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Readiness Monitor Drive Patterns (EG003-02)

Publication date: 2002-03-29
Reference number: EG003-02

READINESS MONITOR DRIVE PATTERNS

READINESS MONITOR DRIVE PATTERNS

TECHNICAL SERVICE BULLETIN

Reference Number(s): EG003-02, Date of Issue:  March 29, 2002
TOYOTA: All 1996-2002 Models
SECTION: Engine
COPYRIGHT: © 2018 Toyota, USA License Agreement TMS1002
Superceded Bulletin(s): EG003-02, Date of Issue:  February 8, 2002
NOTE: TSB Revision Notice: This TSB supersedes TSB EG003-02, dated February 8, 2002.

INTRODUCTION

The On-Board Diagnostic (OBDII) 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 OBDII system is designed to run 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 Toyota Diagnostic Tester with version 9.0 software (or newer), or a generic OBDII Scantool. To view the Readiness Monitor status using the Toyota Diagnostic Tester, select "Monitor Status" from the Enhanced OBDII 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:

In the event that any Readiness Monitor shows "incomplete," follow the appropriate Readiness Monitor Drive Pattern to change the readiness status to "complete." Refer to READINESS MONITOR DRIVE PATTERN APPLICATION TABLES  to determine which drive pattern should be followed.

CONTENTS

READINESS MONITOR DRIVE PATTERN APPLICATION TABLES  (See Fig 2 thru 8 .

Readiness Monitor Drive Patterns:

APPLICABLE VEHICLES

WARRANTY INFORMATION

WARRANTY INFORMATION

OP Code Description Time OPN T1 T2
N/A Not Applicable to Warranty --- --- --- ---

TERMS AND DEFINITIONS

TERMS AND DEFINITIONS

J1930 Term J1930 Definition Toyota/Lexus Diagnostic Tester Parameter
IAT Intake Air Temperature Intake Air
ECT Engine Coolant Temperature Coolant Temp

REQUIRED TOOLS AND MATERIAL

REQUIRED TOOLS AND MATERIAL

Tools and Material Part Number Quantity
Toyota Diagnostic Tester Kit 01001271 1
12 Megabyte Diagnostic Tester Program Card with version 9.0a Software (or later) 01002593-005 1
NOTE: A generic OBDII Scantool can be used in place of the Toyota Diagnostic Tester.
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).

UNDERHOOD EMISSION CONTROL INFORMATION LABEL

Fig 1: Sample Emission Control Information Label
G00204882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

READINESS MONITOR DRIVE PATTERN APPLICATION TABLES

Fig 2: 1996 Model Year
G00204883Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 3: 1997 Model Year
G00204884Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 4: 1998 Model Year
G00204885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 5: 1999 Model Year
G00204886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 6: 2000 Model Year
G00204887Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 7: 2001 Model Year
G00204888Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 8: 2002 Model Year
G00204889Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

READINESS MONITOR DRIVE PATTERNS: EGR MONITORS

DRIVE PATTERN NO. 1: EGR MONITOR (ALL EXCEPT 1FZ-FE ENGINE)

Fig 9: Procedure Chart: EGR Monitor (All Except 1FZ-FE Engine)
G00204890Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Altitude is 7800 feet (2400 m) or less.
  • IAT (Intake Air) is 14°F (-10°C) or greater.

Drive Pattern Procedure

Connect the OBDII Scantool to the DLC3 connector to check monitor status and preconditions.

  1. If IAT (Intake Air) is less than 50°F (10°C) when starting the engine, idle the engine for approximately 10 minutes. See Fig 9.
  2. Drive the vehicle at 43-56 mph (70-90 km/h) for a period of 3-5 minutes.
    NOTE:
    • Do not allow the Throttle Position (TP) to exceed 30%.
    • Drive with smooth throttle operation and avoid sudden acceleration.
  3. Stop the vehicle and let the engine idle for 3-5 minutes.
  4. Repeat steps "b" and "c" once.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "b" through "d."

NOTE:

The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).

  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 2: EGR MONITOR (FOR 1FZ-FE ENGINE)

Fig 10: Procedure Chart: EGR Monitor (for 1FZ-FE Engine)
G00204891Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Altitude is 7800 feet (2400 m) or less.
  • IAT (Intake Air) is 14°F (-10°C) or greater.
  • ECT (Coolant Temp) is less than 104°F (40°C).

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.

