Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
DTC P0136
P1137
P1138
Heated oxygen sensor (Middle) (H 02S 12) circuit malfunction
Lack of heated oxygen sensor (Middle) (H 02S 12) switch sensor indicates lean
Lack of heated oxygen sensor (Middle) (H 02S 12) switch sensor indicates rich
DESCRIPTION
• DTC P0136 indicate output voltage of middle heated oxygen sensor is less than some
calibratable functional window.
• DTC P1137 and P1138 can only be retrieved during key on engine running (KOER)
self-test when fuel control Is ramped rich and lean and monitored for voltage change on
rear heated oxygen sensor.
[Possible Cause]
• W iring Concerns • Other Concerns
• Pinched, shorted, and corroded wiring and pins • Exhaust leaks
• Crossed sensor wires • Contaminated or damaged sensor
STEP
INSPECTION
ACTION
1 DTCS P0136 MONITOR MIDDLE HEATED
OXYGEN SENSOR OUTPUT VOLTAGE FOR
ACTIVITY
• Are any of above concerns present?
Yes SERVICE as necessary.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No Continuous Memory DTCs P0136:
Go to next step.
All others:
Go to step 3.
2 CHECK FOR KOER DTCS P1137 AND
P1138
• Key off.
• NGS tester connected.
• Key on.
• Engine at 2,000 rpm for 3 minutes.
• Active KOER Self-Test.
• Check for DTCs.
•
Are DTCs P1137 or P1138 present?
Yes Go to next step.
No
Fault may be intermittent.
Intermittent poor connection or component malfunction
(SERVICE or REPLACE as necessary).
Go to ENGINE SYMPTOM TROUBLESHOOTING No. 27.
3 CHECK EXHAUST SYSTEM FOR LEAKS
Note
• Any exhaust leaks between engine and
end of warm up three way catalytic
converter may cause DTCs P0136.
• Key off.
• Raise vehicle.
• Inspect following:
• Exhaust flanges for leaks
• Heated oxygen sensor tightening torque
• Check for punctures and cracks in three
way catalytic converter and pipes lead­
ing to them
• Are there any exhaust leaks?
Yes
REPLACE or SERVICE as required.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No Go to next step.
0 1 -0 1 B -3 0