Checking Monitor Status

The purpose of the monitor result (mode 06) is to allow access to the results for on-board diagnostic monitoring tests of specific components that are not continuously monitored. Examples are catalyst, evaporative emission (EVAP) and thermostat.

The monitor result allows the OBD II scan tool to display the monitor status, test value and test limit. These data are displayed after the vehicle has been driven to run the monitor. When the test value exceeds the test limit, the ECM (PCM) interprets this as a malfunction. When the component is not malfunction, if the difference of the test value and test limit is very small, the component will malfunction in near future. Perform the following instruction to view the monitor status. Although this instruction references the Lexus/Toyota diagnostic tester, it can be checked using a generic OBD II scan tool. Refer to your for specific procedures.

1. PERFORM MONITOR DRIVE PATTERN 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch and the tester ON.
   3. Clear the DTCs.
   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 monitor results will be lost if the ignition switch is turned OFF.
2. ACCESS MONITOR RESULT 
   1. Select from the tester menus: DIAGNOSIS, ENHANCED OBD II, MONITOR INFO and MONITOR RESULT. The monitor result appears after the component name.
      • INCMP: The component has not been monitored yet.
      • PASS: The component is functioning normally.
      • FAIL: The component is malfunctioning.
   2. Confirm that the component is either PASS or FAIL.
      Fig 1: Access Monitor Result Display

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Select the component and press ENTER. The accuracy test value appears when the monitor result is either PASS or FAIL.
      • VAL: Test value
      • LMT: Test limit (malfunction criterion)
      • TLT: Test limit type. If TLT is 0, the component is malfunctioning when the test value is higher than the test limit. If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
        Fig 2: Thermostat Malfunction Display

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. CHECK COMPONENT STATUS 
   1. Compare VAL with LMT. The VAL is usually significantly higher or lower than LMT.
   2. If the test value is on the borderline of the test limit, the component will malfunction in 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.

   • TID: Test Identification
   • TLT: Test Limit Type
   • CID: Component Identification

     Catalyst - A/F Sensor Type 

     RESULT INFORMATION
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $01	0	$01	Multiply by 0.0078	No dimension	Catalyst deterioration level - Bank 1: Determined by waveforms of A/F sensor and HO2S
     $01	0	$02	Multiply by 0.0078	No dimension	Catalyst deterioration level - Bank 2: Determined by waveforms of A/F sensor and HO2S

     EVAP - LEVII type 

     EVAP - LEVII TYPE
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $02	1	$01	Multiply by 0.183	mmHg	Test value of EVAP VSV stuck closed: Determined by fuel tank pressure change during vacuum introduction
     $02	0	$02	Multiply by 0.0655	Seconds	Test value of EVAP VSV stuck open: Determined by duration that fuel tank pressure is higher than criteria
     $02	0	$03	Multiply by 0.0655	Seconds	Test value of canister closed valve (CCV): Determined by duration that fuel tank pressure is lower than criteria
     $02	0	$04	Multiply by 0.0458	mmHg	Test value of 0.04 inch leak: Determined by fuel tank pressure change
     $02	0	$05	Multiply by 0.0458	mmHg	Test value of 0.02 inch leak: Determined by fuel tank pressure change

     HO2S Heater 

     HO2S HEATER REFERENCE
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $04	1	$02	Multiply by 0.000076	A	Maximum HO2S heater current - Bank 1 Sensor 2
     $04	1	$20	Multiply by 0.000076	A	Maximum HO2S heater current - Bank 2 Sensor 2

     A/F sensor - Standard Type 

     A/F SENSOR - STANDARD TYPE
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $06	0	$01	Multiply by 0.000244	No dimension	A/F sensor response rate - Bank 1
     $06	0	$10	Multiply by 0.000244	No dimension	A/F sensor response rate - Bank 2

     A/F sensor - Active A/F Control Type 

     A/F SENSOR - ACTIVE A/F CONTROL TYPE
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $06	1	$02	Multiply by 0.000039	A	A/F sensor current - Bank 1
     $06	0	$02	Multiply by 0.000039	A	A/F sensor current - Bank 1
     $06	1	$12	Multiply by 0.000039	A	A/F sensor current - Bank 2
     $06	0	$12	Multiply by 0.000039	A	A/F sensor current - Bank 2

     A/F Sensor Heater 

     A/F SENSOR HEATER
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $07	1	$01	Multiply by 0.00017	A	Maximum heater current - Bank 1
     $07	1	$10	Multiply by 0.00017	A	Maximum heater current - Bank 2

     Thermostat 

     THERMOSTAT DESCRIPTION
     
     

     TID	TLT	CID	Scaling	Unit	Description
     $08	1	$01	Multiply by 0.625 subtract 40	°C	ECT sensor output when estimated ECT reaches malfunction criteria