Chery A21 2005, Service Manual, Page: 336 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
13
l
Malfunction phenomena: idle speed not stable, accelerating not good, can not start, idle
speed is too high, exhaust gas exceed standard, difficult to start, air conditioner failure,
injector control failure, engine dies out etc..
l
Reasons for general malfunction: 1, ECU component was burnt down caused by
overloading of the exterior connected electrical device; 2, circuit board was rust and
erode caused by water in ECU.
l
Service notice: 1, do not disassemble ECU at random during the service; 2, disassemble
accumulator 5 minutes prior to disassemble ECU; 3, keep the disassembled ECU
carefully; 4, prohibit to connect any circuit to ECU connecting line.
l
Simple measurement method:
1
、
(connect ECU joint)Read engine malfunction record by K line.
2
、
(disassemble ECU joint)Check the connecting line of ECU, and pay more attention to
check the power supply and ground line of ECU;
3
、
Check the working conditions of exterior sensor and its output signal and its circuit;
4
、
Check actuator and its circuit;
5
、
At last change ECU and have a test.
PDF created with pdfFactory Pro trial version www.pdffactory.com