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CHERY·A21 SERVICE MANUAL ENGINE EFI SYSTEM 63 11. Low engine speed or dying out exists when it is accelerated. General failure component: 1) water in fuel; 2) air intake pressure sensor and throttle General diagnosis flow: No. Operating steps Result Follow up steps Yes Repair the air 1 Check the air cleaner if it is jammed. No Next step Yes Next step 2 Connect the fuel pressure meter ( connecting point is the front end of fuel distributing pipe assembly fuel intake pipe); start the engine and check fuel pressure at idle speed if it is around 260kpa; take off the vacuum pipe from fuel pressure regulator check the fuel pressure if it is around 300kpa. No Repair the fuel supplying system Yes Next step 3 Check spark plugs in every cylinder and observe its type and clearance if it is accord with the regulation. No Adjust or replace Yes Clean related part 4 Disassemble idle speed regulator and check throttle valve, idle speed regulator and idle speed by pass port if there is carbon deposition. No Next step Yes Next step 5 Inspect air intake pressure sensor, throttle position sensor and its line if it is working correctly. No Repair line or replace sensor Yes Replace fault part 6 Disassemble the injector, check the injector using the injector special cleaning analysis meter and observe if it is leaking or jammed. No Next step Yes Replace fuel 7 Check fuel conditions and check if the failure is appeared after the fuel refilling No Next step Yes Next step 8 Check the engine ignition order and ignition timing if it is accord with the regulation. No Repair ignition timing Yes Next step 9 Check the exhaust pipe if the air exhausting is smooth No Repair or replace exhaust pipe Yes Diagnosis help 10 Connect EFI system adaptor, turn on the ignition switch; check the power supply of pin No.12, 13, 44, 45 and No.63 if it is in right conditions; check pin armature of No.3, 51, 53, 61 and No.80 if it is in right conditions. No Repair corresponding line
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