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Chery T11 Service Manual Electric Injection System 73
6) Unstable idle at any time
No. Operation Step Detection Result Subsequent Step 1 Place the ignition switch on the “ON” position, and apply the failure diagnosis instrument to examine and confirm whether there are some failure information records. Yes Remove the displayed failure No Next step 2 Examine and confirm whether the stepper motor idle actuator is seized. Yes Repair or replace the idle actuator No Next step 3 Turn on the ignition switch, and examine and confirm whether the connecting wires among the water temperature sensor, idle stepper motor and ECU are normal. Yes Examine harness and connecting parts No Next step 4 Enable the engine to operate at idle speed, shut down these cylinders one by one, and view whether the engine speed decreases and fluctuates. Yes 8 No Next step 5 Examine and confirm whether the operating condition of fuel injector of any cylinder is normal. Yes Next step No Examine the fuel injector and harness 6 Examine and confirm whether the resistance value of high-voltage wire of any cylinder is normal. Yes Next step No Replace 7 Examine and confirm whether the ignition switch is damaged. Yes Replace No Next step 8 Examine and confirm whether the sparkle plug is normal. Yes Next step No Replace sparkle plug 9 Connect the fuel pressure gage valve. Short circuit the No 30 and 87 pins of fuel pump relay to enable the fuel pump relay and fuel pump to operate. Examine and confirm whether the fuel pressure is approx. 350 kPa. Yes Next step No 13 10 Apply the special connecting terminal to directly supply the fuel injector 12 V voltage from the battery, and examine the normal operation of fuel injector. Yes 12 No Next step 11 Rinse the fuel injector, and then reexamine the normal operation of fuel injector. Yes Next step No Replace the fuel injector 12 Examine and confirm whether the fuel deteriorates or contains water. Yes Replace fuel No 18 13 Examine and confirm whether the fuel pressure is less than 350 Yes Next step |