Geely EC718 2009 Workshop Manual page 201

Engine
No
Test the oxygen sensor signal.
Step 6
No
Check whether there are other control system DTC codes.
Step 7
Control System JL4G18-D
Intermittent Fault. Refer to
Yes
Fault Check
(a) If the voltage data is consistently below 0.45 V (mixture too
lean), carry out steps as following:
• Spray proper amount of propane gas into the intake.
• Check whether the Post-Catalytic oxygen sensor voltage
data has a significant change, as it will cause signal
voltage rise rapidly.
(b) If the voltage data is consistently above 0.45 V (mixture too
rich), carry out steps as following:
• Put gear into Neutral.
• Apply hand brake.
• Press the accelerator pedal so that the engine speed
suddenly increases to 4,000 rpm and then quickly release
the accelerator pedal.
• Repeat the previous step more than 3 times.
• Check whether the Post-Catalytic oxygen sensor voltage
data has a significant change, as it will cause signal
voltage decrease rapidly.
During the test, the oxygen sensor signal voltage should have
significant changes.
Does voltage have a significant change?
Check the cause for engine Air-Fuel ratio too
Yes
lean/too rich. Refer to
Table.
(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 codes.
Results:
DTC Codes Shown
DTC code other than P0136, P0137, P0138,
P0140, P2270, P2271DTC, P0136, P0137,
P0138, P0140, P2270, P2271
EC718/EC718RV EC715/EC715RV 10/2009
2-119
2.2.7.3 Intermittent
2.2.7.4 Fault Symptom
To Step
No