Geely EC718 2009 Workshop Manual page 769

Engine
Step 1 Initial Inspection
Next
check oxygen sensor heater resistance.
Step 2
Yes
Measure voltage between terminal D and ground.
Step 3
Post-catalytic Oxygen Sensor Harness
Connector EO03
A
Yes
Check oxygen sensor heater control terminal Continuity.
Step 4
B C D
FE02-5358b
Control System JL4G15-D
Check the existence of following factors that will affect the oxygen
sensor working status:
(a) Exhaust system leakage or blockage.
(b) Water entering the oxygen sensor connector.
(c) Engine working at high temperatures, exhaust pipes too hot.
(a) Turn the ignition switch to "OFF" position.
(b) Disconnect the oxygen sensor wiring harness connector.
(c) Measure the oxygen sensor heater resistance.
Standard Resistance: Connectors C and D, 9 Ω/20°C(68 ºF)
(d) Connect the oxygen sensor wiring harness connector.
Is the resistance specified value?
Replace oxygen sensor. Refer to
No
Catalytic Oxygen Sensor Replacement
(a) Turn the ignition switch to "OFF" position.
(b) Disconnect the oxygen sensor wiring harness connector.
(c) Turn the ignition switch to "ON" position.
(d) Measure voltage between oxygen sensor harness connector
EO03 terminal D and ground.
Standard Voltage: 11-14 V
(e) Connect the oxygen sensor wiring harness connector EO03.
Is the voltage specified value?
Post-Catalytic oxygen sensor heater power
No
supply circuit fault.
EC718/EC718RV EC715/EC715RV 10/2009
2-687
2.4.7.1 Post-