OBD DRIVE MODE [LF, L3]

• Perform the Drive Mode and inspect the OBD system for proper operation. The Drive Mode must be performed to ensure that no additional DTCs are present.

• During Drive Mode, the following systems are inspected:

- Oxygen sensor (HO2S)

- Oxygen sensor heater

- EGR

Caution

• While performing the Drive Mode, always operate the vehicle in a safe and lawful manner.

• When the WDS or equivalent is used to observe monitor system conditions while driving, be sure to have another technician with you, or record the data in the WDS or equivalent using the PID/DATA MONITOR AND RECORD function and inspect later.

Note

• Vehicle speed and engine speed detected by the PCM may differ from that indicated by the speedometer and tachometer. Use the WDS or equivalent to monitor vehicle speed.

• If the OBD system inspection is not completed during the Drive Mode, the following causes are considered:

1. The OBD system detects the malfunction.

2. The Drive Mode procedure has not completed correctly.

• Disconnecting the battery will reset the memory. Do not disconnect the battery during and after Drive Mode.

• The WDS or equivalent can be used at anytime through the course of Drive Mode to monitor the completion condition. Monitoring can be done by viewing the ON-BOARD SYSTEM READINESS menu.

PCM Adaptive Memory Procedure Drive Mode

Note

• The PCM adaptive memory condition can be confirmed with the RFCFLAG PID.

• If the RFCFLAG PID has been learned, the PCM Adaptive Memory Procedure Drive Mode is not necessary, because the PCM already has adaptive memory.

• If the RFCFLAG PID has not been learned, the PCM Adaptive Memory Procedure Drive should be performed before HO2S Heater, HO2S, and the TWC Repair Verification Drive Mode.

1. Start the engine and warm it up completely.

2. Verify that all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.

3. Perform noload racing at the engine speed shown in the graph, then idle the engine for more than 30 s after the cooling fan is stopped. If possible, monitor the RPM PID for engine speed and the FAN1 PID for the cooling fan condition during this procedure.

4. Turn the ignition switch to the OFF position then on again.

5. Access the RFCFLAG PID to confirm the PCM adaptive memory condition. If the RFCFLAG PID has been learned, the PCM Adaptive Memory Procedure Drive is completed.

6. If the RFCFLAGPID has still been learned, go back to Step 1.

HO2S Heater, HO2S, and EGR Repair Verification Drive Mode

1. Access the RFCFLAG PID to confirm the PCM adaptive memory condition. If the RFCFLAG PID has not been learned, perform the PCM Adaptive Memory Procedure Drive first.

2. If the RFCFLAG PID has been learned, start the engine and warm it up completely.

3. Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.

4. Drive the vehicle as shown in the graph; first drive in zone O, then A or B, followed by C or D, finally E or F. driving condition before the constant speed driving is not specified.

For MTX

For ATX

5. Stop vehicle and access the ON BOARD SYSTEM READINESS menu of the GENERIC OBD FUNCTION to inspect the Drive Mode completion condition. If completed, The RFC changes from NO to YES.

6. If not completed, Turn the ignition switch to the OFF position, then go back to Step 4.

7. Access the DIAGNOSTIC MONITORING TEST RESULTS menu of the GENERIC OBD FUNCTIONS to inspect the monitor results. If the MEAS are not within the specification, the repair has not completed.

8. Verify that no DTC is present.