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SAFETY MAINTENANCESETUP OPERATIONOVERVIEW
Control Modules
Control Modules are individual computers that operate and monitor different systems
in the vehicle� Control Modules vary depending on manufacturer�
ID codes are assigned to each Control Module, which are defined by the vehicle’s Communication Protocol�
For example, a vehicle may use ID code $7E8 for the PCM and $7E9 for the TCM�
Control Module Control Module Definition
PCM/ECU Powertrain Control Module/Engine Control Unit
TCM Transmission Control Module
Common Control Modules
I/M Monitors
Inspection and Maintenance diagnostic tests that the Control Modules
perform on specific sub-systems of the vehicle�
There are two types of Monitors:
• Continuous: Monitors that perform tests
all the time while the engine is running�
• Non-Continuous: Monitors that require
specific operating conditions to be met
during a Drive Cycle in order for the
Monitors to run their testing sequences�
Note: Not all Monitors are supported by all vehicles�
Gasoline Engine Monitors
Continuous
MIS – Misfire
FUEL – Fuel System
CCM – Comprehensive Components
Non-Continuous
CAT – Catalyst
HCAT – Heated Catalyst
EVAP – Evaporative System
AIR – Secondary Air System
O2S – Oxygen Sensors
HTR – Oxygen Sensor Heater
EGR – EGR System
Diesel Engine Monitors
Continuous
MIS – Misfire
FUEL – Fuel System
CCM – Comprehensive Components
Non-Continuous
HCCAT – NMHC Catalyst
NCAT – NOx Aftertreatment
BP – Boost Pressure System
EGS – Exhaust Gas Sensor
PM – PM Filter
EGR – EGR System
Diagnostic Test Modes
Diagnostic Test Modes as described in the latest OBD II standard SAE J1979�
Note: Not all Modes are supported by all vehicles�
$01 - Request Current Powertrain Diagnostic Data
$02 - Request Powertrain Freeze Frame Data
$03 - Request Emission-Related Stored DTCs
$04 - Clear/Reset Emission-Related
Diagnostic Information
$05 - Request Oxygen Sensor Monitoring Test
Results (2007 and older vehicles only)
$06 - Request On-Board Monitoring Test
Results for Specific Monitored Systems
$07 - Request Emission-Related Stored DTCs Detected
During Current or Last Completed Driving Cycle
$08 - Request Control of On-Board
System, Test or Component
$09 - Request Vehicle Information
$0A - Request Emission-Related Permanent DTCs
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