Geely EC718 2009 Workshop Manual page 768

2-686 Control System JL4G15-D
Yes
Diagnostic completed.
Step 16
5. Repair Instructions:
Replace the Post-Catalytic oxygen sensor. Refer to
2.12.7.25 DTC P0141
1. DTC Descriptor:
DTC
Heated Post-Catalytic Oxygen Sensor (HO
compares the oxygen content in ambient air and oxygen content in the exhaust flow. Each heated oxygen sensor has an internal
heating element. ECM controls the heated oxygen sensor heating control circuit. This makes the system enter the closed-loop system
earlier, so that ECM will calculate Air-Fuel ratio earlier. ECM controls the heating control circuit switched on or off, so that heated
oxygen sensor working temperature maintains in the specified range. ECM measures the heater current to determine the
temperature.
The Post-Catalytic oxygen sensor heating coil voltage is provided by The Main Relay controlled by ECM. When the ignition switch
is turned to "ON", Post-Catalytic oxygen sensor connector EO03 terminal D will have battery voltage. ECM controls the heater
working hours by ECM harness connector EO01 terminal No.46.
2. Conditions For Setting DTC and The Fault Location:
DTC Detection
DTC Code
Strategy
Hardware Circuit
P0141
Checks
3. Schematic:
Refer to 2.12.7.24 DTC P0137 P0138
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.
EC718/EC718RV EC715/EC715RV 10/2009
2.4.7.1 Post-Catalytic Oxygen Sensor
P0141 Post-Catalytic oxygen sensor heater malfunction
S) is used to monitor the three-way catalytic converter working status. The sensor
2
Conditions For Setting The DTC (Control Strategy)
1. Engine Running Longer Than 60 s.
2. Idle Running Condition.
3. Post-Catalytic Oxygen Sensor Heating.
4. Post-Catalytic Oxygen Sensor Heating Control Terminal
Circuit Open.
5. Duration Less Than 20 s.
P0140.
(e) Road test the vehicle for at least 10 min.
(f) Read control system DTC code again to confirm that the
system has no DTC code.
Intermittent Fault. Refer to
No
Fault Check
Replacement.
Engine
2.2.7.3 Intermittent
Fault Locations
1. Sensor Circuit
2. Sensor
3. ECM