Monitors, Trips, Drive Cycles and Readiness Codes
OBD II Drive Mode OutlinePerforming the drive mode checks the OBD II system for proper operation and must be performed to ensure that no additional DTCs are present. During drive mode, the following Systems are checked:
- EGR system
- Oxygen sensor (HO2S) and Oxygen sensor heater
- Catalytic converter (TWC)
- Fuel, misfire and evaporative emission (EVAP) control system
You have two options for conducting OBD II drive mode:
- Standard drive mode
- Individual system repair verification drive mode
CAUTION:
- While performing the drive mode, always operate the vehicle in a safe and lawful manner.
- When the NGS tester is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the NGS tester by using the PID/DATA MONITOR AND RECORD function and check later.
NOTE:
- Vehicle speed and engine speed detected by the PCM may differ from that indicated by the speedometer and tachometer. Use the NGS tester to monitor vehicle speed.
- Once started, the engine must not be turned "OFF" during the drive mode.
- NGS tester can be used at anytime through the course of drive mode to monitor the completion status. Monitoring can be done by viewing the ON BOARD SYSTEM READINESS menu or TRIP PID.
Drive Mode Implementation Condition
Each OBD II system is monitored (for less than 1 minute) when the specifications below are met.
NOTE:
- HO2S/TWC monitoring will begin 5 minutes after starting the engine.
- EVAP system monitoring will begin 4 minutes from engine start, and quit monitoring after 10 minutes. If monitoring is required after 10 minutes, the engine must be turned off, then restarted.
Standard Drive Mode
1. Cold soak the vehicle for at least 8 hours before performing the EVAP test.
NOTE: When the 8-hour-timer bypass procedure is performed, the cold soak period can be shorten up to 3 hours depending on vehicle conditions. If you shorten the soak period, the PCM may detect malfunction by mistake even though the EVAP system has been repaired correctly. This misdiagnosis will happen more often under warm or hot ambient temperature. If you are not sure whether the system still have malfunction, soak 8 hours and perform the drive mode again. If malfunction is not detected, the repair is completed.
2. Connect NGS tester to data link connector.
3. Turn OFF all accessory load (A/C, head lights, blower fan, etc.).
4. Start engine.
5. Drive vehicle and accelerate to 65 km/h (40 mph) within 20 seconds.
6. Drive vehicle at 56 - 73 km/h (35 - 45 mph) for 5.5 minutes.
7. Accelerate to 80 - 96 km/h (50 - 60 mph) within 10 seconds and drive vehicle for at least 2 minutes.
8. Return to idle for at least 20 seconds.
9. Stop vehicle and access to "ON BOARD SYSTEM READINESS" menu of "GENERIC OBD II FUNCTION" to check the drive mode completion status.
- If completed, RFC changes from "NO" to "YES".
- If not completed, turn the ignition key to off then repeat steps 4 to 9 at least one more time.
10. Access to "DIAGNOSTIC MONITORING TEST RESULTS" menu of "GENERIC OBD II FUNCTIONS" to check the monitor results. If "MEAS" are not within specification, repair has not completed.
11. Verify no DTCs are available.
8-hour Timer Bypass Procedure
NOTE: When 8-hour-timer is bypassed, PCM may misdiagnose the EVAP system if fuel temperature is warm. It is important to cool down the fuel tank as much as possible during the shortened soak period.
1. Connect NGS tester and turn the ignition to ON.
2. Access to "CLEAR DIAGNOSTIC CODES" menu of "GENERIC OBD II FUNCTIONS".
3. Press the "TRIGGER" to reset the 8-hour-timer.
4. Leave the ignition key to ON position.
5. Follow the drive mode procedure.
EGR System Repair Verification Drive Mode
NOTE:
- The IAT PID must be above 10 °C (50 °F) to initiate the EGR monitor.
- After the monitoring conditions are set, system testing requires at least 30 seconds to complete.
