OBD II Drive Mode Procedure

OBD-II DRIVE MODE

- Performing the Drive Mode inspects 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 inspected:
- EGR system
- Oxygen sensor (HO2S)
- Oxygen sensor heater
- Catalytic converter (TWC)
- Fuel, misfire and evaporative (EVAP) system

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 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 NGS tester to monitor vehicle speed.
- If the OBD-II system inspection is not completed during the Drive Mode, the following causes are considered:
1. The OBD-II system detects the malfunction.
2. The Drive Mode procedure is not completed correctly.
- Disconnecting the battery will reset the memory. Do not disconnect the battery during and after Drive Mode.
- The 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.

Mode 1 (PCM adaptive memory procedure drive mode)

NOTE:
- The PCM adaptive memory status can be confirmed with RFC FLAG PID.
- If RFC FLAG PID is ON, Mode 1 is not necessary, because PCM already has adaptive memory.
- If RFC FLAG PID is OFF, Mode 1 should be performed before Mode 2 or 3.

1. Start the engine and warm up completely.
2. Verify the following conditions and correct if necessary.
- All accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
- Initial ignition timing and idle speed are within specification.
- TEN and GND of DLC are not connected.

3. Perform no load racing at the engine speed shown in the graph, then idle the engine for more than 20 seconds after the cooling fan stopped. If possible, monitor RPM PID for engine speed and FAN3 PID for cooling fan status during this procedure.
4. Turn ignition key off then on again.
5. Access to RFC FLAG PID to confirm PCM adaptive memory status. If RFC FLAG PID is ON, Mode 1 is completed.
6. If RFC FLAG PID is still OFF, go back to Step 1.

Mode 2 (EGR system repair verification drive mode)

1. Access to RFC FLAG PID to confirm PCM adaptive memory status. If RFC FLAG PID is OFF, perform Mode 1 first.
2. If RFC FLAG PID is ON, start the engine and warm 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.
5. Stop vehicle and access to ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTION to inspect the Drive Mode completion status. If completed, RFC changes from NO to YES.
6. If not completed, turn the ignition key off then go back to Step 4.
7. Access to DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to inspect the monitor results. If MEAS are not within specification, repair has not completed.
8. Verify no DTCs are available.

Mode 3 (HO2S heater, HO2S, and TWC repair verification drive mode)

1. Access to RFC FLAG PID to confirm PCM adaptive memory status. If RFC FLAG PID is OFF, perform Mode 1 first.
2. If RFC FLAG PID is ON, start the engine and warm 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. Driving condition before the constant speed driving is not specified.
5. Stop vehicle and access to ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTION to inspect the Drive Mode completion status. If completed, RFC changes from NO to YES.
6. If not completed, turn the ignition key off then go back to Step 4.
7. Access to DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to inspect the monitor results. If MEAS are not within specification, repair has not completed.
8. Verify no DTCs are available.

Mode 4 (EVAP system repair verification drive mode)

NOTE:
- If Mode 4 can not be performed (you can not drive the vehicle under Mode 4 condition), perform evaporative system test procedure as an alternative.
- Mode 4 can be performed regardless RFC FLAG condition.

1. Verify all following PIDs are within the following specifications. All PIDs must be within specifications before engine started to initiate the evaporative system test.
- BARO: 72.0 kPa {540 mmHg, 21.3 inHg} or higher
- IAT: 10 - 60 °C {50 - 140 °F}
- FTL V: 0.5 - 2.5 V
- ECT is -10 °C - X °C (14 °F - X °F} (X, the ECT upper limit, is determined according to the barometric pressure as shown in the graph.)

2. Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
3. Start the engine and race it at 3,500 rpm to warm up completely.