Geely EC718 2009 Workshop Manual page 764

2-682 Control System JL4G15-D
Next
Observe oxygen sensor output voltage, which should be within 0.6-0.7 V.
Step 4
No
Step 5 Carry out the oxygen sensor signal test.
No
Confirm no other control system DTC code.
Step 6
EC718/EC718RV EC715/EC715RV 10/2009
Intermittent Fault. Refer to
Yes
Fault Check
(a) If the data is consistently below 0.45 V (mixture too lean),
carry out the following steps:
• Spray proper amount propane gas into intake.
• Observe whether the Post-Catalytic oxygen sensor
voltage has a significant change, as the signal voltage will
increase rapidly.
(b) If the data is consistently higher than 0.45 V (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 increases to 4,000 rpm and then quickly release
the acceleration pedal.
• Repeat the previous step more than 3 times.
• Observe whether the Post-Catalytic oxygen sensor
voltage has a significant change, as the signal voltage will
decrease 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 Air-Fuel ratio too thin /
Yes
too rich. Refer to
(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 codes other than P0137, P0138, P0140
P0137, P0138, P0140
Engine
2.2.7.3 Intermittent
2.12.7.4 Symptoms Table.
To Step
No
Yes