  1. Start the engine and as soon as safely possible begin driving the vehicle at 43-56 mph (70-90 km/h) for a period of 3-5 minutes. See Fig 10.
    NOTE:
    • Do not allow the Throttle Position (TP) to exceed 30%.
    • Drive with smooth throttle operation and avoid sudden acceleration.
  2. Stop the vehicle and let the engine idle for 3-5 minutes.
  3. Repeat steps "a" and "b" once.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" through "c."

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

READINESS MONITOR DRIVE PATTERNS: CATALYST MONITORS

DRIVE PATTERN NO. 3: CATALYST MONITOR (O2S TYPE)

Fig 11: Procedure Chart: Catalyst Monitor (O2S Type)
G00204892Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

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

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.

Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted during step "a" based upon IAT (Intake Air) value at startup.

  1. Drive the vehicle at 40-55 mph (64-88 km/h) for the time described below:
    • If IAT (Intake Air) was less than 50°F (10°C) when the engine was started, drive for 7 minutes.
    • If IAT (Intake Air) was greater than 50°F (10°C) when the engine was started, drive for 3 minutes.
  2. Drive the vehicle at 35-45 mph (56-72 km/h) for approximately 7 minutes. See Fig 11.
    NOTE:
    • Drive with smooth throttle operation.
    • Avoid sudden acceleration.
    • Avoid sudden deceleration as much as possible with the throttle fully closed.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" and "b."

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 4: CATALYST MONITOR (AF SENSOR TYPE)

Fig 12: Procedure Chart: Catalyst Monitor (AF Sensor Type)
G00204893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

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

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions. Note the IAT (Intake Air) value during engine startup. The driving time must be adjusted during step "a" based upon IAT (Intake Air) value at startup.

  1. Drive the vehicle at 40-55 mph (64-88 km/h) for the time described below:
    • If IAT (Intake Air) was less than 50°F (10°C) when the engine was started, drive for 7 minutes.
    • If IAT (Intake Air) was greater than 50°F (10°C) when the engine was started, drive for 3 minutes.
  2. Drive the vehicle allowing speed to fluctuate between 35-45 mph (56 -72 km/h) for about 16 minutes. See Fig 12.
    NOTE:
    • Drive with smooth throttle operation.
    • Avoid sudden acceleration.
    • Avoid sudden deceleration as much as possible with the throttle fully closed.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" and "b."

NOTE:

The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).

  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

READINESS MONITOR DRIVE PATTERNS: EVAP MONITORS

DRIVE PATTERN NO. 5: EVAP MONITOR (INTERNAL PRESSURE MONITOR/NON-INTRUSIVE TYPE)

Fig 13: Procedure Chart: EVAP Monitor (Internal Pressure Monitor/Non-intrusive Type)
G00204894Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Cold Soak Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Fuel level is between 1/2 to 3/4 full (for faster completion).
  • Altitude is 7800 feet (2400 m) or less.

IMPORTANT: A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pressure Readiness Monitor.
Cold Soak Procedure
  • 1a: Start the engine and allow ECT (Coolant Temp) to reach 176°F (80°C) or greater. (This can be done by letting the engine idle or by driving the vehicle.) See Fig 13.
  • 1b: Let the vehicle cold soak for 8 hours or until the difference between IAT (Intake Air) and ECT (Coolant Temp) is less than 13°F (7°C).

Example 1

  • ECT (Coolant Temp) = 75°F (24°C).
  • IAT (Intake Air) = 60°F (16°C).
  • Difference between ECT (Coolant Temp) and IAT (Intake Air) is 15°F (8°C). The monitor will not run because the difference between ECT (Coolant Temp) and IAT (Intake Air) is greater than 13°F (7°C).

Example 2

  • ECT (Coolant Temp) = 70°F (21°C).
  • IAT (Intake Air) = 68°F (20°C).
  • Difference between ECT (Coolant Temp) and IAT (Intake Air) is 2°F (1°C).
    • The monitor will run because the difference between ECT (Coolant Temp) and IAT (Intake Air) is less than 13°F (7°C).
Drive Pattern Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Fuel level is between 1/2 to 3/4 full (for faster completion)
  • Altitude is 7800 feet (2400 m) or less.
  • ECT (Coolant Temp) is between 40°F and 95°F (4.4°C-35°C).
  • IAT (Intake Air) is between 40°F and 95°F (4.4°C-35°C).
  • Cold Soak Procedure has been completed.

