Monitors, Trips, Drive Cycles and Readiness Codes
3UZ-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: READINESS MONITOR DRIVE PATTERN
READINESS MONITOR DRIVE PATTERN
1. PURPOSE OF READINESS TESTS
- The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-related components, and indicate any detected abnormalities with Diagnostic Trouble Codes (DTC). Since various components need to be monitored during different driving conditions, the OBD II system is designed to run separate monitoring programs called Readiness Monitors.
- To view the status, enter the following menus: Powertrain / Engine and ECT / Monitor / Status2.
- When the Readiness Monitor status reads Complete, the necessary conditions have been met for running the performance tests for that Readiness Monitor.
- A generic OBD II scan tool can also be used to view the Readiness Monitor status.
HINT: Many state Inspection and Maintenance (I/M) programs require a vehicle's Readiness Monitor status to show Complete before beginning emissions tests.
- The Readiness Monitor will be reset to Incomplete if:
- The ECM has lost battery power or blown a fuse.
- DTCs have been cleared.
- The conditions for running the Readiness Monitor have not been met.
- If the readiness monitor status shows "Incomplete", follow the appropriate readiness monitor drive pattern to change the status to "Complete".
CAUTION:
Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns.
NOTE:
The following drive patterns are the fastest method of completing all the requirements necessary for making the readiness monitor status read "complete". If forced to momentarily stop a drive pattern due to traffic or other factors, the drive pattern can be resumed. Upon completion of the drive pattern, in most cases, the readiness monitor status will change to "complete". Sudden changes in vehicle load and speed, such as driving up and down hills and/or sudden acceleration, hinder readiness monitor completion.
2. CATALYST MONITOR
(a) Preconditions
- The monitor will not run unless:
- The MIL is OFF.
- Engine Coolant Temperature (ECT) is 75°C (167°F) or higher.
- Intake Air Temperature (IAT) is -10°C (14°F) or higher.
NOTE:
The readiness test can be completed in cold ambient temperature conditions (less than -10°C/14°F). Finish the drive pattern, turn the ignition switch OFF and then ON again, and repeat the drive pattern a second time.
(b) Drive Pattern
(1) Connect the Techstream to the DLC3 to check Readiness Monitor status and the preconditions (see above).
(2) Drive vehicle at 64 to 88 km/h (40 to 55 mph) for approximately 3 minutes.
NOTE:
Drive with smooth throttle operation and avoid sudden acceleration. If IAT was less than 10°C (50°F) when the engine was started, drive the vehicle at 64 to 88 km/h (40 to 55 mph) for an additional 3 minutes.
(3) Drive the vehicle at 56 to 72 km/h (35 to 45 mph) for approximately 7 minutes.
NOTE:
Drive with smooth throttle operation and avoid sudden closure of the throttle.
(4) Check the status of the readiness monitor on the scan tool display. If the readiness monitor status did not switch to complete, ensure that the preconditions are met, turn the ignition switch OFF, and then repeat the 2 previous steps.
3. EVAP SYSTEM MONITOR (KEY OFF TYPE)
(a) Preconditions
- The monitor will not run unless:
- The fuel tank is less than 90% full.
- The altitude is less than 2,450 m (8,000 ft.).
- The vehicle is stationary.
- The engine coolant temperature is between 4.4 and 35°C (40 and 95°F).
- The intake air temperature is between 4.4 and 35°C (40 and 95°F).
- Vehicle was driven in an urban area (or on a freeway) for 10 minutes or more.
(b) Monitor Conditions
(1) Turn the ignition switch OFF and wait for 6 hours.
HINT: Do not start the engine until checking Readiness Monitor status. If the engine is started, the step described above must be repeated.
(c) Monitor Status
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch ON.
(3) Turn the tester or scan tool ON.
(4) Check the Readiness Monitor status displayed on the tester or scan tool.
If the status does not switch to Complete, restart the engine, make sure that the preconditions have been met, and then perform the Monitor Conditions again.
4. HEATED OXYGEN SENSOR MONITOR
(a) Preconditions
- The monitor will not run unless:
- The MIL is OFF.
(b) Drive Pattern
(1) Connect the Techstream 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 40 km/h (25 mph) or more for at least 50 seconds.
(4) Stop the vehicle and allow the engine to idle for 40 seconds or more.
(5) Perform the 2 previous steps 10 times.
(6) If readiness status does not switch to "Complete", ensure that the preconditions are met, turn the ignition switch OFF and then repeat the 5 previous steps.
5. HEATED OXYGEN SENSOR HEATER MONITOR
(a) Preconditions
- The monitor will not run unless:
- The MIL is OFF.
(b) Drive Pattern
(1) Connect the Techstream to the DLC3 to check monitor status and preconditions.
(2) Start the engine and allow it to idle for 10 minutes or more.
(3) Drive the vehicle at 40 km/h (25 mph) or more for at least 2 minutes.
(4) Check the readiness monitor status. If the readiness monitor status did not change to "complete", double-check the preconditions, turn the ignition switch OFF, and repeat the 2 previous steps.