Geely EC718 2009 Workshop Manual page 755

Engine
No
Carry out the oxygen sensor signal test.
Step 6
No
Check and confirm there is no other control system DTC code.
Step 7
Control System JL4G15-D
Intermittent Fault. Refer to
Yes
Fault Check
(a) If the voltage is consistently below 0.45 V (mixture too lean),
carry out the following steps:
• Spray proper amount propane gas into intake.
• Observe whether the Pre-Catalytic oxygen sensor
voltage has a significant change, so the voltage will rise
rapidly.
(b) If the voltage is always higher than 0.45 V (the mixture too
rich), carry out the following steps:
• Put the gear into neutral.
• Apply hand brake.
• Press the acceleration pedal so the engine speed
suddenly increased to 4,000 rpm and then quickly release
the acceleration pedal.
• Repeat the previous step more than 3 times.
• Check whether the Pre-Catalytic oxygen sensor voltage
has a significant change, so the voltage will rise rapidly.
During the above test, the oxygen sensor signal voltage should
have a significant change.
Does the voltage have a significant change?
Check the cause for engine Air-Fuel ratio too
Yes
thin / 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 other than P0131, P0133, P0134
P0131, P0133, P0134
Refer to
No
EC718/EC718RV EC715/EC715RV 10/2009
2.2.7.3 Intermittent
2.12.7.4 Symptoms
To Step
No
Yes
2.12.7.14 DTC Code Index
2-673