Checking Monitor Status

The monitor results and test values can be checked with the OBD II scan tool or the hand-held tester.

The engine control module (ECM) monitors the emissions-related components such as the thermostat, catalyst converter and evaporative emissions (EVAP), and determines whether they are functioning normally or not. When finished monitoring, the ECM stores the monitor results and the test values.

The monitor result indicates whether the component is functioning normally or not. The test value is the value that was used to determine the monitor result. If the test value is outside the test limit (malfunction criterion), the ECM determines the component is malfunctioning. Some emissions-related components have multiple test values to determine monitor result. If one of these test values is outside test limit, the ECM determines the component is malfunctioning.

The test value and test limit information are described as shown in the following table. This information is included under "MONITOR RESULT" in the emissions-related DTC sections:

Thermostat 

• MID (Monitor Identification Data) is assigned to each emissions-related component.
• TID(Test Identification Data) is assigned to each test value.
• Scaling is used to calculate the test value indicated on generic OBD II scan tools.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch on (IG).
3. Turn the tester or scan tool ON.
4. Clear DTCs.
5. Allow the vehicle to drive in accordance with the applicable drive pattern described in the READINESS MONITOR DRIVE PATTERN (see READINESS MONITOR DRIVE PATTERN ).
6. Check the monitor result. Select the hand-held tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and MONITOR STATUS. The monitor result appears after the component name.
   • AVAIL indicates the component has not been monitored yet.
   • COMPL indicates the component is functioning normally.
   • INCMPL indicates the component is malfunctioning.
7. Check the test value(s). Select the hand-held tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and TEST RESULT.
8. Select the component and press ENTER. If the monitor result has been COMPL or INCMPL, the accuracy test value appears.
9. Compare the test value with the test limits, MIN and MAX.
   • If the test value is outside of the test limit, the component is malfunctioning.
   • If the test value is on the borderline of the test limit, a malfunction is concealed in the component.

     HINT:

     The monitor result might on rare occasions be COMPL 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.