Typical Failure Diagnosis Flow; The Engine Does Not Rotate Or Rotate Slowly When It Is Started - Chery A21 2005 Service Manual

CHERY·A21 SERVICE MANUAL

5.2 TYPICAL FAILURE DIAGNOSIS FLOW

1. The engine does not rotate or rotate slowly when it is started

The normal failure component: 1) accumulator; 2) starting motor; 3) cable or ignition
switch; 4) mechanical part of the engine.
The general diagnosis flow:
No.
Check the voltage value between the two wiring terminals
1 of the accumulator by multimeter; check if it is around
Put the ignition switch at start position, checking the anode
2 terminal of starting motor by multimeter and observe the
Disassemble the starting motor and check its working
3 conditions. Check if there is open circuit or jammed by
If the failure is happened in winter time, check if it is
4
because of the wrong engine lubricant and gearbox oil
Check the mechanical resistance inside of the engine if it is
5 too big causes the starting motor can not rotate or rotate
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2 Confirm that the failure exists before the customer complaints;
3 Inspect the engine according to the above steps and find nothing wrong;
4 During the service please do not ignore the influence from vehicle
maintenance, cylinder pressure, mechanical ignition timing and fuel
conditions;
5 Replace ECU and carry out test. If the failure is deleted, the failure is in
ECU; if the failure can not be deleted, replace back to the original ECU and
repeat the flow and check and repair it again.
Operating steps
8-12V when the engine is starting.
voltage if it is above 8V.
poor lubricating.
causes the big resistance of the starting motor.
slowly.
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ENGINE EFI SYSTEM
Result Follow up steps
Yes Next step
Replace
No
accumulator
Yes Next step
Repair or
No
replace cable
Repair or
Yes replace starting
motor
No Next step
Change to
Yes correct
lubricant
No Next step
Repair the
Yes engine inside
resistance
Repeat the
No
above steps