Mazda MX-6 1998, Workshop Manual

Page: 73 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
STEP
INSPECTION ACTION
43 MONITOR HEATED OXYGEN SENSOR (PID)
FOR PROPER SWITCHING
• Key on, engine running.
• Engine at operating temperature.
• Connect NGS tester.
Note
• Heated oxygen sensor PID displayed as
0 2 S on NGS tester.
• Access PID of suspected heated oxygen
sensor.
• 02S11
• Monitor PID while wiggling, bending, and
shaking small sections of harness from
PCM to heated oxygen sensor.
• Did heated oxygen sensor voltage stay
high (greater than 0.45 volt) or low (less
than 0.45 volt)?
Yes ISOLATE cause of lack of heated oxygen sensor
switching. Service harness or connector.
RESET PCM to completely clear DTCs.
xt
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No Go to next step.
44
TEST DRIVE WHILE MONITORING HEATED
OXYGEN SENSOR PID FOR PROPER
SWITCHING
Note
• This test step requires an observer to
monitor PID for proper operation.
• NGS tester connected.
• W hile observer views heated oxygen
sensor PID, test drive vehicle under
different road conditions in attempt to
simulate original fault.
• Does heated oxygen sensor appear to
switch properly?
Yes UNABLE to duplicate fault.
RESET PCM to completely clear DTCs.
xt
After Repair Procedure
Testing complete at this time.
No REPLACE heated oxygen sensor.
RESET PCM to completely clear DTCs.
xt
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
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