1. Connect NGS tester to data link connector.
2. Warm vehicle up to at least an engine coolant temperature (ECT PID) of 74 °C (165 °F).
3. Verify all accessory loads (A/C, P/S, head light, blower fan) are off.
4. Drive vehicle within 77 - 204 km/h (48 - 127 mph) and maintain a constant speed for at least 2 minutes.
5. Return to idle for at least 20 seconds.
6. Stop vehicle and access to "ON BOARD SYSTEM READINESS" menu of "GENERIC OBD II FUNCTION" to check the drive mode completion status.
- If completed, RFC changes from "NO" to "YES".
- If not completed, turn the ignition key to off then repeat steps 3 to 6 at least one more time.
7. Access to "DIAGNOSTIC MONITORING TEST RESULTS" menu of "GENERIC OBD II FUNCTIONS" to check the monitor results. If "MEAS" are not within specification, repair has not completed.
8. Verify no DTCs are available.
HO2S/TWC Repair Verification Drive Mode
NOTE:
- The IAT PID must be below 76 °C (170 °F) to initiate the H02S/TWC monitor.
- The FLI PID must be above 15% to initiate the H02S/TWC monitor.
- Monitor implement waiting condition will start after 5 minutes of engine started.
- After the monitoring conditions are set, system testing requires at least 30 seconds to complete.
1. Connect NGS tester to data link connector.
2. Warm vehicle up and verify ECT PID is within 80 - 115 °C (175 - 240 °F).
3. Drive vehicle within 4 - 204 km/h (3 - 127 mph) and maintain a constant speed for at least 2 minutes.
4. Return to idle for at least 20 seconds.
5. Stop vehicle and access to "ON BOARD SYSTEM READINESS" menu of "GENERIC OBD II FUNCTION" to check the drive mode completion status.
- If completed, RFC changes from "NO" to "YES".
- If not completed, turn the ignition key to off then repeat steps 3 to 5 at least one more time.
6. Access to "DIAGNOSTIC MONITORING TEST RESULTS" menu of "GENERIC OBD II FUNCTIONS" to check the monitor results. If "MEAS" are not within specification, repair has not completed.
7. Verify no DTCs are available.
EVAP System Repair Verification Drive Mode
NOTE:
- The IAT PID must be within -6.7 - 37.6 °C (20 - 100 °F) to initiate the EVAP system monitor.
- The FLI PID must be within 15 - 85% to initiate the EVAP system monitor.
- The drive mode conditions (shown in the table) must be met within 4 to 10 minutes after starting the engine. If the time exceeds 10 minutes, turn the ignition key "OFF" to reset the timer then restart engine.
- After the monitoring conditions are set, system testing requires at least 30 seconds to complete.
- Fuel tank pressure will change as follows during monitoring.
1. Cold soak the vehicle for at least 8 hours.
NOTE: The cold soak period can be shorten up to 3 hours depending on vehicle conditions when the 8-hour-timer bypass procedure is performed. If you shorten the soak period, the PCM may detect malfunction by mistake even though the EVAP system has been repaired correctly. This misdiagnosis will happen more often under warm or hot ambient temperature. If you are not sure whether the system still have malfunction, soak 8 hours and perform the drive mode again. If malfunction is not detected, the repair is completed.
2. Connect NGS tester to data link connector.
3. Turn off all accessory (A/C, head lights, blower fan, etc.).
4. Drive vehicle within 61 - 104 km/h (38 - 65 mph).
5. Maintain a constant speed for at least 2 minutes within 4 to 10 minutes after starting the engine.
6. Return to idle for at least 20 seconds.
7. Stop vehicle and access to "ON BOARD SYSTEM READINESS" menu of "GENERIC OBD II FUNCTION" to check the drive mode completion status.
- If completed, RFC changes from "NO" to "YES".
- If not completed, turn the ignition key to off then repeat steps 5 to 8 at least one more time.
8. Access to "DIAGNOSTIC MONITORING TEST RESULTS" menu of "GENERIC OBD II FUNCTIONS" to check the monitor results. If "MEAS" are not within specification, repair has not completed.
9. Verify no DTCs are available.