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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 procedures to view the monitor status. Although these procedures refer to the Lexus/Toyota diagnostic tester, the monitor status can be checked using a generic OBD II scan tool. 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 and the tester 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 . 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 on the borderline of 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 (Bank 1 Sensor 1) HO2S Bank 1 Sensor 1 

    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 (Bank 1 Sensor 2) 

    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 $8F Multiply by 0.0003 g Maximum oxygen storage capacity

    A/F Sensor Bank 2 HO2S Bank 2 Sensor 1 

    RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $05 $8E Multiply by 0.001 V A/F sensor deterioration level
    $05 $91 Multiply by 0.004 mA A/F sensor current

    HO2 Sensor (Bank 2 Sensor 2) 

    RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $06 $07 Multiply by 0.001 V Minimum sensor voltage
    $06 $08 Multiply by 0.001 V Maximum sensor voltage
    $06 $8F Multiply by 0.0003 g Maximum oxygen storage capacity

    Catalyst - Bank 1 

    RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $21 $A9 Multiply by 0.0003 No dimension Oxygen storage capacity of catalyst bank 1

    Catalyst - Bank 2 

    RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $22 $A9 Multiply by 0.0003 No dimension Oxygen storage capacity of catalyst bank 2

    EVAP 

    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 

    RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $42 $91 Multiply by 0.001 Ohm Oxygen sensor heater resistance bank 1 sensor 2
    $46 $91 Multiply by 0.001 Ohm Oxygen sensor heater resistance bank 2 sensor 2

    Secondary Air Injection (AIR) 

    RESULT INFORMATION

    Monitor ID Test ID Scaling Unit Description
    $71 $E1 Multiply by 0.01 g/sec. Test value for AIR insufficient
    $71 $E2 Multiply by 0.01 kPa Test value for AIR pump ON stuck
    $71 $E3 Multiply by 0.01 kPa Test value for AIR pump OFF stuck
    $71 $E4 Multiply by 0.01 kPa Test value for AIR valve(s) ON stuck
    $71 $E5 Multiply by 0.01 kPa Test value for AIR valve(s) OFF stuck
    $71 $E6 Multiply by 0.01 kPa Test value for AIR electrical valve
    $71 $E7 Multiply by 0.01 kPa Test value for AIR VSV bank 1
    $71 $E8 Multiply by 0.01 kPa Test value for AIR VSV bank 2
    $71 $E9 Multiply by 0.01 kPa Test value for AIR VSVs bank 1 and bank 2

    Misfire 

    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 $OB 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
    $A6 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 5 in last ten driving cycles
    $A6 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 5 in last driving cycle is displayed
    • While engine is running, total misfire count of cylinder 5 in current driving cycle is displayed
    $A7 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 6 in last ten driving cycles
    $A7 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 6 in last driving cycle is displayed
    • While engine is running, total misfire count of cylinder 6 in current driving cycle is displayed
    $A8 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 7 in last ten driving cycles
    $A8 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 7 in last driving cycle is displayed
    • While engine is running, total misfire count of cylinder 7 in current driving cycle is displayed
    $A9 $0B Multiply by 1 Time Total EWMA misfire count of cylinder 8 in last ten driving cycles
    $A9 $0C Multiply by 1 Time
    • When ignition switch is ON, total misfire count of cylinder 8 in last driving cycle is displayed
    • While engine is running, total misfire count of cylinder 8 in current driving cycle is displayed
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