Drive Cycles

DRIVE CYCLES

Description of OBD II Drive Cycle

The purpose of the OBD II drive cycle is to execute the OBD II monitors and identify any concerns with the OBD II system. The DTC P1000 code will be erased of all OBD II monitors that have completed during the OBD II drive cycle.

WARNING:Strict observance of posted speed limits and attention to driving conditions are mandatory when proceeding through the following drive cycles. Failure to follow these instructions may result in personal injury.The IDS or equivalent tester will be used to observe the status of each OBD II monitor at the completion of the OBD II drive cycle. The completion status of the exhaust gas recirculation (EGR), heated oxygen sensor (HO2S), evaporative emission (EVAP), and catalyst efficiency monitors can be monitored during the OBD II drive cycle by viewing the On-Board Readiness Menu on the IDS or equivalent tester.
For the description and operation of each OBD II monitor, see Engine OBD II Monitors.

Drive Cycle Recommendations

1. Most OBD II monitors will complete more readily using a steady foot driving style during cruise or acceleration modes. Operating the throttle in a smooth fashion will minimize the time required for monitor completion.

2. Fuel tank level should be between 1/2 and 3/4 fill with 3/4 fill being the most desirable.

3. The evaporative monitor can only operate during the first 30 minutes of engine operation. When executing the procedure for this monitor, stay in part throttle mode and drive in a smooth fashion to minimize fuel slosh.

Vehicle Preparation

1. Attach IDS or equivalent tester and access the ECT, FLI, and IAT PIDs.

- Verify the IAT PID is between 4-38°C (40-100°F)
- Verify the FLI PID is between 50% and 75%

2. Warm the vehicle until the ECT PID reaches a minimum of 77°C (170°F).

3. Without returning to key OFF, clear all DTCs using IDS or equivalent tester generic OBD II function. DTC P1000 will remain.

4. Access the On-Board System Readiness Menu on the IDS or equivalent tester to view the status of the OBD II monitors.

5. Proceed with the selected monitor repair verification drive cycle. Once started, the engine must not be turned off.

OBD II Drive Cycle

NOTE:
- Once started, the engine must not be turned off during the drive cycle.

1. Start the engine and drive the vehicle.

2. Drive in stop and go traffic for 20 minutes with at least 4 idle periods.

3. Drive on an expressway or highway for 10 to 15 minutes. Access and monitor the IAT PID on the scan tool during the entire highway drive. Heavy accelerations, sudden decelerations or wide open throttles are not recommended on any vehicle.

NOTE:If inlet air temperature is below 4°C (40°F) at any time during the highway drive, the evaporative emission monitor will not complete.
4. Access the ON BOARD SYSTEM READINESS menu to check completion status.

5. Rerun continuous memory self-test to check P1000 code status.

NOTE:If the evaporative emission monitor is the only monitor not showing completion status on the IDS or equivalent tester and P1000 has been cleared, the OBD II drive cycle has been completed.

Monitor Repair Verification Drive Cycles

Comprehensive Component Monitor Repair Verification Drive Cycle

1. Complete vehicle preparation.

2. For M/T, accelerate from 0 to 80 km/h (0 to 50 mph). Continue to step 3. For A/T, from a stop and in overdrive, moderately accelerate to 80 km/h (50 mph) and cruise for at least 15 seconds. Stop vehicle and repeat without overdrive to 64 km/h (40 mph) cruising for at least 30 seconds. While at 64 km/h (40 mph), activate overdrive and accelerate to 80 km/h (50 mph) and cruise for at least 15 seconds. Stop for at least 20 seconds and repeat step 2 five times.

3. From a stop, accelerate to 104 km/h (65 mph). Decelerate at closed throttle until 64 km/h (40 mph) (no brakes). Repeat this 3 times.

4. Verify no DTCs are retrieved with exception of P1000.

EGR Monitor Repair Verification Drive Cycle

1. Complete vehicle preparation.

2. From stop, accelerate to 72 km/h (45 mph) at 1/2 to 3/4 throttle. Repeat 3 times.

- Verify no DTCs are retrieved with exception of P1000.

HO2S Monitor Repair Verification Drive Cycle

1. Complete vehicle preparation.

2. Cruise at 64 km/h (40 mph) for at least 5 minutes.

3. Verify no DTCs are retrieved with exception of P1000.

Fuel or Misfire Monitor Repair Verification Drive Cycle

1. Complete vehicle preparation.

2. Perform the following drive procedure three consecutive times.

- Accelerate on highway to 104 km/h (65 mph)
- Coast down with foot off the accelerator pedal (no brakes) from 104 km/h to 64 km/h (65 mph to 40 mph)

3. Verify no DTCs are retrieved with exception of P1000.

EVAP Running Loss System Repair Verification Drive Cycle

NOTE:When the ambient air temperature outside is 4.4 to 37.8°C (40 to 100°F), or the altitude is above 2438 meters (8000 feet), the EVAP monitor will not run. FLI PID must be between 15 and 85%.
1. Complete vehicle preparation.

2. Cruise at 72 to 104 km/h (45 to 65 mph) for 10 minutes (avoid sharp turns and hills).

3. To initiate the EVAP monitor, the EVAPPDC PID must increase to at least 75% (canister purge vent open). At this time, the EVAPCV PID will then display 100% (canister vent solenoid closed to seal the system) and the monitor will begin to run. Continue to drive at steady throttle with light steering until the EVAPCV displays 0% (canister vent solenoid open, system unsealed).

4. Bring the vehicle to a stop.

5. With the scan tool, view the EVAP monitor for completion through the On-Board System Readiness Tests Menu. Repeat Step 2 if the EVAP monitor is not complete.

6. Verify no DTCs are retrieved with exception of P1000.

Catalyst Monitor Repair Verification Drive Cycle

1. Complete vehicle preparation.

2. Drive in stop-and-go traffic conditions. Include five different constant cruise speeds, ranging from 40 to 72 km/h (25 to 45 mph) over a 10 minute period.

3. Verify no DTCs are retrieved with exception of P1000.