Chery A21 2005, Service Manual, Page: 353 / 475

CHERY
·
A21 SERVICE MANUAL ENGINE EFI SYSTEM
30
Blower circuit malfunction (fuse is burnt, relay
circuit is open circuit or short circuit)
Irregular pressure of air conditioner (much higher of
the high voltage or the much lower of the low
voltage)
Malfunction of evaporator temperature sensor
Air conditioner relay circuit is failure (short circuit
to ground, short circuit to power supply, open
circuit).
4 ME7 SYSTEM TEST AND REPAIR ACCORDING TO TDC
Explanation:
1. When it is confirmed that malfunction is steady we can carry out the test and repair as
below, otherwise this will cause wrong diagnosis.
2. There is multimeter mentioned below, it is referred to digital multimeter; prohibit to use
finger multimeter check the EFI system.
3. Check and repair the vehicle with anti theft system please re-program the replaced ECU
when there is the occasion of changing the ECU at
“
flow up steps
”
.
4. In this items when the TDC of P0171
、
P0172
、
P0335
、
P0336
、
P1651 existing, the engine
trouble light will not light on.
5. If it shows much lower of the voltage in some circuit in DTC explanation, it refers to
perhaps there is ground short circuit inside of this circuit; If it shows much higher of the
voltage in some circuit in DTC explanation, it refers to perhaps there is power supply
short circuit inside of this circuit; If it shows circuit failure in DTC explanation, it refers
to perhaps there is open circuit or multi circuit malfunction inside of this circuit.
Diagnosis help: 1. DTC can not be deleted; it is steady failure; if it is occasional failure,
check if it is because of the loosening of cable joint.
2. Check according to the above steps and find noting wrong;
3. During check and repair pay attention that the influence of vehicle
maintenance, cylinder pressure and mechanical ignition timing to
the system;
4. Change ECU and test it. If the DTC can be deleted, the malfunction
is inside of ECU; if the DTC can not be deleted, change back to the
original ECU and check it again according to above items.
4.1 ENGINE DTC (DIAGNOSTIC TROUBLE CODE) LIST
DTC Definition DTC Definition
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