Epica automobile engine fault indicator lit irregular

Symptom: a 07 two.0L fgtech galletto v54 Chevrolet New Epica sedan, traveling 23,000 km, clients occasionally mirror abnormal motor fault lights lit.
Inspection and evaluation: The fault code retrieval TECH2 into powertrain handle module (PCM), turned up the fault code P0171-fuel upa-usb trim procedure much too lean, the historic fault codes. Check out the information flow motor process, discovered over the 1st oxygen sensor (upstream oxygen sensor) small signal value fluctuations, fluctuations within the sluggish a hundred mV-150 mV, and from time to time usually do not move (usual variation should be retained in OmV-900mV), ie one, the oxygen sensor output voltage is just not ordinary. Verify that the sensor wire connector, identified no abnormalities, the initial perseverance around the 1st oxygen sensor is defective. After replacing the 1st oxygen sensor, the sign info is still not typical, the trouble is not within the set within the sensor.
Due to some fault code signifies that the gasoline adjustment system as well lean, then check regardless of whether the throttle valve as well as ingestion manifold camp leakage phenomenon. With carburetor cleaner on the throttle and intake manifold areas of the test, when sprayed into x431 diagun the throttle position when the pad and found the oxygen sensor sign value alterations considerably, analyzing the throttle pad leaks, therefore the throttle overall body split Future, test the throttle pad, with no exception. Just after loading exam, the oxygen sensor signal benefit is just not ordinary.
When dismantling the throttle entire body, consumption manifold discovered there are actually additional liquid substances and coke. Test the information consumption manifold absolute force (MAP) sensor, when no air conditioning to twenty-eight kPa, once the air con is 36 kPa, ninety eight kPa case was vain device, underneath ck100 typical situations, when no air conditioning to 32 kPa, when air-con is 45 kPa, when vain equipment is 102 kPa (ie, atmospheric tension). Take away the intake manifold absolute strain sensor camp and located the sensor vent is clogged grime and coke, clean up the sensor as well as ingestion manifold exam and check the motor program with TECH 2 info stream display screen thoroughly.
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