MODE $06 Introduction

MODE $06 is one of 15 modes available to Global OBD II. It provides monitor test results for non-continuous monitors and sometimes continuous monitors. MODE $06 requests the ECM to view monitor test results reported after the test runs.

The ECM compares test results to the limits and reports a Pass or Fail result to the scan tool for each monitored system and component.  This MODE will report results in one trip if the monitor runs. They’re stored and are not live values.

How can it help diagnose vehicle emission-related concerns? MODE $06 monitor test results can help confirm the success of repairs for a non-continuous. MODE $06 test values (and pending DTCs) are available to the technician on a two-trip monitor’s first trip. MODE $06 test results can indicate if a monitored system (component) is close to failing a monitor test.

MODE $06 Terminology

Pre-CAN Systems: 

  • TID = Test Identification – The system (EVAP, CAT, O2, EGR, etc.) being tested. 
  • CID = Component Identification – The component or area of the system being tested.

The problem with pre-CAN MODE $06 was that TID/CID was not standardized. The following chart shows the TID/CID for a Toyota/Lexus. These numbers will be completely different when looking at other manufacturers.

CAN "C" Equipped Systems: 

  • MID = Monitor Identification: The non-continuous system (EVAP, CAT, O2, EGR, VVT, AIR) or continuous system (Misfire, Fuel system, etc.) being tested. 
  • TID = Test Identification – Specific monitor test being tested.

The chart shown below identifies MIDS for CAN "C" systems. Regardless of the manufacturer, these MIDS are standardized for all vehicles.  Some scan tools will report them by MID and not use the Monitor ID name. Some scan tools will report them using the MID and the Monitor name. Regardless, this chart applies to all CAN "C" vehicles. 


  • Test Limit Type: To pass a test, the value must be either a minimum or maximum value (or between a min/max value) 
  • Hexadecimal ($): Numeric/Alpha unit that indicates a specific TID/CID or test value (Example: $02) 
  • Raw Data: Test data shown in a decimal number indicating the actual test results. 
  • Manufacturer’s Conversion: A value supplied by the manufacturer to convert this data to values that can be used to diagnose a system (volts, Ohms, amps, inches of mercury, etc.). 
  • Test Value: = Actual test results. 
  • Test Result: = Indicates whether the system/component passed or failed a test.

MODE $06 Reporting Formats

Pre-CAN systems: Here is how the PCM and Scan Tool report the Test Results. 

Step 1: The PCM communicates in Hexadecimal, a combination of numbers and letters. 

Step 2:  The Scan Tool reports the results in Decimal format.  It does not show the test's name or the result's actual values.

Step 3:  The scan tool reports the monitor test name and unit value. Before CAN, this required using a manufacturer’s scan tool because unit conversion numbers differed. There was no way for an aftermarket scan tool manufacturer to keep up with the changes.