Toyota/Lexus use a series of diferent drive traces for each system monitor.

It's possible that more tan one monitor may run while doing a particular drive trace, but here's the official procedure from Toyota/Lexus:

EGR MONITOR DRIVE CYCLE

All models 1996-2002

Pre-Conditioning Requirements:

• MIL must be off.
  
• Altitude is below 7801 feet (2400 m).
  
• IAT (Intake Air Temperature) must be above 13E F (-10E C).
  
• 1996-2000 Land Cruiser / LX 450 ECT must be below 104E F (40E C).

Driving Procedure

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. If IAT is less than 50E F (10EC) at engine start-up, idle engine for 10 minutes.
   
   Notes: Do not exceed 30% TPS. Maintain smooth throttle inputs, avoiding sudden accelerations.
   Exception: 1996-2000 Land Cruiser & LX 450- Begin driving immediately.
   
3. Drive the vehicle at a steady speed between 43 & 56 mph (70-90 km/h) for three to five minutes.
   
4. Stop the vehicle and idle the engine for 3-5 minutes.
   
5. Repeat steps 1-3 once.

Notes: Readiness may not switch to complete if a pending code was set during the drive trace. Toyotas do report pending codes (using an enhanced scan tool). Pending codes are not considered a failure, and typically must be duplicated in order to set a DTC & MIL.

AIR/FUEL SENSOR HEATER MONITOR DRIVE CYCLE

All models 1996-2002

Pre-Conditioning Requirements:

• MIL must be off.

Driving Procedure:

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Start engine and allow it to idle for 9 minutes.
   
3. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes.

CATALYST (NON-A/F SENSOR) MONITOR DRIVE CYCLE

Certain Models 1996-2002

Pre-Conditioning Requirements:

• MIL must be off.
  
• ECT (Engine Coolant Temperature) must be 176E F (80E C) or more.
• IAT (Intake Air Temperature) must be 14E F (-10E C) or more.
  
  (2002 MY vehicles will run monitor at temperatures below 14E F by cycling key to OFF and repeating drive trace).

Driving Procedure:

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Note the IAT data for use in step 3.
   
3. Drive the vehicle at a steady speed between 40-55 mph (64-88 km/h) or more for 7 minutes if IAT was below 50E F (10E C) at start-up, or 3 minutes if IAT was above 50E F (10E F) at start-up.
   
4. Drive the vehicle at 35-45 mph (56-72 km/h) for 7 minutes.

NOTES: Maintain smooth throttle inputs, avoiding sudden accelerations. Avoid sudden deceleration with closed throttle as much as possible.

CATALYST (A/F SENSOR) MONITOR DRIVE CYCLE

Certain Models 1998-2002

Pre-Conditioning Requirements:

• MIL must be off.
  
• ECT (Engine Coolant Temperature) must be 176E F (80E C) or more.
• IAT (Intake Air Temperature) must be 14E F (-10E C) or more.
  
  (2002 MY vehicles will run monitor at temperatures below 14E F by cycling key to OFF and repeating drive trace).

Driving Procedure:

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Note the IAT data for use in step 3.
   
3. Drive the vehicle at a steady speed between 40-55 mph (64-88 km/h) or more for 7 minutes if IAT was below 50E F (10E C) at start-up, or 3 minutes if IAT was above 50E F (10E F) at start-up.
   
4. Drive the vehicle allowing speed to fluctuate between 35-45 mph (56-72 km/h) for 16 minutes.

Notes: Maintain smooth throttle inputs, avoiding sudden accelerations. Avoid sudden deceleration with closed throttle as much as possible.

EVAPORATIVE (VACUUM PRESSURE TYPE) MONITOR DRIVE CYCLE

Certain Models 2000-2002

Pre-Conditioning Requirements:

• MIL must be off.
  
• Fuel level is between 2 and 3/4 full.
  
• (Preferred values- monitor may still run with tank fill between 15% and 85%).
• Altitude is below 7801 feet (2400 m).
• ECT & IAT is between 40 & 95E F (4.5-35E C).
• Cold Soak Procedure is complete (see below).
  
  (2002 MY vehicles will run monitor at temperatures below 14E F by cycling key to OFF and repeating drive trace).

IMPORTANT:

A cold soak must be performed prior to conducting the drive pattern in order to complete the Internal Pressure Readiness Monitor (see below).

Cold Soak Procedure:

1. Let the vehicle sit 8 hours, or until the difference between IATand ECT is less than 13E F (7E C).

Driving Procedure:

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Release pressure in the fuel tank by removing and re-installing fuel cap.
   
3. Start the engine and allow it to idle until ECT is 167E F (75E C) or more.
   
4. Raise the engine speed to 3,000 RPM for ten (10) seconds.
   
5. Idle engine with the A/C on (for additional load) for 15-50 minutes.

(If no A/C, set parking brake and chock wheels. Once immobilized, idle vehicle in drive).

EVAPORATIVE (WITH NO LEAK DETECTION) MONITOR DRIVE CYCLE

Certain Models 1996-2000

Pre-Conditioning Requirements:

• MIL must be off.
  
• Altitude is below 7801 feet (2400 m). ECT is 181E F (83E C) or more.
  
• IAT is 41E F (5E C) or more.

Driving Procedure: (this is the same driving trace used by the EGR monitor).

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Drive the vehicle at a steady speed between 43 & 56 mph (70-90 km/h) for three to five minutes.
   
   Notes: Do not exceed 30% TPS. Maintain smooth throttle inputs, avoiding sudden accelerations.
   
3. Stop the vehicle and idle the engine for 3-5 minutes.
   
4. Repeat steps 1-3 once.

OXYGEN SENSOR MONITOR DRIVE CYCLE

Certain models 1996-2002

Pre-Conditioning Requirements:

• MIL must be off.

Driving Procedure:

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Drive the vehicle at a steady speed at or above 25 mph (40 km/h) for at least 50 seconds. Maintain engine speed above 900 rpm.
   
3. Stop the vehicle and allow the engine to idle for 40 seconds or more.
   
4. Repeat steps 2 & 3 nine (9) more times.

AIR-FUEL RATIO (OXYGEN) SENSOR MONITOR DRIVE CYCLE

Certain models 1998-2002

Pre-Conditioning Requirements:

• MIL must be off.

Driving Procedure:

1. Connect Scan tool in order to observe data stream and monitor status.
   
2. Start the engine and allow it to idle 2 minutes.
   
3. Drive the vehicle at a steady speed between 40-70 mph (64-112 km/h) or more for 3 minutes. Maintain engine speed between 900 & 3,200 rpm.
   
4. Stop the vehicle and allow it to idle for ten (10) seconds or more.
   
5. Drive the vehicle at a steady speed above 25 mph (40 km/h) or more for at least 40 seconds. Maintain engine speed above 900 rpm.
   
6. Stop the vehicle and allow it to idle for ten (10) seconds or more.
   
7. Repeat steps 5 & 6 nine (9) more times.

Source: Toyota

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