Chery Tiggo 5 (T21). Service 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
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