Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 2004 >> MPV V6-3.0L DOHC >> Repair and Diagnosis >> Powertrain Management >> Emission Control Systems >> Testing and Inspection

Emission Control Systems: Testing and Inspection

OBD-II DRIVE MODE
- Using the OBD-II drive mode, the monitoring item requested by OBD-II regulations can be easily diagnosed.
- Performing the Drive Mode inspects the OBD-II system for proper operation and must be performed to ensure that no additional DTCs are present.
- The OBD-II drive mode is divided into the specific drive mode and single drive mode.
- For the specific drive mode, specified drive modes have been set for each individual monitoring item requested by OBD-II regulations, and they can be diagnosed individually. For the single drive mode, the entire monitoring item requested by OBD-II regulations can be diagnosed.
- The following modes are in the specific drive mode. The applicable system is diagnosed by driving in the following drive modes.
- PCM Adaptive Memory Produce Drive Mode
- EGR System Repair Verification Drive Mode
- HO2S heater, HO2S, and TWC Repair Verification Drive Mode
- EVAP System Repair Verification Drive Mode

- The following systems are diagnosed with the single drive mode.
- 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 WDS or equivalent is used to observe monitor system status 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-II system inspection is not completed during the Drive Mode, the following causes are considered:
- The OBD-II system detects the malfunction.
- 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 WDS or equivalent can be used at anytime through the course of the Drive Mode to monitor the completion status. Monitoring can be done by viewing the ON BOARD SYSTEM READINESS menu.
- The OBD monitoring status can be confirmed with the ignition switch operation. During KOEO, the MIL illuminates for a fail-light inspection for approx. 17 s. The OBD monitoring status is confirmed after the fail-light inspection.
- If all of the diagnosis is completed even one time, the MIL will continue to illuminate.
- If all of the diagnosis is not completed, the MIL flashes for approx. 7 s, and then it illuminates until the engine is started.

Mode 1 (PCM Adaptive Memory Produce Drive Mode)
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.

3. Perform no load racing at the engine speed of 2,500-3,500 rpm for 15 s or more, then idle the engine for 60 s or more after the cooling fan stopped. If possible, monitor RPM PID for engine speed during this procedure.

Mode 2 (EGR System Repair Verification Drive Mode)
1. Perform "PCM Adaptive Memory Produce Drive Mode" first.
2. Verify that all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.




3. Drive the vehicle as shown in the graph.
4. Stop the vehicle and access to ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTION to verify the OBD monitoring status.
- If completed, the OBD monitoring status items change from non-completed to completed.
- If not completed, turn the ignition key off then repeat from Step 3.

5. Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to verify the monitor results.
- If detected values are not within specification, repair has not been completed.

6. Verify no DTCs are available.

Mode 3 (HO2S heater, HO2S, and TWC Repair Verification Drive Mode)
1. Perform "PCM Adaptive Memory Produce Drive Mode" first.
2. Verify that all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.




3. Drive the vehicle as shown in the graph.The driving condition before driving at constant speed driving is not specified.
4. Stop the vehicle and access to ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTION to verify the OBD monitoring status.
- If completed, the OBD monitoring status items change from non-completed to completed.
- If not completed, turn the ignition key off then repeat from Step 3.

5. Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to verify the monitor results.
- If detected values are not within specification, repair has not been completed.

6. Verify no DTCs are available.

Mode 6 (EVAP System Repair Verification Drive Mode)

NOTE: If "EVAP System Repair Verification Drive Mode" cannot be performed (you cannot drive the vehicle under the specified condition), perform evaporative system test procedure as an alternative.

1. Verify that all of the following PIDs are within the following specifications.All PIDs must be within specifications before engine is started to initiate the evaporative system test.
- BARO: 72.2 kPa {541 mmHg, 21.2 inHg} or higher
- IAT: 5-35 °C {41-95 °F}
- FTL: 15-85 %
- VPWR: 10.9-14.6 V

2. Clear DTCs from PCM memory using the WDS or equivalent.
3. Start the engine and idle it for 10 s or more, then turn ignition key to OFF.
4. Leave the vehicle is this condition for 5 hours or more.
5. Start the engine and idle it for 15 min or more.
6. Drive the vehicle at the engine speed of 65-80 km/h {40-50 mph} for 5 min or more.
7. Stop the vehicle and turn ignition key to OFF.
8. Leave vehicle in this condition for 10 min or more.
9. Start the engine.
10. Stop the vehicle and access to ON BOARD SYSTEM READINESS menu of GENERIC OBD II FUNCTION to verify the OBD monitoring status.
- If completed, the OBD monitoring status items change from non-completed to completed.
- If not completed, turn the ignition key off then repeat from Step 3.

11. Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to verify the monitor results.
- If detected values are not within specification, repair has not been completed.

12. Verify no DTCs are available.

Single Drive Mode (PCM Adaptive Memory Produce, EGR System Repair Verification, HO2S heater, HO2S, TWC, and EVAP System Verification Drive Mode)
1. Start the engine and warm it up completely.
2. Clear the DTC from the PCM memory using the WDS or equivalent.
3. 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 the specification.

4. Verify that all of the following PIDs are within the following specifications.All PIDs must be within specifications from Step 5 to Step 6.
- BARO: more than 72.2 kPa {541 mmHg, 21.2 inHg}
- IAT: 5-35 °C {41-95 °F}
- FTL: 15-85 %
- B+: 10.9-14.6 V




5. With the vehicle stopped, race the engine at the engine speed indicated, and then drive the vehicle as shown in the graph. The driving conditions before driving at constant speed are not specified. If possible, monitor RPM PID for engine speed during this procedure.
6. Stop the engine.
7. Access ON BOARD SYSTEM READINESS menu of GENERIC OBD-II FUNCTION to verify the OBD monitoring status.
- If completed, all of the OBD monitoring status items change from non-completed to completed.
- If not completed, turn the ignition switch off, then perform the applicable specific drive mode for any monitoring item that was not in the detection condition.

8. Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD-II FUNCTIONS to verify the monitor results.
- If detected values are not within specification, repair has not been completed.
pro multis · About Operation CHARM