Geely EC718 2009 Workshop Manual page 205

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Engine
Yes
Diagnostic completed.
Step 17
5. Repair Instructions:
Replace post-catalytic oxygen sensor. Refer to
2.2.7.23 DTC P0170 P0171 P0172 P2177 P2178 P2187 P2188
1. DTC Descriptor:
DTC
P0170
DTC
P0171
DTC
P0172
DTC
P2177
DTC
P2178
DTC
P2187
DTC
P2188
Engine Control Module (ECM) controls the close-loop Air-Fuel ratio Measure system that achieves optimal combination of
performance, fuel economy and emissions control. In the close-loop mode, the engine control module monitors heated oxygen
sensor (HO
S) signal voltage and adjusts fuel supply according to the signal. Changes in fuel supply will change the value of long-
2
term and short-term fuel supply adjustment. Short-term fuel supply adjustment will respond to heated oxygen sensor signal voltage
and rapidly change. These changes will fine tune the fuel supply. Long-term fuel supply adjustment will respond to the trend in short-
term fuel supply adjustment. Long-term fuel adjustment adjusts the fuel supply in order to return to the center of the short-term fuel
adjustment value and controls the short-term fuel adjustment. The ideal fuel adjustment value is around 0%. A positive value indicates
that engine control module is increasing fuel supply to compensate the lean Air-Fuel mixture. A negative value indicates that engine
control module is decreasing fuel supply to compensate the rich Air-Fuel mixture.
2.4.7.1 Post-Catalytic Oxygen Sensor
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Unreasonable
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Too Lean
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Too Rich
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Higher Than Maximum
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Lower Than Minimum
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Higher Than Maximum
(Low-Load Zone)
Close-Loop Control Down Stream Air-Fuel Ratio Self Learn Value Lower Than Minimum
(Low-Load Zone)
Control System JL4G18-D
(f)
Read control system DTC code again to confirm that the
system has no DTC code.
Intermittent Fault. Refer to
No
Fault Check
Replacement.
EC718/EC718RV EC715/EC715RV 10/2009
2-123
2.2.7.3 Intermittent

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Ec715rv 2009Ec718rv 2009Ec715 2009

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