Monitors, Trips, Drive Cycles and Readiness Codes

1NZ-FXE ENGINE CONTROL SYSTEM: SFI SYSTEM: READINESS MONITOR DRIVE PATTERN

READINESS MONITOR DRIVE PATTERN

1. PURPOSE OF THE READINESS TESTS

- The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-related components, and report any detected abnormalities with Diagnostic Trouble Codes (DTCs).
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.
- Techstream's software must be version 9.0 or newer to view the readiness monitor status.
From the "Enhanced OBD II Menu", select "Monitor Status" to view the readiness monitor status.
- A generic OBD II scan tool can also be used to view the readiness monitor status.
- When the readiness monitor status reads "complete", the necessary conditions have been met for running performance tests for that readiness monitor.
HINT: Many state inspection and Maintenance (IM) programs require a vehicle's readiness monitor status to show "complete".

- The Readiness Monitor will be reset to "incomplete" if:
- The ECM has lost battery power or a fuse has blown.
- DTCs have been cleared.
- The conditions for running the Readiness Monitor have 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 the posted speed limits, traffic laws, and road condition 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 loads and speeds, such as driving up and down hills and/or sudden acceleration, hinder readiness monitor completion.
2. CATALYST MONITOR (A/F SENSOR TYPE)





(a) Preconditions
The monitor will not run unless:
- MIL is OFF.
- Engine Coolant Temperature (ECT) is 80°C (176°F) or greater.
- Intake Air Temperature (IAT) is -10°C (14°F) or greater.
NOTE: To complete the readiness test in cold ambient conditions (less than -10°C [14°F]), turn the power switch OFF and then turn it ON again. Perform the drive pattern a second time.

(b) Drive Pattern
(1) Connect Techstream or OBD II scan tool to the DLC3 to check readiness monitor status and preconditions.
(2) Put the engine in inspection mode Service Precautions.
(3) Start the engine and warm it up.
(4) Drive the vehicle at 70 to 88 km/h (44 to 55 mph) for approximately 4 minutes (the engine must be run during monitoring).
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 70 to 88 km/h (44 to 55 mph) for additional 4 minutes.
(5) Drive the vehicle allowing speed to fluctuate between 70 and 88 km/h (44 and 55 mph) for about 16 minutes.
NOTE: Drive with smooth throttle operation and avoid sudden closure of the throttle valve.
(6) Check the status of the readiness monitor on the scan tool display. If readiness monitor status did not switch to "complete", verify that the preconditions are met, turn the power switch OFF, and then repeat steps (4) and (5).
3. EVAP 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 8,000 ft (2,450 m).
- The vehicle is stationary.
- The engine coolant temperature is 4.4 to 35°C (40 to 95°F).
- The intake air temperature is 4.4 to 35°C (40 to 95°F).
- Vehicle was driven in an urban area (or on a freeway) for 10 minutes or more.

(b) Monitor Conditions
(1) Turn the power 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 Techstream to the DLC3.
(2) Turn the power switch ON (IG) and turn the tester ON.
(3) Check the Readiness Monitor status displayed on the tester.
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. OXYGEN / AIR FUEL RATIO SENSOR MONITOR (FRONT A/F SENSOR AND REAR O2S SYSTEM)





(a) Preconditions
The monitor will not run unless:
MIL is OFF
(b) Drive Pattern
(1) Connect Techstream or OBD II scan tool to the DLC3 to check monitor status and preconditions.
(2) Put the engine in inspection mode.
(3) Start the engine and allow it to idle for 2 minutes.
(4) Deactivate the inspection mode and drive the vehicle at 70 to 88 km/h (44 to 55 mph) or more for 5 to 10 minutes.
(5) Check the readiness monitor status. If the readiness monitor status did not switch to "complete", check the preconditions, turn the power switch OFF, and then repeat steps (1) to (4).
NOTE: Do not drive the vehicle without deactivating inspection mode, otherwise damaging the transaxle may result.

5. OXYGEN / A/F SENSOR HEATER MONITOR





(a) Preconditions
The monitor will not run unless:
MIL is OFF.
(b) Drive Pattern
(1) Connect Techstream or OBD II scan tool to the DLC3 to check monitor status and preconditions.
(2) Put the engine in inspection mode.
(3) Start the engine and allow it to idle for 500 seconds or more.
(4) Deactivate the inspection mode and drive the vehicle at 40 km/h (25 mph) or more for at least 2 minutes.
(5) Check the readiness monitor status. If the readiness monitor status did not change to "complete", check the preconditions, turn the power switch OFF, and repeat steps (2) and (3).
NOTE: Do not drive the vehicle without deactivating inspection mode, otherwise damaging the transaxle may result.