Geely EC718 2009 Workshop Manual page 194

2-112 Control System JL4G18-D
No
Test the oxygen sensor signal.
Step 6
No
Check and confirm no other control system DTC codes.
Step 7
EC718/EC718RV EC715/EC715RV 10/2009
Intermittent Fault. Refer to
Yes
Fault Check
(a) If the voltage data is consistently below 0.45 V (mixture too
lean), then carry out inspection steps as following:
• Spray proper amount of propane gas into the intake port.
• Inspect whether the pre-catalytic oxygen sensor voltage
data has a significant change, in which case the signal
voltage will increase rapidly.
(b) If the voltage data is consistently higher than 0.45 V (mixture
too rich), then carry out inspection steps as following:
• Put gear into Neutral.
• Apply hand brake.
• Press the accelerator pedal so the engine speed
suddenly increases to 4,000 rpm and then quickly release
the accelerator pedal.
• Repeat the previous steps more than 3 times.
• Inspect whether the pre-catalytic oxygen sensor voltage
data has a significant change, in which case the signal
voltage will decrease rapidly.
During the above test, the pre-catalytic oxygen sensor signal
voltage should change significantly.
Is voltage changed significantly?
Inspect the cause for engine air-fuel ratio too
Yes
lean/too rich. Refer to
Table.
(a) Connect scan tool to a 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 codes other than P0030, P0031, P0032,
P0053
P0030, P0031, P0032, P0053
Refer to
No
2.2.7.3 Intermittent
2.2.7.4 Fault Symptom
To Step
No
Yes
2.2.7.11 DTC Code Index
Engine