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FAQ: GM Code Scanner CP9001 |
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What are I/M Monitors? |
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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 Monitor | Definition | | Misfire | Misfire | | Fuel Sys | Fuel System | | Comprehens | Comprehensive Components | | Catalyst | Catalyst | | Heated Cat | Heated Catalyst | | Evap Sys | Evaporative System | | Sec Air | Secondary AIR | | A/C Refrig | Air Conditioning Refrigerant | | O2 Sensor | Oxygen Sensor | | HO2 Sensor | Heated Oxygen Sensor | | EGR Sys | Exhaust 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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