Monitors, Trips, Drive Cycles and Readiness Codes
READINESS MONITOR DRIVE PATTERN1. 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 DTC (Diagnostic Trouble Codes). 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.
- The intelligent tester's software must be version 9.0 or newer to view the Readiness Monitor Status. To view the status, enter the following menus: DIAGNOSIS / ENHANCED OBD II / MONITOR INFO / MONITOR STATUS.
- When the Readiness Monitor status reads COMPL (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 COMPL before beginning emissions tests.
The Readiness Monitor will be reset to INCMPL (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 INCMPL, follow the appropriate Readiness Monitor Drive Pattern to change the status to COMPL.
CAUTION: Strictly observe posted speed limits, traffic laws, and road conditions when performing these drive patterns.
NOTE: The drive patterns represent the fastest method of satisfying all conditions necessary to achieve complete status for each specific Readiness Monitor. If a drive pattern is interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed. In most cases, the Readiness Monitor will still achieve complete status upon completion of the drive pattern,
To ensure completion of the Readiness Monitors, avoid sudden changes in vehicle load and speed (driving up and down hills and/or sudden acceleration).
2. CATALYST MONITOR (AIR-FLOW RATIO (A/F) SENSOR TYPE)
a. Preconditions
The monitor will not run unless:
- The MIL is OFF
- Engine Coolant Temperature (ECT) is 75 degrees C (167 degrees F) or higher.
- Intake Air Temperature (IAT) is -10 degrees C (14 degrees F) or higher.
b. Drive Pattern
Step 1
Connect the intelligent tester to the DLC3 to check Readiness Monitor status and preconditions (refer to step (a)).
Step 2
Drive the vehicle at 64 to 88 km/h (40 to 55 mph) for approximately 4 minutes.
NOTE: Drive with smooth throttle operation and avoid sudden acceleration. If IAT was less than 10 degrees C (50 degrees F) when the engine was started, drive the vehicle at 64 to 88 km/h (40 to 55 mph) for an additional 4 minutes.
Step 3
Drive the vehicle allowing speed to fluctuate between 64 to 80 km/h (40 to 50 mph) for approximately 7 minutes.
NOTE: Drive with smooth throttle operation and avoid sudden closure of the throttle.
Step 4
Check the status of the readiness monitor on the scan tool display. If the readiness monitor status did not switch to complete, ensure preconditions are met, turn the engine switch off, and then repeat steps 2 and 3.
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 8,000 ft (2,450 m).
- The vehicle is at stationary.
- The engine coolant temperature is between 4.4 degrees C and 35 degrees C (40 degrees F and 95 degrees F).
- The intake air temperature is between 4.4 degrees C and 35 degrees C (40 degrees F and 95 degrees F).
- Vehicle was driven in the city area (or on freeway) for 10 minutes or more.
b. Monitor Conditions
1. Turn the engine switch off and wait for 9.5 hours.
HINT: Do not start the engine until checking Readiness Monitor status. If the engine is started, the step described above most be repeated.
c. Monitor Status
1. Connect an intelligent tester to the DLC3.
2. Turn the engine switch on (IG).
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 COMPL (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 (FRONT A/F AND REAR HO2 SENSOR TYPE)
a. Preconditions
The monitor will not run unless: The MIL is OFF
b. Drive Pattern
Step 1
Connect the intelligent tester to the DLC3 to check monitor status and preconditions (refer to step (a)).
Step 2
Start the engine and allow it to idle for 2 minutes or more.
Step 3
Drive the vehicle at 64 to 112 km/h (40 to 70 mph) for at least 150 seconds.
Step 4
Stop the vehicle and allow the engine to idle for 10 seconds or more.
Step 5
Drive the vehicle at 40 to 64 km/h (25 to 40 mph) for at least 40 seconds.
Step 6
Stop the vehicle and allow the engine to idle for 10 seconds or more.
Step 7
Perform steps 5 and 6 ten times.
Step 8
Check the readiness monitor status. If the readiness monitor status did not change to COMPL (complete), check the preconditions, turn the engine switch off, and repeat steps 1 to 6.
5. AIR-FUEL RATIO (A/F) AND HEATED OXYGEN (HO2) SENSOR HEATER MONITORS (FRONT A/F AND REAR HO2 SENSOR TYPE)
a. Preconditions
The monitor will not run unless: MIL is OFF
b. Drive Pattern
Step 1
Connect the intelligent tester to the DLC3.
Step 2
Turn the engine switch on (IG).
Step 3
Turn the tester or scan tool ON. Step 4 Clear DTCs (where set).
Step 5
Start the engine.
Step 6
Allow the engine to idle for 10 minutes or more.
Step 7
Drive the vehicle at 40 km/h (25 mph) or more for at least 2 minutes.
c. Monitor Status
1. Check the Readiness Monitor status displayed on the tester or scan tool.
If the status does not switch to COMPL (complete), make sure that the preconditions have been met, and repeat steps through 5. to (7) described in the Drive Pattern above.