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12.17 When Releasing Accelerator Pedal after Acceleration, Unsteady Idle Speed Occurs at Instant, even Extinguishes.
Yes Remove the failure displayed 1 Put the ignition switch to “ON”. Use a failure diagnostic tester to check if any failure information record exists. No Next step Yes Next step 2 With engine off, check if air cleaner is smooth (can not simply rely on visualization, remove the air cleaner and then perform test drive again) and if air intake system is chocked. No Replace Yes Next step 3 Run the engine at idle speed and check if the engine revolution speed is normal at idle speed. No Repair in accordance with idle speed failure item Yes Next step 4 After starting successfully, check if air intake consumption of the engine at idle speed is around 300Kg/h (remember to check if cylinder pressure is normal). No Overhaul Yes Next step 5 Put the ignition switch to “ON”. Check if it is break or short circuit between 38#, 32#, 54#, 36# pins on ECU connector and 1#, 2#, 4#, 6# pins of throttle position sensor of electronic throttle valve body. No Repair or replace Harness
Yes Next step 6 Let engine run at idle speed, after coolant temperature reaches normal value, then use a diagnostic tester to check if ignition advance angle is normal. No Check other part Yes Next step 7 Connect fuel manometer valve. Short 30# and 87# pins of fuel pump relay to make the fuel pump run, and then check if fuel pressure is around 400kPa. No 11 Yes Clear carbon deposit 8 Remove air intake hose, check if carbon deposit or other soil (this may result in air intake system of engine being chocked when the valve plate closes) exists. No Next step Yes Next step 9 Clean out the fuel injector and look if it can work correctly.
No Replace fuel injector Yes Replace fuel 10 Check if fuel is deteroprated or moisture.
No 16 11 Yes Next step |