Monitors, Trips, Drive Cycles and Readiness Codes
2UZ-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 (ACTIVE AIR FUEL RATIO CONTROL TYPE)
(a) Preconditions
- The monitor will not run unless:
- The MIL is OFF
(b) Drive Pattern
(1) Connect the Techstream.
(2) Turn the ignition switch ON.
(3) Turn the tester ON.
(4) Clear DTC (if set) DTC Check / Clear.
(5) Start the engine and warm it up [A].
(6) Drive vehicle at between 40 to 70 mph (64 and 113 km/h) for at least 10 minutes [B].
NOTE: This test will not be completed if the vehicle is driven under absolutely constant speed, such as with cruise control activated.
(c) Monitor Status
(1) Check the Readiness Monitor status displayed on the tester.
(2) If the status does not switch to Complete, extend the driving time.
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 8000 ft (2450 m).
- 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 free-way) 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. AIR-FUEL RATIO (A/F) AND HEATED OXYGEN (HO2) SENSOR MONITORS (ACTIVE AIR-FUEL RATIO CONTROL TYPE)
(a) Preconditions
- The monitor will not run unless:
- 2 minutes or more have elapsed since the engine was started.
- The Engine Coolant Temperature (ECT) is 75°C (167°F) or more.
- Cumulative driving time at a vehicle speed of 48 km/h (30 mph) or more exceeds 6 minutes.
- Air-fuel ratio feedback control is performed.
(b) Drive Pattern for front A/F sensor and HO2 sensor
(1) Connect the Techstream to the DLC3.
(2) Turn the ignition switch ON.
(3) Turn the tester ON.
(4) Clear DTCs DTC Check / Clear.
(5) Start the engine, and warm it up until the ECT reaches 75°C (167°F) or higher.
(6) Drive the vehicle at between 60 km/h (40 mph) and 120 km/h (75 mph) for at least 10 minutes.
(7) Change the transmission to 2nd gear.
(8) Accelerate the vehicle to 60 km/h (40 mph) or more by depressing the accelerator pedal for at least 10 seconds.
(9) Soon after performing step (8) above, release the accelerator pedal for at least 5 seconds without depressing the brake pedal in order to execute fuel-cut control.
(10) Allow the vehicle to decelerate until the vehicle speed declines to less than 10 km/h (6 mph).
(11) Repeat steps from (8) through (10) above at least 3 times in one driving cycle.
(c) Monitor Status
(1) Check the Readiness Monitor status displayed on the tester.
(2) If the status does not switch to Complete, make sure that the preconditions have been met, and then perform steps from (5) through (11) in the Drive Pattern above.
5. AIR FUEL RATIO (A/F) AND HEATED OXYGEN (HO2) SENSOR HEATER MONITOR (FRONT A/F AND REAR HO2 SENSOR TYPE)
(a) Preconditions
- The monitor will not run unless:
- The MIL is OFF
(b) Drive Pattern
1. Connect the Techstream to the DLC3 [A].
2. Turn the ignition switch ON [B].
3. Turn the tester ON [C].
4. Clear DTCs (if set) DTC Check / Clear [D].
5. Start the engine [E].
6. Start the engine and allow it to idle for 500 seconds or more [F].
7. Drive the vehicle at 25 mph (40 km/h) or more for at least 2 minutes [G].
(c) Monitor Status
- (1) Check the Readiness Monitor status displayed on the tester.
- If the status does not switch to Complete, make sure that the preconditions of the readiness monitor on the scan tool display. If readiness status did not switch to complete, ensure the preconditions are met, turn the ignition switch OFF and then repeat steps [E] and [G].