Geely EC718 2009 Workshop Manual page 821

Engine
2. Conditions For Setting DTC and The Fault Location:
DTC Code DTC Detection Strategy
P0420 Hardware Circuit Checks
3. Schematic:
Refer to 2.2.6.1 Schematic
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.
Check whether there are control system DTC codes other than DTC P0420.
Step 1
Yes
Start engine and turn on the scan tool.
Step 2
Next
Keep the engine speed at 2,500 rpm for more than 2 min to warm up the engine, until the engine coolant
Step 3
temperature reaches 80°C (176 ºF).
Control System JL4G15-D
Conditions For Setting The DTC
(Control Strategy)
Coolant temperature is higher than
70°C (158 ºF), and the fuel system is
in close-loop mode. After driving
some distance and stop the vehicle,
run the engine at idle, the system
compares the Pre-Catalytic and
Post-Catalytic oxygen sensor
signals to calculate three-way
catalyst converter oxygen storing
time. When the oxygen storing time
is less than the threshold, the system
reports a fault.
(a) Connect scan tool to the datalink connector.
(b) Turn the ignition switch to "ON" position.
(c) Press the scan tool power button.
(d) Select the following menu items: Engine/Read DTC codes.
(e) Read DTC code
DTC Codes Shown
DTC P0420
DTC Code Other Than DTC P0420
No
EC718/EC718RV EC715/EC715RV 10/2009
Fault Locations
1. Pre-Catalytic Oxygen Sensor
2. Post-Catalytic Oxygen Sensor
3. Three-Way Catalytic Converter
4. Exhaust Leak
Refer to 2.12.7.14 DTC Code
2-739
To Step
Yes
No
Index.