sub programs, called Services:
• Service $01: on page 13 is used to display current data
• Service $02: on page 13 is used to access powertrain freeze frame data
• Service $03: on page 14 is used to display emission related DTCs
• Service $04: on page 16 is used to clear or reset emission-related diagnostic data
• Service $05: on page 17 is used to display oxygen sensor monitoring test results
• Service $06: on page 20 is used to display specific monitored systems test results
• Service $07: on page 22 is used to display emission related DTCs detected during current or
last completed drive cycle
• Service $08: on page 23 is used to access on-board activation tests
• Service $09: on page 23 is used to access vehicle information and performance tracking
• Service $0A: on page 24 is used to display emission related DTCs with permanent status
4.3.1 Readiness Monitor Test Status
OBD-II/EOBD stipulates the monitoring (continuous or non-continuous) of the functions of the
following emission control related subsystems):
i Not all data is applicable or supported by all vehicles.
Each vehicle manufacturer has unique monitor test criteria. The Readiness Test Status indicates
whether a particular diagnostic monitor or function passed its specific test criteria and was found
to be within specification.
Monitors should run and set the Readiness Test Status during normal vehicle operation. The
OBD-II Drive Cycle (Figure 4-1) can be used to drive the vehicle in a prescribed manner.
Table 4-1
Continuous or Non-continuous monitors
Readiness Monitor Remark
Misfire monitoring Continuous
Fuel system monitoring Continuous
Comprehensive component monitoring Continuous
Catalyst monitoring †
Heated catalyst monitoring †
Evaporative system monitoring †
Secondary air system monitoring †
A/C system refrigerant monitoring †
Oxygen sensor monitoring †
Oxygen sensor heater monitoring †
EGR system monitoring †
† Will only be monitored if the correct conditions are met.
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