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FAQ: GM Code Scanner CP9001
 
How do I know if my vehicle is OBD I or OBD II on-board diagnostics equipped?
 
What is the difference between OBD I and OBD II cars?
 
What is OBD?
 
What are DLCs?
 
Common Chrysler OBD II (P1) Enhanced Codes
 
Will the Actron Code Scanners and/or Scan Tools retrieve Anti-Lock Brake or Airbag codes?
 
Do I need adapters for different vehicles?
 
What are I/M Monitors?
 
What is MIL Status?
 
What are Pending Codes?
 
What is the Erase Codes function?
 
Which Actron Code Scanners and/or Scan Tools work on 1994 & 1995 GM vehicles?
 
What are PIDs?
 
What are DTCs?
 
What are Enhanced OBD II codes?
 
Common Generic OBD II (P0) Codes
 
Common GM OBD II (P1) Enhanced Codes
 
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  What are I/M Monitors?
  I/M (Inspection & Maintenance) Monitors test the operation of emission-related systems or components and detect out-of-range values. The vehicle may have to be operated under certain conditions to complete an I/M Monitor test. Currently, there are eleven I/M Monitors defined by the U.S. Environmental Protection Agency (EPA). Not all monitors are supported by all vehicles.
These I/M Monitors are:

I/M MonitorDefinition
MisfireMisfire
Fuel SysFuel System
ComprehensComprehensive Components
CatalystCatalyst
Heated CatHeated Catalyst
Evap SysEvaporative System
Sec AirSecondary AIR
A/C RefrigAir Conditioning Refrigerant
O2 SensorOxygen Sensor
HO2 SensorHeated Oxygen Sensor
EGR SysExhaust Gas Recirculation System

  • A monitor status of 'Ready' means that the required driving conditions for that monitor have been met and it passed.
  • A monitor status of 'Not Ready' means that the required driving conditions for that monitor have not been completed or it did not pass.
  • A monitor status of 'N/A' means that the vehicle does not support that monitor.

Several state emission check programs require all I/M Monitors to be in a status of Ready or N/A in order for the vehicle to pass. You can use Actron Code Scanners or Scan Tools to find out if your vehicle is ready before going to your state emission test.
 
 
   
   
   
 
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