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Item 57740
SAFETY
MAINTENANCE
SETUP
OPERA
TION
OVER
VIEW
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
