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12. Steps for Implementation of Failure Diagnosis by Engine Symptom 12.1 Perform Preliminary Inspection First before Following the Steps for (1) Make sure that ECU and failure indicator lamp (or EPC lamp) have no off-normal
Name Parameter Air intake temperature
20-70℃
Battery voltage
12-14V (affected by engine revolution)
Temperature of engine coolant
80-90 (normal operating temperature) ℃
Position of accelerator pedal
0%~99.00%
Air-fuel ratio control integrator
5%-5%
Ignition advance angle
5-10 ° ( may change with fluctuation of engine revolution)
Outer corner of throttle
0%~99.61%
Fuel injection time
2-7ms (has a strong relation with engine
Engine revolution n
Expected idle speed ± 50rpm
Duty cycle of canister control valve
0%~99.9%
Self-adapting value of air-fuel ratio
0.95-1.05
Self-adapting value of air-fuel ratio
120-140
Intake manifold absolute pressure
350-650hPa
Voltage of oxygen sensor
Quickly fluctuates at 0.1-0.9V
Air intake pressure
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