Canada - Emissions - OBD II Readiness Monitor Drive Patterns
Bulletin
1082
Issue Date
2002-03-27
Reference
EM-02-003
Model
All Models
Year Range
1996 ~ 2002
Market
Canada
Component
EM
Subject:
READINESS MONITOR DRIVE PATTERNS
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.
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:
- ECU 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."
Refer to the Readiness Monitor Drive Pattern Application Table to determine which drive pattern should be followed.
CONTENTS:
APPLICABLE VEHICLES: ALL 1996 - 2002 model year Toyota vehicles.
REQUIRED TOOLS & MATERIAL:
NOTE:
A generic OBDll 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).
READINESS MONITOR DRIVE PATTERN APPLICATION TABLES:
READINESS MONITOR DRIVE PATTERNS: EGR MONITORS
Drive Pattern No. 1: EGR Monitor (All Except 1FZ-FE Engine)
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.
a) If IAT (Intake Air) is less than 50°F (10°C) when starting the engine, idle the engine for approximately 10 minutes.
b) 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.
c) Stop the vehicle and let the engine idle for 3 - 5 minutes.
d) 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 (All Except 1FZ-FE Engine)
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 the DLC3 to check monitor status and preconditions.
a) 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.
NOTE:
- Do not allow the Throttle Position (TP) to exceed 30%.
- Drive with smooth throttle operation and avoid sudden acceleration.
b) Stop the vehicle and let the engine idle for 3 - 5 minutes.
c) 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)
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.*
* 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 the 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.
a) 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.
b) Drive the vehicle at 35 - 45 mph (56 - 72 km/h) for approximately 7 minutes.
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" through "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)
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.*
* 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 the 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.
a) 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.
b) Drive the vehicle allowing speed to fluctuate between 35 - 45 mph (56 - 72 km/h) for about 16 minutes.
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" through "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)
Cold Soak Preconditions
The monitor will not run unless:
- MIL is OFF.
- Fuel level is between 1/2 to 3/4 full.
- 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.)
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.
- 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.)
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.
2a. Start the engine and as soon as safely possible begin driving at approximately 45 mph (72km/h) for 5 minutes. (See illustration.)
2b. Drive the vehicle at approximately 25 mph (40 km/h) for 15 minutes and include a minimum of two stops for approximately 30 seconds. (See illustration.)
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)
Cold Soak Preconditions
The monitor will not run unless:
- MIL is OFF.
- Fuel level is between 1/2 to 3/4 full.
- Altitude is 7800 feet (2400 m) or less.
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.
- Fuel level is between 1/2 to 3/4 full.
- 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.
* 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.)
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.
2a. Start the engine and allow it to idle until ECT (Coolant Temp) is 167°F (75°C) or greater. (See illustration.)
2b. Race the engine at 3,000 rpm for approximately 10 seconds. (See illustration.)
2c. Allow the engine to idle with the A/C ON (to create a slight load) for 15-50 minutes. (See illustration.)
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)
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 the DLC3 to check monitor status and preconditions.
a) 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.
b) Stop the vehicle and let the engine idle for 3 - 5 minutes.
c) 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)
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.)
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 illustration.)
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)
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.
a) Start the engine and allow it to idle for 2 minutes or more.
b) Drive the vehicle at 25 mph (40 km/h) or more for at least 50 seconds. Be sure engine speed remains above 900 rpm.
c) Stop the vehicle and allow the engine to idle for 40 seconds or more.
d) 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 (Front AF Sensor and Rear O2S System)
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.
a) Start the engine and allow it to idle for 2 minutes or more.
b) Drive the vehicle at 40 - 70 mph (64 - 112 km/h) or more for at least 50 seconds. Be sure to maintain engine speed between 900 and 3,200 rpm.
c) Stop the vehicle and allow the engine to idle for 10 seconds or more.
d) 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.
e) Stop the vehicle and allow the engine to idle for 10 seconds or more.
f) Perform steps "d" and "e" ten times.
If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition 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
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.
a) Start the engine and allow it to idle for 9 minutes.
b) 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" through "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.
NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.