Chery T21 2014 Service Manual page 24

02 - INTRODUCTION
c. Engine compartment
 There are many reasons for the electrical malfunction that occurred due to vehicle vibration, and it is
necessary to check the following conditions:
- Connectors are not installed correctly.
- Wire harness is not long enough, so it is extended when engine is vibrating or shaking.
- Wire harness hangs over the bracket or movable components.
- Ground wire is loose, dirty or corrosive.
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- Wire harness is too close to the high temperature components.
 To inspect the components under the engine hood, first confirm that the ground connection is in
perfect condition (refer to the grounding inspection described below). First confirm that the system is
correctly grounded. Then slightly vibrate the wire harness or components as previously instructed to
check if the connection is loose. Refer to the circuit diagram to check the continuity of wire harness.
d. Backside of instrument panel
 Improper wire clamping will cause the wire harnesses to be entangled when installing accessories.
The vibration of vehicle will cause the wire harnesses near the bracket or mounting screw to wind
excessively.
 When vehicle vibrates, unclamped or loose wire harness will be stuck in the seat components (such
as slide guide). When wire harness passes through the underside of mounting area, check if it is
damaged or stuck.
2. Thermosensitive test
In hot weather or after the vehicle is parked for a short time, the user may worry about the vehicle
condition. At this time, it is necessary to perform thermosensitive test.
Perform test by heating components with a heat gun or equivalent.
CAUTION
 DO NOT heat components to a temperature higher than 60°C (140°F).
 Perform test by heating components with a heat gun or equivalent.
3. Freezing test
If malfunction disappears after warming up the vehicle in winter, it may be caused by freeze of some parts
in the wire harness/electrical system. Use the following two methods to check this condition:
Method 1: Put vehicle outdoors overnight. Make sure that the temperature is low enough to duplicate the
malfunction. Perform a quick and thorough diagnosis on the component that may be affected in the
morning.
Method 2: Put suspected part in refrigerating room and wait until it is frozen. Reinstall the component to
vehicle and check if malfunction reoccurs. If malfunction occurs, repair or replace the component.
4. Leakage test
Malfunction may occur only during high humidity or in
rainy or snowy weather. In this case, malfunction may
occur due to water entering electrical parts. Leakage can
be checked by spraying water to vehicle (similar to car
wash).
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Chery Automobile Co., Ltd.
RT21020180