Chery Tiggo 5 (T21). Manual - part 320

30–

12

30

DTC

C1901

Battery Under Voltage Error

DTC

C1902

Battery Over Voltage Error

ET21300020

BATTERY

R

B

MF09

80A

A1

EPS

A2

L

E-077

A1

A2

E-077

E-081

E-064

EPS 
POWER

E-064

30–

13

30

Diagnosis Procedure

a. Check if battery voltage is normal.

a. Check if battery terminals are loose or corroded.

a. Turn ignition switch to LOCK.
b. Check EPS ground point E-081.

DTC

DTC Definition

Possible causes

C1901

Battery Under Voltage Error

 Fuse
 Wire harness or connector
 Battery
 Battery terminal
 EPS booster assembly

C1902

Battery Over Voltage Error

CAUTION

 When performing the circuit diagnosis and test, always refer to the circuit diagram for the specific circuit 

and the component information.

1

Check battery

Recharge or replace battery

NG

2

Check battery terminals

OK

Tighten or replace battery terminals

NG

3

Check EPS ground point

OK

Repair or replace ground wire harness or 
ground point

NG

OK

30–

14

30

a. Disconnect EPS power supply connector E-077.
b. Check connector.

a. Measure voltage between EPS power supply connector 

E-077 terminal A1 and body ground.

a. Check EPS power supply fuse MF09 (80A) outside the engine compartment fuse and relay box.

4

Check EPS power supply connector

Repair or replace EPS power supply 
connector

NG

5

Check EPS power supply voltage

OK

E-077

A1

A2

-

+

V

RT21305001

Multimeter 

Connection

Condition

Specified 

Condition

E-077 (A1) - Body 

ground

Always

11 to 14 V

Go to step 8

OK

6

Check EPS power supply fuse

NG

Replace EPS power supply fuse

NG

OK

30–

15

30

a. Disconnect EPS power supply connector E-064.
b. Check wire harness between the connector terminals.

Check for Open

Check for Short

a. Disconnect EPS connector E-077.
b. Check wire harness between terminal A2 of E-077 and 

ground point E-081.

7

Check wire harness and connector (EPS - EPS power supply)

E-077

A1

A2

E-064

RT21305002

-

+

Multimeter Connection

Specified 

Condition

E-064 - E-077 (A1)

Continuity

Multimeter Connection

Specified 

Condition

E-077 (A1) - Body ground

No continuity

Repair or replace wire harness or 
connector

NG

Repair or replace engine compartment fuse and relay box or wire harness (engine compartment fuse 
and relay box - battery)

8

Check EPS ground circuit

OK

E-081

E-077

A1

A2

RT21305003

-

+

Multimeter 

Connection

Condition

Specified 

Condition

E-077 (A2) - 

E-081

Always

Continuity

Repair or replace wire harness or 
connector

NG

OK