3. Schematic:
12
13
From Battery
Main Relay
Pre-catalytic Oxygen Sensor
To Post-catalytic Oxygen Sensor
Engine
Control
Module
FE02-5008b
4. Diagnostic Steps:
Note
Before carrying out this diagnosis step, observe the data list on scan tool and analyze the accuracy of the data, as
these will help with quick diagnosis.
Step 1
Initial inspection.
Check the existence of following factors that will affect the heated
oxygen sensor working status:
(a)
Exhaust system leaks or blockage.
(b)
Water entering into the heated oxygen sensor connector.
(c)
After engine working in high temperatures, whether exhaust
pipes are too hot.
Next
Step 2
Check the Pre-Catalytic oxygen sensor heater resistance.
2-80
Control System JL4G18-D
Engine
EC718/EC718RV EC715/EC715RV 10/2009
Summary of Contents for EC715 2009
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