Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KL]
DTC P0125
Insufficient engine coolant temperature to enter a closed loop fuel control
DESCRIPTION
• DTC P0125 Indicates ECT sensor has not achieved required temperature level to enter
closed loop operating conditions within specified amount of time after starting engine. This
code will light MIL
[Possible Cause]
• Insufficient warm up time • Low coolant
• Leaky or stuck open thermostat
STEP
INSPECTION ACTION
1 DTC P0125 INDICATES EXCESSIVE TIME
TO ENTER CLOSED LOOP FUEL CONTROL
• Check coolant level.
• Is coolant level correct?
Yes Check thermostat.
t y 0 1-12 THERMOSTAT INSPECTION
No FILL to proper level.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
COMPLETE Comprehensive Component Monitor Drive
Mode.
RERUN OBD Test.
DTC P0133
P0153
Heated oxygen sensor (Front RH) (H 02S 11) circuit low response
Heated oxygen sensor (Front LH) (H 02S 21) circuit low response
DESCRIPTION
• DTC P0133 and P0153 indicate response rate of heated oxygen sensor is below some
calibrated window
[Possible Cause]
• Contaminated heated oxygen sensor • MAF sensor
• Exhaust leaks • Air leaks
• Shorted/open wires • Deteriorating heated oxygen sensor
• Improper fueling
STEP
INSPECTION ACTION
1 PERFORM KEY ON ENGINE RUNNING
(KOER) SELF TEST
• Key on, engine running and engine at
operating temperature.
• Activate key on engine running (KOER)
self-test.
• Is DTCs P1127 present during KOER
self-test?
Yes
Go to DTC chart and service DTCs P1127 as necessary.
No Go to next step.
2 HEATED OXYGEN SENSOR RESPONSE
TEST
• Key off.
• NGS tester connected.
• Key on, engine off.
• Select Generic OBD II function from menu
and trigger.
• Press Continue.
• Select Diagnostic Monitoring Test Results
from menu and trigger.
• Scroll to Test ID: 01 trigger and press start.
•
Does measured value indicate greater
than 614?
Yes RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
REPEAT step 1.
If test results indicate pass, testing Is complete.
No Oxygen sensor test results indicate fail.
Go to next step.
3
CHECK FOR SOURCE OF POTENTIAL
HEATED OXYGEN SENSOR
CONTAMINATION
• Investigate following items as potential
source of heated oxygen sensor
contamination.
• Use
of
unapproved silicone sealers
• Fuel contaminated
by
silicone additives
• Excessive oil burning (i.e. rings, valve
seals and oil overfill)
• Glycol (antifreeze) leaking internally in
engine
• Contaminated fuel
• Use of unapproved cleaning agents
• Are any of above conditions present?
Yes
SERVICE
source of contamination.
REPLACE heated oxygen sensor and oil/filter.
RESET PCM to completely clear DTCs.
o ’ After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No
Go to next step.
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