Geely EC718 2009 Workshop Manual page 759

Engine
Yes
Diagnostic completed.
Step 16
5. Repair Instructions:
Replace the pre-catalytic oxygen sensor. Refer to
2.12.7.23 DTC P0135
1. DTC Descriptor:
DTC
Upstream Heated Oxygen Sensor (HO
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.
Pre-Catalytic oxygen sensor heating coil voltage is provided by The Main Relay controlled by ECM, when the ignition switch is turned
to "ON", EO02 sensor harness connector terminal D will have battery voltage. ECM controls heater working hours through ECM
harness connector EO01 terminal No.14.
2. Conditions For Setting DTC and The Fault Location:
DTC Code DTC Detection Strategy
P0135 Hardware Circuit Checks
3. Schematic:
Refer to 2.12.7.22 DTC P0131 P0132 P0133
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.
Initial Inspection
Step 1
2.4.7.2 Pre-Catalytic Oxygen Sensor
P0135 Pre-Catalytic Oxygen Sensor Heater Malfunction
S) is used for fuel control. The sensor compares the oxygen content in ambient air and
2
Conditions For Setting The DTC (Control
1. Engine Running Longer Than 60 s.
2. At idle Running Condition.
3. Pre-Catalytic Oxygen Sensor Heating
4. Pre-Catalytic Oxygen Sensor Heating
Control Terminal Disconnected.
5. Duration Less Than 20 s.
P0134.
Control System JL4G15-D
(f) Read control system DTC code again to confirm that the
system has no DTC code.
Intermittent Fault. Refer to
No
Fault Check
Replacement.
Strategy)
EC718/EC718RV EC715/EC715RV 10/2009
2-677
2.2.7.3 Intermittent
Fault Locations
1. Sensor Circuit
2. Sensor
3. ECM