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DI-27
DIAGNOSTICS - ENGINE (1GR-FE)
DIDUH-01
READINESS MONITOR DRIVE PATTERN
1. PURPOSE OF THE READINESS TESTS
S The On-Board Diagnostic (OBD II) system is designed to monitor the performance of emission-re-
lated 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
OBD II system is designed to run separate monitoring programs called Readiness Monitors. Many
state Inspection and Maintenance (I/M) programs require that vehicles complete their Readiness Mon-
itors prior to beginning an emission test.
S The current status of the Readiness Monitors can be seen by using the hand-held tester with version
9.0 software (or newer), or a generic OBD II Scan tool.
S To view the Readiness Monitor status using the hand-held tester, select "Monitor Status" from the En-
hanced OBD II Menu.
S A status of "complete" indicates that the necessary conditions have been met to run the performance
tests for the related Readiness Monitor.
S The Readiness Monitor will be reset to "incomplete" if:
S ECM has lost power (battery or fuse).
S DTCs have been cleared.
S The conditions for running the Readiness Monitor have not been met.
S In the event that any Readiness Monitor shows "incomplete," follow the appropriate Readiness Monitor
Drive Pattern to activate the monitor and change the readiness status to "complete."
CAUTION:
Strictly observe the posted speed limits, traffic laws, and road conditions when performing these
drive patterns.
NOTICE:
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 fac-
tors) the drive pattern can be resumed, and in most cases, the readiness monitor will still set to "com-
plete".
To ensure rapid completion of readiness monitors, avoid sudden changes in vehicle load and speed
(driving up and down hills and/or sudden acceleration).
Contents:
TITLE STEP(s)
CATALYST MONITOR 2
EVAP MONITOR 3, 4
AIR-FUEL RATIO (A/F) AND OXYGEN SENSOR (O2S) MONITOR 5
OXYGEN SENSOR HEATER MONITOR 6
DI-28
DIAGNOSTICS - ENGINE (1GR-FE)
2. CATALYST MONITOR (ACTIVE AIR-FUEL RATIO CONTROL TYPE)
Vehicle Speed NOTICE:
Between This test will not be completed
(6)
40 mph and 70 mph if the vehicle is driven under
(64 km/h and 113 km/h) absolute constant speed
condition such as with cruise
control activated.
(5)
Idling
Ignition Switch OFF
Warm up 10 minutes
Time
(Note: Even when vehicle stops during driving pattern, test can be resumed) A23510
(a) Preconditions
The monitor will not run unless:
S The MIL is OFF
(b) Drive Pattern
(1) Connect a hand-held tester or OBD II scan tool to the DLC3.
(2) Turn the ignition switch to ON.
(3) Turn the tester or scan tool ON.
(4) Clear DTCs (where set) (see page DI-42).
(5) Start the engine and warm it up.
(6) Drive the vehicle at between 40 mph and 70 mph (64 km/h and 113 km/h) for at least 10 minutes.
(c) Monitor Status
(1) Check the Readiness Monitor status displayed on the tester or scan tool.
(2) If the status does not switch to COMPL (complete), extend the driving time.
DI-29
DIAGNOSTICS - ENGINE (1GR-FE)
3. EVAP MONITOR (VACUUM PRESSURE MONITOR)
NOTICE:
A cold soak must be performed prior to conducting the drive pattern to complete the Internal Pres-
sure Readiness Monitor.
(a) Cold Soak Preconditions
The monitor will not run unless:
S MIL is OFF
S Fuel level is approximately 1/2 to 3/4
S Altitude is 7,800 feet (2,400 m) or less
(b) Cold Soak Procedure
Let the vehicle cold soak for 8 hours or until the difference between IAT and ECT becomes less than
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