Geely EC718 2009 Workshop Manual page 204

2-122 Control System JL4G18-D
Step 13 Check oxygen sensor ground circuit.
Post-Catalytic Oxygen Sensor
Harness Connector EN03
4
ECM Harness Connector EN01
64 63 62
61 60 59 58 57
50 49 48 47 46 45 44 43
36 35 34 33 32 31 30 29
22 21 20 19 18 17 16 15
Next
Check ECM power supply circuit.
Step 14
Yes
Replace ECM.
Step 15
Next
Use scan tool to confirm whether the DTC code is stored again.
Step 16
EC718/EC718RV EC715/EC715RV 10/2009
3 2 1
56 55 54 53 52 51
8 7
6
5
42 41 40 39 38 37
28 27 26 25 24 23
3
4
2 1
9
14 13 12 11 10
FE02-5050b
(a) Turn the ignition switch to "OFF" position.
(b) Disconnect the oxygen sensor wiring harness connector
EN03.
(c) Disconnect ECM harness connector EN01.
(d) Measure resistance between post-catalytic oxygen sensor
wiring harness connector EN03 terminal No.3 and ECM
harness connector terminal No.39. Check whether the circuit
is open. If there is no open circuit, repair the faulty part.
(e) Measure resistance between post-catalytic oxygen sensor
wiring harness connector EN03 terminal No.3 and a reliable
ground. Check whether the circuit is short to ground. If there
is no short circuit, repair the faulty part.
(f) Measure voltage between post-catalytic oxygen sensor
wiring harness connector EN03 terminal No.3 and a reliable
ground. Check whether the circuit is short to power supply. If
there is no short circuit, repair the faulty part.
Test Items
Resistance Between EN03 (3) and EN01 (39)
Resistance Between EN03 (3) and a Reliable
Ground
Voltage Between EN03 (3) and a Reliable
Ground
Execute next step as per normal.
(a) Check whether ECM power supply circuit is normal.
(b) Check whether ECM ground circuit is normal.
Repair the faulty part.
No
(a) Connect scan tool to the datalink connector.
(b) Turn the ignition switch to "ON" position.
(c) Clear DTC code.
(d) Start and run the engine at idle speed to warm up the engine
for at least 5 min.
(e) Road test the vehicle for at least 10 min.
Engine
Standard Value
Less than 1 Ω
10 kΩ or higher
0 V