Chery Tiggo 5 (T21). Service manual — part 5

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5. Load test

Malfunction occurs only when electrical device is turned
on. Turn on the electrical equipment (A/C, rear window
defogger, radio, fog light, etc.) one by one and determine
the relationship between electrical equipment and
malfunction. Confirm the malfunction by a load test.

6. Cold/hot start test

Some malfunctions occur in cold start and disappear when engine warms up. In this case, park vehicle
without operation for a whole night and restart it the next day. Perform test and determine the cause
quickly.

7. Voltage drop test

Generally, the voltage drop test is used to find out the possible causes that affect the normal function of
electrical components or circuits.
Check the circuit with a digital multimeter.
If resistance of single wire harness measured by a digital multimeter is very low (0 Ω or close to 0 Ω), the
wire harness or circuit is normal.
The unnecessary resistance in circuit may be caused by poor, loose grounding, corrosive switch contact
and loose wire connector or adapter.

Precautions for Control Module and Electrical Components
Inspection

 Before performing electrical operations, turn ignition

switch to LOCK and disconnect the negative battery
cable, then wait for 2 minutes until the backup power
supply of airbag module is depleted (w/ airbag system).

 Disconnecting the battery cable will delete the clock, audio and DTC records. Therefore, it is necessary to

confirm these records before disconnecting the cable.

 Never connect the electrodes of battery terminals reversely.
 Only install components that meet the vehicle specifications.
1. Inspect input and output conditions of components and their functions before replacing control module.

 When disconnecting components:

- Do not use excessive force when disconnecting connector.
- If connector is installed by tightening bolt, loosen mounting bolt and then disconnect the connector

by hand.

 When connecting components:

- Make sure that terminals are not bent or damaged, and then connect it correctly before installing

connector.

RT21020190

RT21020200

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- Tighten the mounting bolt until the painted area of connector is flush with the surface when installing

connector by tightening bolt.

 Never drop or hit the control module to prevent excessive impact.
 Note that the condensation is not formed on control module due to extreme change of temperature and

keep it free from water drop or rain. If water is found on the control module, dry it thoroughly and then
install it to vehicle.

 Be careful not to allow fluid to adhere to the control module connector.
 Avoid cleaning the control module with volatile fluid.
 When using digital multimeter, be careful not to get

the testing probes to contact with each other to result
in a short circuit. Avoid damaging the battery due to
short circuit in power transistor inside the control
module.

 Use specified test adapter to check the input and output signals of control module.

2. Check fuse

 Check that fuse wire is connected.

 If fuse wire is blown, confirm that there is no short in the circuit.
 A fuse with the same rated amperage must be used for replacing.

RT21020210

V

RT21020220

Good

Blown

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How to Check Connector

Many electrical malfunctions are caused by electrical
connections or wire malfunctions, and also may be caused
by the bonding of components or relays. Before determining
if malfunction is caused by components or wire harness
assembly, check if connection of connectors is good.

1. Check connector with a digital multimeter

 Damaged connectors and poor connections are caused by incorrect connector detection during the

circuit inspection.

 The probe of digital multimeter may be connected incorrectly with the socket of connector. To detect the

connector correctly, use a "T" shaped pin and follow the procedures below. To obtain optimal
connection, clamp the "T" shaped needle with a spring clamp.
a. Detect from wire harness side

- If there is a back cover for connector, remove the back cover before detecting terminal.
- Do not detect the water-proof connector from the wire harness side. Failure to do this may

damage the seal between wire harness and connector.

b. Detect from terminal side

- Female terminal:

Do not insert any object that is bigger than male terminal into the female connector.

- Male terminal:

Carefully detect the contact surfaces of each terminal with a "T" shaped needle. Do not bend the
terminal.

2. Check terminal contact spring for proper tension

 The contact spring on terminal may produce intermittent signals in the circuit.
 If intermittent open circuit occurs, follow the procedures below to check open wire harness and contact

spring on the female terminal.
- Use a male terminal matched with female terminal.
- Disconnect the suspected defective connector and secure the terminal side upward.
- When securing the wire harness of male terminal, try to insert the male terminal into female terminal.
- Move connector and check if male terminal can be inserted easily.

HINT:
If male terminal can be inserted into female terminal easily, replace the female terminal.

RT21020230

Terminal
Deformation

Crimping Looseness

Slightly Pull

Cord Wire

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CIRCUIT INFORMATION

How to Read Circuit Diagram

1. Connector symbols

 Most of the connector symbols in circuit diagrams

indicate the terminal side.

 The terminal side view in circuit diagram is shown at

the bottom of circuit diagram.

2. Option splices

Option splice is indicated by diamonds (solid line), and marked with pin number inside.

RT21020240

Terminal Side

Harness Side

RT21020250

Female

Connector

Connector Symbol

RT21020260

4

8

15

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MANUAL TRANSMISSION

AUTO TRANSMISSION

E-106

CONTROL
UNIT

E-106

E-106

E-106

E-106

E-106

CONTROL
UNIT

E-106

SENSOR

E-106

SENSOR