Readiness Monitor Drive Pattern

• The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-related components and report any detected abnormalities in the form of Diagnostic Trouble Codes (DTCs). Since the various components need to be monitored during different driving conditions, the OBD II system is designed to ran separate monitoring programs called Readiness Monitors. Many state Inspection and Maintenance (I/M) programs require that vehicles complete their Readiness Monitors prior to beginning an emissions test.
• The current status of the Readiness Monitors can be seen by using the hand-held tester with version 9.0 software (or newer), or a generic OBD II Scan tool.
• To view the Readiness Monitor status using the hand-held tester, select "Monitor Status" from the Enhanced OBD II Menu.
• A status of "complete" indicates that the necessary conditions have been met to run the performance tests for the related Readiness Monitor.
• The Readiness Monitor will be reset to "incomplete" if:
  • ECM has lost power (battery or fuse).
  • DTCs have been cleared.
  • The conditions for running the Readiness Monitor have not been met.
• In the event that any Readiness Monitor shows "incomplete", follow the appropriate Readiness Monitor Drive Pattern to change the readiness status to "complete."
  CAUTION: Strict observance of posted speed limits, traffic laws, and road conditions are required when performing these drive patterns.
  NOTE: These drive patterns represent the fastest method to satisfy all necessary conditions which allow the specific readiness monitor to complete.
  In the event that the drive pattern must be interrupted (possibly due to traffic conditions or other factors) the drive pattern can be resumed, and in most cases, the readiness monitor will still set to complete.
  To ensure rapid completion of readiness monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).

Fig 1: Catalyst Monitor (O2S Type) Drive Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Preconditions

   The monitor will not run unless:

   • MIL is OFF.
   • Engine Coolant Temperature (ECT) is 176°F (80°C) or greater.
   • Intake Air Temperature (IAT) is 14°F (-10°C) or greater,
     NOTE: 2002 and later MY vehicles:

     The readiness test can be completed in cold ambient conditions (less than 14°F / -10°C), if the drive pattern is repeated a second time after cycling the ignition off.

2. Drive Pattern
   1. Connect the OBD II scan tool to DLC3 to check monitor status and preconditions.
   2. Drive vehicle at 40 to 55mph (64 to 88km/h) for approximately 3 minutes.
      NOTE: Drive with smooth throttle operation and avoid sudden acceleration.
      If IAT is less than 50°F (10°C) when starting engine, continue to drive vehicle at 40 to 55mph (64 to 88km/h) for approximately 4 minutes.
   3. Drive vehicle at 35 to 45mph (56 to 72km/h) for approximately 7 minutes.
      NOTE: Drive with smooth throttle operation and avoid sudden deceleration as much as possible with the throttle fully closed.
   4. If readiness status dose not switch to complete, ensure preconditions are met, turn ignition off, and then repeat steps (2) and (3).
   5. Release pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
   6. Start the engine and immediately begin driving as directed.

1. Cold Soak Preconditions

   The monitor will not run unless:

   • MIL is OFF.
   • Fuel level is approximately 1/2 to 3/4.
   • Altitude is 7800 feet (2400m) or less.
2. Cold Soak Procedure

Let vehicle cold soak for 8 hours or until the difference between IAT and ECT becomes less than 13°F (7°C).

Fig 2: EVAP Monitor (Vacuum Pressure Monitor) - Drive Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Preconditions

   The monitor will not run unless:

   • MIL is OFF.
   • Fuel level is approximately 1/2 to 3/4.
   • Altitude is 7800 feet (2400 m) or less. (NOTE for 2002 and later MY vehicles: The readiness test can be completed in cold ambient conditions (less than 40°F / 4.4°C) and/or at high altitudes (more than 7800 feet / 2400m) if the drive pattern is repeated a second time after cycling the ignition off.)
   • Engine Coolant Temperature (ECT) is between 40°F and 95°F (4.4°C and 35°C).
   • Intake Air Temperature (IAT) is between 40°F and 95 °F (4.4°C and 35°C). (NOTE for 2002 and later MY vehicles: The readiness test can be completed in cold ambient conditions (less than 40°F / 4.4°C) and/or at high altitudes (more than 7800 feet / 2400m) if the drive pattern is repeated a second time after cycling the ignition off.)
   • Cold Soak Procedure has been completed.
   • Before starting the engine, the difference between ECT and IAT must be less than 13°F (7°C).
   NOTE: Examples:

   • Scenario 1

     ECT = 75°F (24°C)

     IAT = 60°F (16°C)

     Difference between ECT and IAT is 15°F (8°C).

     --> The monitor will not run because difference between ECT and IAT is greater than 13°F (7°C).

   • Scenario 2

     ECT = 70°F (21°C)

     IAT = 68°F (20°C)

     Difference between ECT and IAT is 2°F (1°C).

     --> The monitor will run because difference between ECT and IAT is less than 13°F (7°C).

   NOTE: For 2002 and later MY vehicles:

   The readiness test can be completed in cold ambient conditions (less than 40°F / 4.4°C) and/or at high altitudes (more than 7800 feet / 2400m) if the drive pattern is repeated a second time after cycling the ignition off.

2. Drive Pattern
   1. Connect the OBD II scan tool to DLC3 to check monitor status and preconditions.
   2. Release pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
   3. Start the engine and allow it to idle until ECT becomes 167°F (75°C) or greater.
   4. Run the engine at 3,000 rpm for about 10 seconds.
   5. Allow the engine to idle with the A/C ON (to create slight load) for 15 to 50 minutes.
   NOTE: If the vehicle is not equipped with A/C, put a slight load on the engine by doing the following :

   • Securely set the parking brake.
   • Block the drive wheels with wheel chocks.
   • Allow the engine to idle for 15 to 50 minutes.

Fig 3: Oxygen Sensor Monitor (Front And Rear O2S System) - Drive Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Preconditions

   The monitor will not run unless:

   • MIL is OFF
2. Drive Pattern
   1. Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions.
   2. Start the engine and allow it to idle for 2 minutes or more.
   3. Drive the vehicle at 25mph (40km/h) or more at least 50 seconds.
   4. Stop the vehicle and allow the engine to idle for 40 seconds or more.
   5. Perform steps (3) and (4) ten times.
   6. If readiness status dose not switch to complete, ensure preconditions are met, turn ignition off and then repeat steps (1) through (5).

Fig 4: Oxygen / AF Sensor Heater Monitor - Drive Pattern

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Preconditions

   The monitor will not run unless:

   • MIL is OFF
2. Drive Pattern
   1. Connect the OBD II scan tool to the DLC3 to check monitor status and preconditions.
   2. Start the engine and allow it to idle for 9 minutes.
   3. Drive the vehicle at 25mph (40km/h) or more at least 2 minutes.
   4. If readiness status dose not switch to "complete", ensure that the preconditions are met. If not, turn the ignition OFF and then repeat steps (2) and (3).