Chery T21 2014 Service Manual page 393

Engine starts normally, but idles roughly or stalls with part load (for example,
A/C is ON)
Diagnosis Procedure
1
Check throttle for carbon deposits
Clean throttle
NG
Observe if engine output increases when A/C is turned on. This means that observe
2
changes of ignition advance angle, injection pulse width and intake air volume using
diagnostic tester
Go to step 4
OK
Connect ECM adapter, and disconnect pin cable of ECM corresponding terminal. Check if
3
wire harness side is HIGH-level signal with A/C ON
Check and repair A/C system
NG
Check if A/C system pressure, compressor magnetic clutch and A/C compressor pump are
4
normal
Check and repair A/C system
NG
5
Check injector for leakage or blockage
Clean or replace injector
NG
Chery Automobile Co., Ltd.
06 - SQR484F ENGINE MANAGEMENT SYSTEM
OK
06
NG
OK
OK
OK
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