Chery Tiggo 5 (T21). Service manual - part 216

18–

53

18

DTC Confirmation Procedure:

Confirm that battery voltage is between 11 and 14 V before performing the following procedures.
 Turn ignition switch to LOCK.
 Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC), and make it 

communicate with vehicle electronic module by the data network.

 Turn ignition switch to ON.
 Using X-431 3G diagnostic tester to record and clear the DTCs stored in the TCU.
 Turn ignition switch to LOCK and wait for a few seconds.
 Turn ignition switch to ON, and then select "Read Code".
 If DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
 If DTC is not detected, the malfunction indicated by the DTC is intermittent. Please refer to Intermittent 

DTC Troubleshooting.

Diagnosis Procedure

HINT:
After the fault is eliminated, verify DTC and symptom again.

a. Turn ignition switch to LOCK.
b. Disconnect the secondary speed sensor connector.
c. Check if the secondary speed sensor connector is dirty, oxidized, loose or damaged.

DTC Code

DTC Definition

DTC Detection 

Condition

DTC Set 

Condition

Possible Cause

P0720

Output Speed Sensor 
Circuit

Start engine and keep 
it at following status for 
at least 1 min: throttle 
opening not less than 
10%, at D gear, engine 
speed higher than 800 
rpm

Output speed 
signal is higher 
than the 
allowable value 
within a period

 Incorrect 

installation of the 
output speed 
sensor

 Signal circuit open 

or short circuit

 Output speed 

sensor power 
circuit poor contact

 Output speed 

sensor failure

 TCU signal circuit 

failure

P1745

Second Speed Sensor 
Plausible 

Start engine and keep 
it at following status for 
at least 30 seconds: 
throttle opening higher 
than 10%, at D gear, 
vehicle speed higher 
than 10 km/h

Difference 
between output 
speed after 
conversing 
vehicle speed 
signal and actual 
measured speed 
is higher than 
limit

1

Check wire harness connector

Repair fault

NG

OK

18–

54

18

a. Turn ignition switch to LOCK and disconnect the negative 

battery cable.

b. Disconnect the wire harness connectors E-030 and E-079.
c. Check for continuity between the terminals 19, 50 and 54 

of wire harness connector E-030 and terminals 3, 2 and 1 
of connector E-079.

a. Turn ignition switch to LOCK and disconnect the negative 

battery cable.

b. Disconnect the wire harness connector E-030.
c. Check for continuity between the terminals 19, 50 and 54 

of wire harness connector E-030 and ground.

2

Check TCU wire harness

-

+

RT21180950

E-030

29 30 31 32 33 34 35 36 37 38 39 40 41 42

1 2 3 4 5 6 7 8 9 10 11 12 13 14

43 44 45 46 47 48 49 50 51 52 53 54 55 56

15 16 17 18 19 20 21 22 23 24 25 26 27 28

E-079

1

2

3

Repair or replace failed circuit

NG

OK

3

Check if TCU wire harness connector E-030 and ground is conductive

-

+

RT21180960

E-030

29 30 31 32 33 34 35 36 37 38 39 40 41 42

1 2 3 4 5 6 7 8 9 10 11 12 13 14

43 44 45 46 47 48 49 50 51 52 53 54 55 56

15 16 17 18 19 20 21 22 23 24 25 26 27 28

Repair or replace failed circuit

NG

OK

18–

55

18

a. Turn ignition switch to LOCK and disconnect the negative 

battery cable.

b. Disconnect the wire harness connector E-030.
c. Check if the terminals 19, 50 and 54 of wire harness 

connector E-030 are short to power.

a. Correctly install a new secondary shaft speed sensor.  
b. Using the X-431 3G diagnostic tester, check whether the system is normal.

a. Using X-431 3G diagnostic tester, select Read Code.
b. Check if DTC P0720 or P1745 still exists.

4

Check if TCU wire harness connector E-030 is short to power

RT21180970

E-030

29 30 31 32 33 34 35 36 37 38 39 40 41 42

1 2 3 4 5 6 7 8 9 10 11 12 13 14

43 44 45 46 47 48 49 50 51 52 53 54 55 56

15 16 17 18 19 20 21 22 23 24 25 26 27 28

-

+

V

Repair or replace failed circuit

NG

5

Check secondary shaft speed sensor

OK

Diagnosis complete

NG

6

Check for DTC

OK

Replace TCU

NG

System is normal

OK

18–

56

18

DTC Confirmation Procedure: 

Confirm that battery voltage is between 11 and 14 V before performing the following procedures.
 Turn ignition switch to LOCK.
 Connect X-431 3G diagnostic tester (the latest software) to Data Link Connector (DLC), and make it 

communicate with vehicle electronic module by the data network.

 Turn ignition switch to ON.
 Using X-431 3G diagnostic tester to record and clear the DTCs stored in the TCU.
 Turn ignition switch to LOCK and wait for a few seconds.
 Turn ignition switch to ON, and then select "Read Code".
 If DTC is detected, the malfunction indicated by the DTC is current. Go to the diagnosis procedure - Step 1.
 If DTC is not detected, the malfunction indicated by the DTC is intermittent. Please refer to Intermittent 

DTC Troubleshooting.

Diagnosis Procedure

HINT:
After the fault is eliminated, verify DTC and symptom again.

a. Engine wire harness (check for looseness, dirt and other fault)
b. Transmission sensor (check for damage, dirt and other fault)
c. Are all checks OK?

a. Use diagnostic tester to check the transmission system.
b. Is there any DTC except for P0730?

DTC

P0730

Incorrect Gear Ratio

DTC Code

DTC Definition

DTC Detection 

Condition

DTC Set 

Condition

Possible Cause

P0730

Incorrect Gear Ratio

Start engine and keep 
it at following status for 
at least 1 min: throttle 
opening not less than 
15%, at D gear, vehicle 
speed not less than 18 
km/h

The absolute 
value of 
difference of 
target speed 
ratio and actual 
speed ratio is 
higher than the 
standard value

 Speed ratio control 

valve body circuit 
seized

 Solenoid wire 

harness or 
connector open 
circuit or short 
circuit

 Auxiliary oil 

pressure control 
failure or too low

1

Carry out following preliminary checks

Repair fault

NG

2

Check transmission system

OK