Chery Tiggo 5 (T21). Manual — part 319
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DIAGNOSIS & TESTING
Diagnosis Help
1. 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.
2. Confirm that the malfunction exists, and perform the diagnosis tests and service procedures.
3. If the Diagnostic Trouble Codes (DTC) cannot be cleared, it indicates that there is a current malfunction.
4. Only the digital multimeter can be used when measuring the voltage of the electronic system.
5. Refer to any Technical Bulletin applied to the malfunction.
6. Visually check the related wire harness.
7. Check and clean the Electronic Power Steering controller (EPS controller) ground related to the latest
DTC.
8. If numerous trouble codes are set, refer to the circuit diagram and look for any common ground circuit or
power supply circuit applied to the DTC.
Intermittent DTC Troubleshooting
If it is an intermittent problem, perform the following procedures:
1. Check the connector for looseness.
2. Check the wire harness for wear, piercing, pinch or partial break.
3. Observe the diagnostic tester data related to this circuit.
4. Wiggle the related wire harness and connector and observe if the signal is interrupt in the related circuit.
5. Try to duplicate the conditions under which the DTC is set.
6. Check for the data that has changed or the DTC that has been reset during the wiggle test.
7. Check if the terminals are broken, bent, protruded out or corroded.
8. Check the sensor and mounting area for any condition that would result in an incorrect signal, such as
damage, foreign matter.
9. A data recorder and/or oscilloscope can be helpful in diagnosing the intermittent malfunction.
Ground Inspection
Groundings are often exposed to moisture, dirt or other corrosive areas. Corrosion (rust) may form additional
resistance. This additional resistance will change the way in which a circuit works. A loose or corroded ground
can drastically affect the electronically controlled circuit. Perform the following operations:
1. Remove the ground bolt or nut.
2. Check all the contact surfaces for tarnish, dirt, rust, etc.
3. Clean as necessary to ensure that the contacting is in a good condition.
4. Reinstall the bolt or nut securely.
5. Check for the accessories which may interfere with the ground circuit.
6. If several wires are crimped into one ground terminal, check for proper crimps. Make sure that all the wire
harnesses are clean, securely fastened and good contacted without crimping any excessive insulation
coat.
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Diagnostic Trouble Code (DTC) Chart
Code Name
Code Name
C1301
Steering Angle Sensor Electrical Error
C1302
Steering Angle Sensor Not Trimmed
C1307
Sensor Supply Voltage Error
C1308
Fail safety Relay Error
C1315
W/LAMP Fault
C1323
ECU Hardware Fault
C1332
Torque Sensor Error
C1351
Motor Position Sensor Error
C1352
Motor Error
C1901
Battery Under Voltage Error
C1902
Battery Over Voltage Error
C1910
IGN Voltage Error
U0155
ICM Update Error
U0418
Vehicle Speed Error
U1000
EMS Signal Error
U1027
CAN Update Error
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Diagnosis Procedure
a. Check EPS booster assembly power supply and ground circuit.
DTC
C1301
Steering Angle Sensor Electrical Error
DTC
C1302
Steering Angle Sensor Not Trimmed
DTC
C1307
Sensor Supply Voltage Error
DTC
C1323
ECU Hardware Fault
DTC
C1332
Torque Sensor Error
DTC
C1351
Motor Position Sensor Error
DTC
C1352
Motor Error
DTC
DTC Definition
Possible causes
C1301
Steering Angle Sensor Electrical Error
EPS booster assembly circuit
EPS booster assembly fault
C1302
Steering Angle Sensor Not Trimmed
C1307
Sensor Supply Voltage Error
C1323
ECU Hardware Fault
C1332
Torque Sensor Error
C1351
Motor Position Sensor Error
C1352
Motor 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 EPS booster assembly power supply and ground circuit
Repair or replace wire harness or
connector
NG
OK
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a. Using X-431 3G diagnostic tester, read the EPS DTC.
b. Check if DTC C1301, C1302, C1307, C1323, C1332, C1351 or C1352 still exists.
2
Check for DTCs
Replace EPS booster assembly
NG
The system is operating normally.
Reassemble the vehicle and perform a road test to confirm that the malfunction reported by the
customer has been repaired.
OK
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