F–64
ON-BOARD DIAGNOSTIC
OBD DRIVE MODE
A6E397018881W09
• Performing the Drive Mode inspects 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
— Catalytic converter (TWC)
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 condition 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 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 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 RFCFLAG PID.
• If RFCFLAG PID is ON, PCM Adaptive Memory Procedure Drive Mode is not necessary, because PCM
already has adaptive memory.
• If RFCFLAG PID is OFF, PCM Adaptive Memory Procedure Drive should be performed before HO2S
Heater, HO2S, and TWC Repair Verification Drive Mode.
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.
A6E3970W003
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