Chery T21 2014 Service Manual page 373

Engine Problem Symptom Diagnosis
Perform primary inspection first before performing malfunction diagnosis procedures:
1. Confirm that engine malfunction indicator operates normally;
2. Using diagnostic tester, check that no error messages are recorded;
3. Confirm that malfunction complained by customer is present, and confirm the condition under which the
malfunction occurs.
Then, perform appearance inspection:
1. Check fuel line for leakage;
2. Check if vacuum line is broken or twisted, and if connection is correct;
3. Check intake line for blockage, air leakage, crush or damage;
4. Check if high-voltage cable of ignition system is broken or deteriorated, and if ignition sequence is correct;
5. Check if wire harness ground points are clean and secure;
6. Check each sensor or actuator connector for looseness or poor contact.
HINT:
If above conditions exist, repair the trouble areas first. Otherwise, it will affect the repair work for the following
trouble diagnosis.
Diagnostic Help
1. Confirm that there are no trouble records for engine;
2. Confirm that complained trouble symptoms are present;
3. There are no abnormal conditions after performing the inspection according to above procedures;
4. During servicing, do not ignore vehicle maintenance condition, cylinder pressure, mechanical ignition
timing and fuel condition, etc. that can affect the system;
5. Replace ECM, and perform a test. If the trouble can be eliminated, the trouble area is in ECM; if the trouble
symptom still exists, reuse the original ECM, repeat the procedures, and perform service again.
Problem Symptoms Table
Symptom
Engine does not crank or cranks slowly
while starting
Engine cranks normally but cannot start
successfully while starting
Difficult to start with hot engine
Chery Automobile Co., Ltd.
06 - SQR484F ENGINE MANAGEMENT SYSTEM
Suspected Area
Battery
Starter motor
Wire harness or ignition switch
Engine mechanical
No fuel in tank
Fuel pump
Engine speed sensor
Ignition coil
Engine mechanical
Water in fuel
Fuel pump
Coolant temperature sensor
Fuel pressure regulator
Ignition coil
SQR484F ENGINE MANAGEMENT SYSTEM
06
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