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Home >> Mazda >> 1999 >> Millenia V6-2.5L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Monitors, Trips, Drive Cycles and Readiness Codes

Monitors, Trips, Drive Cycles and Readiness Codes

OBD II Drive Mode
Performing 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)
- Oxygen sensor heater
- Catalytic converter(TWC)
- Fuel, misfire and evaporative emission (EVAP) control 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 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.

- If the OBD II system check 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 produce 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 FAN 3 PID for cooling fan status during this procedure.

4. Turn ignition key to OFF then to ON again. Access to RFC FLAG PID to confirm PCM adaptive memory status.
- If RFC FLAG PID is ON, Mode 1 is completed.
- If RFC FLAG PID is still OFF, repeat steps 1 to 3.

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.
- If RFC FLAG PID is ON, go to next step.

2. 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 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 2 to 4 at least one more time.

6. Access to DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to check the monitor results. If "MEASs" are not within specification, repair has not completed.
7. Verify no DTCs are available.

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

1. Access to RFC PID to confirm PCM adaptive memory status.
- If RFC FLAG PID is NO, perform Mode 1 first
- If RFC FLAG PID is YES, go to next step

2. 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 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 2 to 4 at least one more time.

6. Access to DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to check the monitor results. If "MEASs" are not within specification, repair has not completed.
7. Verify no DTCs are available.

Mode 4 (EVAP system repair verification drive mode)

NOTE: 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 is started to initiate the EVAP system test.




- ECT is -10 ° C {14° F} -X° C {X° F} (X, the ECT upper limit, is determined according to the barometric pressure as shown the graph.)
- IAT is 10 - 60° C {50 - 140° F}
- BARO is 72.0 kPa {540 mmHg, 21.3 in.Hg}
- FTL V is 0.5 - 2.5 V

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.
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 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 2 to 4 at least one more time.

6. Access to DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD II FUNCTIONS to check the monitor results. If "MEASs" are not within specification, repair has not completed.
7. Verify no DTCs are available.
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