Chery Tiggo 5 (T21). Service manual - part 378

34–

12

34

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

DTC

B1300

Internal Control Module EEPROM Error

DTC Code

DTC Definition

DTC Detection 

Conditions

Possible Causes

B1300

Internal Control 
Module EEPROM 
Error

Ignition switch ON

 Immobilizer Control Module

CAUTION

 If the ECM or immobilizer control module is replaced, match the system with the X-431 3G diagnostic 

tester (

See page 34-7

).

1

Replace immobilizer control module

System is operating normally

OK

34–

13

34

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

a. Turn ignition switch to LOCK.
b. Loosen and retighten the ground bolt or nut.
c. Check the installation position of the ground connection.

a. Turn ignition switch to LOCK.

DTC

B1301

Immobilizer and ECM authentication failed

DTC Code

DTC Definition

DTC Detection 

Conditions

Possible Causes

B1301

Immobilizer and ECM 
authentication failed

Ignition switch ON

 Wire harness or connector
 Immobilizer control module
 ECM

CAUTION

 If the ECM or immobilizer control module is replaced, match the system with the X-431 3G diagnostic 

tester (

See page 34-7

).

1

Check ground connection

Repair or replace ground connection

NG

2

Check engine control module (ECM) connector

OK

34–

14

34

b. Disconnect the ECM connector E-033.

c. Check if connector is damaged.

a. Turn ignition switch to LOCK.
b. Disconnect the immobilizer control module connector 



I-018 and immobilizer coil connector.

c. Check if connectors are damaged.

a. Replace the immobilizer control module and match it with X-431 3G diagnostic tester (

See page 34-7

).

b. Reconnect all the wire harness connectors that are disconnected.
c. Check if DTC still exists.

RT21380241

Repair or replace connector if necessary

NG

3

Check immobilizer control module connector and immobilizer coil connector

OK

RT21340100

Repair or replace connectors if necessary

NG

4

Replace immobilizer control module

OK

Replace ECM

NG

System is operating normally

OK

34–

15

34

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

a. Using X-431 3G diagnostic tester, write the VIN data (

See page 34-7

). 

DTC

B1302

VIN Not Programmed

DTC Code

DTC Definition

DTC Detection 

Conditions

Possible Causes

B1302

VIN Not Programmed

Ignition switch ON

 Immobilizer control module

CAUTION

 If the ECM or immobilizer control module is replaced, match the system with the X-431 3G diagnostic 

tester (

See page 34-7

).

1

Write VIN data

Replace immobilizer control module

NG

System is operating normally

OK