•
Inspect whether the sensor voltage data is changed
significantly, as the signal voltage will increase rapidly.
Pre-Catalytic
Oxygen Sensor
Signal Voltage
Post-Catalytic Oxygen
Sensor Signal Voltage
To Step
Obvious Change
No Change
A
No Change
Obvious Change
B
Obvious Change
No Change
C
No Change
No Change
D
B
Replace the pre-catalytic oxygen sensor.
Refer to
.
C
D
Check the cause for engine air-fuel ratio too
lean/too rich. Refer to
A
Step 7
Check whether there is exhaust leakage.
Yes
Repair the faulty part. Go to step 11
No
Step 8
Replace the three-way catalytic converter. Refer to
Three-way Catalytic Converter Replacement
Next
Step 9
Check whether there is exhaust leakage.
Yes
Repair the faulty part. Go to step 11
No
Step 10
Replace the post-catalytic oxygen sensor. Refer to
Post-Catalytic Oxygen Sensor Replacement
Next
Step 11
Use scan tool to confirm whether the DTC code is stored again.
(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.
Engine
Control System JL4G15-D
2-741
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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