NOTE: Before starting the engine, the difference between ECT (Coolant Temp) and IAT (Intake Air) must be less than 13°F (7°C). (Refer to Examples 1 and 2 under Cold Soak Procedure )
Drive Pattern Procedure
  • Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
  • Release the pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
  • Start the engine and begin driving as directed.
NOTE:
  • Do not turn the ignition off until the drive pattern is complete.
  • Drive on smooth roads to reduce excessive fuel sloshing.
  1. Start the engine and as soon as safely possible begin driving at approximately 45 mph (72km/h) for 5 minutes. See Fig 13.
  2. Drive the vehicle at approximately 25 mph (40 km/h) for 15 minutes and include a minimum of two stops for approximately 30 seconds.

The monitor should complete within approximately 20 minutes. If it does not, ensure preconditions are met and repeat the drive pattern process beginning with the Cold Soak Procedure.

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 6: EVAP MONITOR (VACUUM PRESSURE MONITOR/INTRUSIVE TYPE)

Fig 14: Procedure Chart: EVAP Monitor (Vacuum Pressure Monitor/Intrusive Type)
G00204895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Cold Soak Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Fuel level is between 1/2 to 3/4 full (for faster completion).
  • Altitude is 7800 feet (2400 m) or less.

Cold Soak Procedure
  • a: Let the vehicle cold soak for 8 hours or until the difference between IAT (Intake Air) and ECT (Coolant Temp) is less than 13°F (7°C).

Example 1

  • ECT (Coolant Temp) = 75°F (24°C).
  • IAT (Intake Air) = 60°F (16°C).
  • Difference between ECT (Coolant Temp) and IAT (Intake Air) is 15°F (8°C).
    • The monitor will not run because the difference between ECT (Coolant Temp) and IAT (Intake Air) is greater than 13°F (7°C).

Example 2

  • ECT (Coolant Temp) = 70°F (21°C).
  • IAT (Intake Air) = 68°F (20°C).
  • Difference between ECT (Coolant Temp) and IAT (Intake Air) is 2°F (1°C).
    • The monitor will run because the difference between ECT (Coolant Temp) and IAT (Intake Air) is less than 13°F (7°C).
Drive Pattern Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Fuel level is between 1/2 to 3/4 full (for faster completion).
  • Altitude is 7800 feet (2400 m) or less.
  • ECT (Coolant Temp) is between 40°F and 95°F (4.4°C-35°C).
  • IAT (Intake Air) is between 40°F and 95°F (4.4°C-35°C).
  • Cold Soak Procedure has been completed.
    NOTE: For 2002 MY and later 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/2400 m) if the complete drive pattern (including Cold Soak) is repeated a second time after cycling the ignition OFF.

NOTE: Before starting the engine, the difference between ECT (Coolant Temp) and IAT (Intake Air) must be less than 13°F (7°C). (Refer to Examples 1 and 2 under Cold Soak Procedure .)
Drive Pattern Procedure
  • Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
  • Release the pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
    1. Start the engine and allow it to idle until ECT (Coolant Temp) is 167°F (75°C) or greater. See Fig 14.
    2. Race the engine at 3,000 rpm for approximately 10 seconds.
    3. Allow the engine to idle with the A/C ON (to create a slight load) for 15-50 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 vehicle to idle in drive for 15-50 minutes.
NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 7: EVAP MONITOR (WITHOUT LEAK DETECTION)

Fig 15: Procedure Chart: EVAP Monitor (Without Leak Detection)
G00204896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Altitude is 7800 feet (2400 m) or less.
  • ECT (Coolant Temp) is 181°F (83°C) or greater.
  • IAT (Intake Air) is 41°F (5°C) or greater.

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.

  1. Drive the vehicle at 43-56 mph (70-90 km/h) for a period of 3-5 minutes. See Fig 15.
    NOTE:
    • Do not allow the Throttle Position (TP) to exceed 30%.
    • Drive with smooth throttle operation and avoid sudden acceleration.
  2. Stop the vehicle and let the engine idle for 3-5 minutes.
  3. Repeat steps "a" and "b" once.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" through "c."

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 8: EVAP MONITOR (FOR PRIUS)

Fig 16: Procedure Chart: EVAP Monitor (For Prius)
G00204897Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Cold Soak Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Altitude is 7800 feet (2400 m) or less.

