Checking Monitor Status

The purpose of the monitor result (mode 06) is to allow access to the results of on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalysts, evaporative emissions (EVAP) and thermostats.

The monitor result allows the OBD II scan tool to display the monitor status, test value, minimum test limit and maximum test limit. These data are displayed after the vehicle has been driven to run the monitor.

When the test value is not between the minimum and maximum test limits, the ECM (PCM) interprets this as a malfunction. If the test value is on the borderline of the test limits, the component is likely to malfunction in the near future.

Perform the following instruction to view the monitor status. Although this instruction refers to the Lexus/Toyota diagnostic tester, a generic OBD II scan tool can also be used. Refer to your scan tool operator's manual for specific procedural information.

1. PERFORM MONITOR DRIVE PATTERN 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to the ON position and turn the Techstream on.
   3. Clear the DTCs (See DTC CHECK/CLEAR  ).
   4. Run the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern (See READINESS MONITOR DRIVE PATTERN  ). Do not turn the ignition switch off.
      NOTE: The test results will be lost if the ignition switch is turned off.
2. ACCESS MONITOR RESULT 
   1. Select the following items from the Techstream menus: Powertrain/Engine and ECT/Monitor/Result. The monitor status appears after the component name.
      • Pass: The component is functioning normally.
      • Fail: The component is malfunctioning.
   2. Confirm that the component is either Pass or Fail.
   3. Select the component and press ENTER. The accuracy test value appears if the monitor status is either Pass or Fail.
3. CHECK COMPONENT STATUS 
   1. Compare the test value with the minimum test limit (MIN LIMIT) and maximum test limit (MAX LIMIT).
   2. If the test value is between the minimum and maximum test limits, the component is functioning normally. If not, the component is malfunctioning. The test value is usually not near the test limits. If the test value is near the test limits, the component is likely to malfunction in the near future.

      HINT:

      The monitor result might on rare occasions be Pass even if the malfunction indicator lamp (MIL) is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

4. MONITOR RESULT INFORMATION 

   If you use a generic scan tool, multiply the test value by the scaling value listed below.

A/F Sensor (Sensor 1) 

HO2 Sensor (Sensor 2) 

Catalyst 

EVAP 

Misfire