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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/systems that are not continuously monitored. Examples are the catalyst, evaporative emission (EVAP) system and thermostat.

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 test limit and maximum test limit, the ECM (PCM) interprets this as a malfunction. When the component is not malfunctioning, if the difference of the test value and test limit is very small, the component will malfunction in the near future. Perform the following procedure to view the monitor status. Although this procedure references the Lexus/Toyota diagnostic tester, it can be checked using a generic OBD II scan tool. Refer to your scan tool operator's manual for specific procedures.

  1. PERFORM MONITOR DRIVE PATTERN 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and the Techstream on.
    3. Clear DTCs (See DTC CHECK / CLEAR  ).
    4. Drive 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. Enter the following 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 and maximum test limit.
    2. If the test value is between the minimum test limit and maximum test limit, the component is functioning normally. If not, the component is malfunctioning. The test value is usually significantly more or less than the test limit. If the test value is on the borderline of the test limit, the component will 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 value by the scaling value listed below.

    A/F Sensor (Sensor 1) 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $01 $8E Multiply by 0.001 V A/F sensor deterioration level
    $01 $91 Multiply by 0.004 mA A/F sensor current

    HO2 Sensor (Sensor 2) 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $02 $07 Multiply by 0.001 V Minimum sensor voltage
    $02 $08 Multiply by 0.001 V Maximum sensor voltage
    $02 $8B Multiply by 0.001 Seconds 0.35 - 0.2 V sensor switch time
    $02 $8D Multiply by 0.001 Seconds Duration that sensor voltage drops to 0.2 V during fuel cut
    $02 $8F Multiply by 0.0003 g Maximum oxygen storage capacity

    Catalyst 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $21 $A9 Multiply by 0.0003 No dimension Oxygen storage capacity of catalyst

    Advance/Retarded Intake Side 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $35 $81 Multiply by 0.01 Seconds Forced movement of oil control valve time

    Advance/Retarded Exhaust Side 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $35 $85 Multiply by 0.01 Seconds Forced movement of oil control valve time

    EVAP 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $3D $C9 Multiply by 0.001 kPa Test value for small leak (P0456)
    $3D $CA Multiply by 0.001 kPa Test value for gross leak (P0455)
    $3D $CB Multiply by 0.001 kPa Test value for leak detection pump stuck OFF (P2401)
    $3D $CD Multiply by 0.001 kPa Test value for leak detection pump stuck ON (P2402)
    $3D $CE Multiply by 0.001 kPa Test value for vent valve stuck OFF (P2420)
    $3D $CF Multiply by 0.001 kPa Test value for vent valve stuck ON (P2419)
    $3D $D0 Multiply by 0.001 kPa Test value for reference orifice low flow (P043E)
    $3D $D1 Multiply by 0.001 kPa Test value for reference orifice high flow (P043F)
    $3D $D4 Multiply by 0.001 kPa Test value for purge VSV stuck closed (P0441)
    $3D $D5 Multiply by 0.001 kPa Test value for purge VSV stuck open (P0441)
    $3D $D7 Multiply by 0.001 kPa Test value for purge flow insufficient (P0441)

    Rear Oxygen Sensor Heater 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $42 $91 Multiply by 0.001 Ohm Oxygen sensor heater resistance bank 1 sensor 2

    Misfire 

    MONITOR RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $A1 $0B Multiply by 1 Time Total EWMA misfire count of all cylinders in last ten driving cycles
    EWMA: Exponential Weighted Moving Average
    $A1 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of all cylinders in last driving cycle is displayed.
    • While engine is running, total misfire count of all cylinders in current driving cycle is displayed.
    $A2 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 1 in last ten driving cycles
    $A2 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 1 in last driving cycle is displayed.
    • While engine is running, total misfire count of cylinder 1 in current driving cycle is displayed.
    $A3 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 2 in last ten driving cycles
    $A3 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 2 in last driving cycle is displayed.
    • While engine is running, total misfire count of cylinder 2 in current driving cycle is displayed.
    $A4 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 3 in last ten driving cycles
    $A4 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 3 in last driving cycle is displayed.
    • While engine is running, total misfire count of cylinder 3 in current driving cycle is displayed.
    $A5 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 4 in last ten driving cycles
    $A5 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 4 in last driving cycle is displayed.
    • While engine is running, total misfire count of cylinder 4 in current driving cycle is displayed.
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