IMPORTANT: A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pressure Readiness Monitor.
Cold Soak Procedure
  • 1a: Let the vehicle cold soak for 8 hours or until the difference between IAT (Intake Air) and ECT (Coolant Temp) is less than 13°F (7°C).

Example 1

  • ECT (Coolant Temp) = 75°F (24°C).
  • IAT (Intake Air) = 60°F (16°C).
  • Difference between ECT (Coolant Temp) and IAT (Intake Air) is 15°F (8°C).
    • The monitor will not run because the difference between ECT (Coolant Temp) and IAT (Intake Air) is greater than 13°F (7°C).

Example 2

  • ECT (Coolant Temp) = 70°F (21°C).
  • IAT (Intake Air) = 68°F (20°C).
  • Difference between ECT (Coolant Temp) and IAT (Intake Air) is 2°F (1°C).
    • The monitor will run because the difference between ECT (Coolant Temp) and IAT (Intake Air) is less than 13°F (7°C).
Drive Pattern Preconditions

The monitor will not run unless:

  • MIL is OFF.
  • Altitude is 7800 feet (2400 m) or less.
  • ECT (Coolant Temp) is between 40°F and 95°F (4.4°C-35°C).
  • IAT (Intake Air) is between 40°F and 95°F (4.4°C-35°C).
  • Cold Soak Procedure has been completed.

NOTE: Before starting the engine, the difference between ECT (Coolant Temp) and IAT (Intake Air) must be less than 13°F (7°C). (Refer to Examples 1 and 2 under Cold Soak Procedure .)
Drive Pattern Procedure
  • Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
  • Release the pressure in the fuel tank by removing and then reinstalling the fuel tank cap.
  • Start the engine and as soon as safely possible begin driving as directed.
    • 2a: Drive the vehicle at 50-65 mph (80-104 km/h) for about 15 minutes. See Fig 16.
NOTE:
  • Do not turn the ignition off until the drive pattern is complete.
  • Drive on smooth roads to reduce excessive fuel sloshing.

If vehicle speed drops under 45 mph (72 km/h) repeat step "2a."

READINESS MONITOR DRIVE PATTERNS: OXYGEN MONITORS

DRIVE PATTERN NO. 9: OXYGEN SENSOR MONITOR (FRONT AND REAR O2S SYSTEM)

Fig 17: Procedure Chart: Oxygen Sensor Monitor (Front & Rear O2S System)
G00204898Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

  • MIL is OFF.

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.

  1. Start the engine and allow it to idle for 2 minutes or more. See Fig 17.
  2. Drive the vehicle at 25 mph (40 km/h) or more for at least 50 seconds. Be sure engine speed remains above 900 rpm.
  3. Stop the vehicle and allow the engine to idle for 40 seconds or more.
  4. Perform steps "b" and "c" ten times.

If readiness status does not switch to "complete " ensure preconditions are met, turn the ignition OFF, then repeat steps "a" through "d."

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 10: OXYGEN/AIR FUEL RATIO SENSOR MONITOR

Fig 18: Procedure Chart: Oxygen/Air Fuel Ratio Sensor Monitor (Front AF Sensor & Rear O2S System)
G00204899Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

  • MIL is OFF.

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.

  1. Start the engine and allow it to idle for 2 minutes or more. See Fig 18.
  2. Drive the vehicle at 40-70 mph (64-112 km/h) or more for at least 3 minutes. Be sure to maintain engine speed between 900 and 3,200 rpm.
  3. Stop the vehicle and allow the engine to idle for 10 seconds or more.
  4. Drive the vehicle at 25 mph (40 km/h) for at least 40 seconds or more. Be sure to maintain engine speed above 900 rpm.
  5. Stop the vehicle and allow the engine to idle for 10 seconds or more.
  6. Perform steps "d" and "e" ten times.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition switch OFF, then repeat steps "a" through "f."

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.

DRIVE PATTERN NO. 11: OXYGEN/AF SENSOR HEATER MONITOR

Fig 19: Procedure Chart: Oxygen/AF Sensor Heater Monitor
G00204900Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Preconditions

The monitor will not run unless:

  • MIL is OFF.

Drive Pattern Procedure

Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.

  1. Start the engine and allow it to idle for 9 minutes. See Fig 19.
  2. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes.

If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" and "b."

NOTE: The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
  • Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
  • Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
  • Once a second trip is completed, a current DTC will be stored.
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