Drive Pattern No.3 & 4: Catalyst Monitors
DRIVE PATTERN NO. 3: Catalyst Monitor (O2S Type)
Preconditions
The monitor will not run unless:
^ MIL is OFF.
^ ECT (Coolant Temp) is 176°F (80°C) or greater.
^ IAT (Intake Air) is 14°F (-10°C) or greater.*
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions (less than 14° / -10°C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine start-up. The driving time must be adjusted during step "a" based upon IAT (Intake Air) value at start-up.
a. Drive the vehicle at 40 - 55 mph (64 - 88 km/h) for the time described below:
^ If IAT (Intake Air) was less than 50°F (10°C) when the engine was started, drive for 7 minutes.
^ If IAT (Intake Air) was greater than 50°F (10°C) when the engine was started, drive for 3 minutes.
b. Drive the vehicle at 35 - 45 mph (56 - 72 km/h) for approximately 7 minutes.
NOTE:
^ Drive with smooth throttle operation.
^ Avoid sudden acceleration.
^ Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" and "b."
NOTE:
The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
^ Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
^ Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
^ Once a second trip is completed, a current DTC will be stored.
DRIVE PATTERN NO. 4: Catalyst Monitor (AF Sensor Type)
Preconditions
The monitor will not run unless:
^ MIL is OFF.
^ ECT (Coolant Temp) is 176°F (80°C) or greater.
^ IAT (Intake Air) is 14°F (-10°C) or greater*.
* For 2002 MY and later vehicles: The readiness test can be completed in cold ambient conditions (less than 14°F / - 10°C), if the drive pattern is repeated a second time after cycling the ignition OFF.
Drive Pattern Procedure
Connect the OBDII Scantool to DLC3 to check monitor status and preconditions.
Note the IAT (Intake Air) value during engine start-up. The driving time must be adjusted during step "a" based upon IAT (Intake Air) value at start-up.
a. Drive the vehicle at 40 - 55 mph (64 - 88 km/h) for the time described below:
^ If IAT (Intake Air) was less than 50°F (10°C) when the engine was started, drive for 7 minutes.
^ If IAT (Intake Air) was greater than 50°F (10°C) when the engine was started, drive for 3 minutes.
b. Drive the vehicle allowing speed to fluctuate between 35 - 45 mph (56 - 72 km/h) for about 16 minutes.
NOTE:
^ Drive with smooth throttle operation.
^ Avoid sudden acceleration.
^ Avoid sudden deceleration as much as possible with the throttle fully closed.
If readiness status does not switch to "complete," ensure preconditions are met, turn the ignition OFF, then repeat steps "a" and "b."
NOTE:
The readiness status may not switch to "complete" after the first drive pattern trip if a Pending Code has been set (first trip for a two-trip DTC).
^ Pending Codes are available from the DTC Info Menu in Enhanced OBDII.
^ Pending Codes indicate a POTENTIAL problem was detected. A second trip is needed to confirm the DTC prior to diagnosis.
^ Once a second trip is completed, a current DTC will be stored.