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Engine
A
Check whether there is exhaust leakage.
Step 7
No
Step 8
Replace the three-way catalytic converter. Refer to
Check whether there is exhaust leakage.
Step 9
No
Replace the post-catalytic oxygen sensor. Refer to
Step 10
Next
Use scan tool to confirm whether the DTC code is stored again.
Step 11
Control System JL4G15-D
•
Inspect whether the sensor voltage data is changed
significantly, as the signal voltage will increase rapidly.
Pre-Catalytic
Post-Catalytic Oxygen
Oxygen Sensor
Sensor Signal Voltage
Signal Voltage
Obvious Change
No Change
No Change
Obvious Change
Obvious Change
No Change
No Change
No Change
Replace the pre-catalytic oxygen sensor.
B
Refer to
Replacement.
Go to step 9
C
Check the cause for engine air-fuel ratio too
D
lean/too rich. Refer to
Table
Repair the faulty part. Go to step 11
Yes
2.7.6.2 Three-way Catalytic Converter
Go to step 11
Next
Repair the faulty part. Go to step 11
Yes
2.4.7.1 Post-Catalytic Oxygen Sensor
(a)
Connect scan tool to the datalink connector.
(b)
Turn the ignition switch to "ON" position.
(c)
Clear DTC code.
(d)
Start and run the engine at idle speed to warm up the engine
for at least 5 min.
(e)
Road test the vehicle for at least 10 min.
EC718/EC718RV EC715/EC715RV 10/2009
To Step
2.4.7.2 Pre-Catalytic Oxygen Sensor
2.12.7.4 Symptoms
Replacement.
Replacement.
2-741
A
B
C
D
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