- Oxygen sensor (HO2S)
- Oxygen sensor heater
- Catalytic converter (TWC)
Caution
Note
1. The OBD system detects the malfunction.
2. The Drive Mode procedure is not completed correctly.
PCM Adaptive Memory Procedure Drive Mode
Note
1. Start the engine and warm it up completely.
2. Verify all accessory loads (A/C, headlights, blower fan, rear window defroster) are off.
3. Perform no load 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 RPM PID for engine speed and FAN1 PID for cooling fan condition during this procedure.
4. Turn ignition key off then on again.
5. Access to RFC FLAG PID to confirm PCM adaptive memory condition. If RFCFLAG PID is ON, PCM Adaptive Memory Procedure Drive is completed.
6. If RFCFLAGPID is still OFF, go back to Step 1.
HO2S Heater, HO2S, and TWC Repair Verification Drive Mode
1. Access to RFCFLAG PID to confirm PCM adaptive memory condition. If RFCFLAG PID is OFF, perform PCM Adaptive Memory Procedure Drive first.
2. If RFCFLAG PID is ON, 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 to ON BOARD SYSTEM READINESS menu of GENERIC OBD FUNCTION to inspect the Drive Mode completion condition. If completed, RFC changes from NO to YES.
6. If not completed, turn the ignition key to OFF, then go back to Step 4.
7. Access DIAGNOSTIC MONITORING TEST RESULTS menu of GENERIC OBD FUNCTIONS to inspect the monitor results. If MEAS are not within the specification, repair has not completed.
8. Verify no DTC is available.
Mazda 6 Service Manual: Procedures for determining the location of a malfunction
System Wiring Diadram
PCM
1. Check the display of DTC U0121 and/or U0155, using the SST (WDS or
equivalent). (See DTC TABLE.)
2. Referring to the following table, determine the malfunctioning part of the
CAN system.
ABS/TCS HU/CM or DSC HU/CM
1. Accec and monitor the PCM MSG and IC MSGo ...
Mazda 6 Service Manual: No.4 air intake mode does not change
When performing an asterisked (*) troubleshooting inspection, shake the
wiring harness and connectors while performing the inspection to discover
whether poor contact points are the cause of any intermittent malfunctions.
If there is a problem, check to make sure connectors, terminal ...