Mazda MX-6 1998, Руководство по ремонту, Страница: 64 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
STEP INSPECTION
ACTION
7
CHECK HEATED OXYGEN SENSOR
C IR C U IT W IR IN G H A R N E S S FOR S HO RT
TO GROUND
• Key off.
• Breakout box installed. PCM disconnected.
• Heated oxygen sensor disconnected.
• Measure resistance between heated
oxygen sensor signal Test Pin 60 and Test
Pins 23, 24, 51, 76, 7 7 ,1 0 3 and 91 at
breakout box.
• Is each resistance greater than 10,000
ohms?
Yes Go to next step.
No
SERVICE short circuit.
REMOVE breakout box.
RECONNECT PCM and heated oxygen sensor.
RESET PCM to completely clear DTCs.
&■
After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
8
CHECK HEATED OXYGEN SENSOR FOR
SHORT TO GROUND OR PCM GROUND
(BETWEEN PCM AND H 02S GROUND
CIRCUIT)
• Key off.
• Breakout box installed. PCM disconnected.
• Reconnect heated oxygen sensor.
• Measure resistance between ground and
PCM ground Test Pins and heated oxygen
sensor signal Test Pin at breakout box:
• Heated oxygen sensor (Front)=Test Pin
60
• Ground=Test Pin 24 and 103
• PCM ground=Test Pin 91
• Is resistance greater than 10,000 ohms?
Yes
REMOVE breakout box.
RECONNECT heated oxygen sensor.
REPLACE PCM.
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No REPLACE heated oxygen sensor.
REMOVE breakout box.
RECONNECT PCM.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
9 HEATED OXYGEN SENSOR CIRCUIT
CHECK (FOR RICH DTCS)
• Key off.
• Disconnect suspected heated oxygen
sensor. Inspect for damage*, or pushed out
pins, corrosion and loose wires. Service as
necessary.
• NGS tester connected.
• Access 02S11 PID.
• Is reading 0.2 volt or less?
Yes
Go to step 11 .
No A short to power exists.
Go to next step.
10 CHECK FOR SHORTS TO VOLTAGE
SOURCE IN HARNESS CIRCUIT
• Key off.
• Disconnect NGS tester from DTC.
• Disconnect suspected sensor.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion and loose wires.
Service as necessary.
• Install breakout box. Leave PCM
disconnected.
• Use following list to measure resistance
between appropriate test pins at breakout
box:
• DTC P1130, P1132=Heated oxygen
sensor (Front)
Test Pin 60 and Test Pins 71, 93 and 97.
• Is resistance greater than 10,000 ohms?
Yes
REMOVE breakout box.
REPLACE PCM.
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No REPLACE heated oxygen sensor.
SERVICE short to power.
REMOVE breakout box.
RECONNECT all components.
RESET PCM to completely clear DTCs.
u ■ After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
11
CHECK FOR HEATED OXYGEN SENSOR
SIGNAL SHORTED TO HEATED OXYGEN
SENSOR HEATER CIRCUIT IN SENSOR
• Key off.
• Connect suspected heated oxygen sensor.
• NGS tester connected.
• Key on, engine off.
Note
• Heated oxygen sensor displayed as 02S11
on NGS tester.
• Access 02S11 PID.
• Is heated oxygen sensor voltage greater
than 0.45 volt?
Yes REPLACE heated oxygen sensor.
RECONNECT all components.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No
RECONNECT all components.
Go to next step.
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