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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 catalysts and evaporative emission (EVAP) systems.

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 Toyota Techstream, 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 power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    5. Operate the vehicle in accordance with the applicable drive pattern described in Readiness Monitor Drive Pattern. Refer to READINESS MONITOR DRIVE PATTERN . Do not turn the power switch off.
      NOTE:

      The test results will be lost if the power switch is turned off.

  2. ACCESS MONITOR RESULT 
    1. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Result.
    2. Confirm the monitor status for each component.

      HINT: 

      The monitor status for each component is displayed in the Result column.

      • Pass: The component is functioning normally.
      • Fail: The component is malfunctioning.
    3. Display the test results and test values for a monitor by selecting the icon in the Details column for that item.
  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.

    Advance / Retarded Intake Side

    BANK 1

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

    Exhaust Gas Recirculation System

    Monitor ID Test ID Scaling Unit Description
    $31 $BD Multiply by 0.01 kPa Delta Manifold Absolute Pressure

    Air Fuel Ratio Sensor Bank 1 Sensor 1

    Monitor ID Test ID Scaling Unit Description
    $01 $91 Multiply by 0.004 mA Air fuel ratio sensor current
    $01 $93 Multiply by 0.00012 V Rich to Lean response rate deterioration level
    $01 $94 Multiply by 0.00012 V Lean to Rich response rate deterioration level
    $01 $95 Multiply by 0.001 Second Rich to Lean delay level
    $01 $96 Multiply by 0.001 Second Lean to Rich delay level

    Heated Oxygen Sensor Bank 1 Sensor 2

    Monitor ID Test ID Scaling Unit Description
    $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 - Bank 1

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

    EVAP

    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 OFF stuck (P2401)
    $3D $CD Multiply by 0.001 kPa Test value for leak detection pump ON stuck (P2402)
    $3D $CE Multiply by 0.001 kPa Test value for vent valve OFF stuck (P2420)
    $3D $CF Multiply by 0.001 kPa Test value for vent valve ON stuck (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 close stuck (P0441)
    $3D $D5 Multiply by 0.001 kPa Test value for purge VSV open stuck (P0441)
    $3D $D7 Multiply by 0.001 kPa Test value for purge flow insufficient (P0441)

    Rear Oxygen Sensor Heater

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

    Fuel System / Air Fuel Ratio Sensor Determination Bank 1

    Monitor ID Test ID Scaling Unit Description
    $81 $81 Multiply by 0.00003 No dimension Monitoring method using air fuel ratio sensor

    Fuel System / Engine Speed Function Average Bank 1

    Monitor ID Test ID Scaling Unit Description
    $81 $82 Multiply by 0.001 No dimension Monitoring method using crank angle sensor

    Misfire

    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
    $A1 $0C Multiply by 1 Time
    • When power switch on (IG), 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 power switch on (IG), 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 power switch on (IG), 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 power switch on (IG), 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 power switch on (IG), 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.

    HINT: 

    *: EWMA (Exponential Weighted Moving Average) misfire counts for last 10 driving cycles (calculated) Calculation: 0.1 x (current counts) + 0.9 x (previous average) Initial value for (previous average) = 0

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