Chery Tiggo. Manual — part 269
U0001 - CAN Communication Error
DIAGNOSIS & TESTING
LTSMW080019T
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
DTC DEFINITION
DTC DETECTION
CONDITION
DTC SET
CONDITION
POSSIBLE CAUSE
U0001
CAN
Communication
Error
With the ignition
switch on
The Transaxle
Control Module
(TCM) lost
communication over
the CAN-Bus circuit.
The circuit is
continuously
monitored.
• CAN Converter
• Harness or
connectors (The
sensor circuit is open
or shorted)
• ECM
• Transaxle Control
Module (TCM)
DTC Confirmation Procedure:
Before performing the following procedure, confirm that battery voltage is more than 12 V.
• Turn ignition switch off.
• Connect the X-431 scan tool to the Data Link Connector (DLC) - use the most current software available.
• Start the engine and warm it to normal operating temperature.
• With the scan tool, select view DTC and data stream.
• If the DTC is detected, the DTC condition is current. Go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnostic Help and Intermittent DTC Trou-
bleshooting in Section 08 Transaxle & Transfer Case for more information).
NOTE :
• Ensure that the battery is fully charged.
• Before performing any DTC diagnostic procedures, verify the TCM power and ground circuits are properly con-
nected.
• Before performing the diagnostic procedure, repair all other TCM DTCs first.
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
Diagnostic Procedure
1.
CHECK GROUND CONNECTION
• Turn ignition switch off.
• Loosen and retighten ground screws on the body (See Ground Inspection in Section 12 Brakes).
• Inspect the ground connection C-201 mounting position (See Vehicle Wiring Harness Layout - Main Harness in
Section 16 Wiring).
Are the ground connections OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace the ground connections.
DIAGNOSIS & TESTING
08
2.
CHECK DTC
• Turn ignition switch on.
• With the scan tool, select view TCM DTC and data stream.
Is DTC U0001 present?
Yes
>>
Go to the next step.
No
>>
The condition that caused this DTC is intermittent (See Diagnostic Help in Section 08 Transaxle &
Transfer Case).
Erase all codes and test drive the vehicle to verify the repair is complete.
3.
CHECK OTHER MODULE DTC
• With the scan tool X-431, attempt to enter all the other CAN communication modules such as ECM, CAN con-
verter module.
• Read the CAN DTCs.
Were other modules DTCs found?
Yes
>>
If all of the other modules have the same DTC
⬙CAN Communication⬙, go to the next step.
If all of the other modules have the DTC
⬙Lost communication with TCM⬙, and do not have the ⬙CAN
Communication
⬙, replace and program the TCM module.
No
>>
Go to step 8.
4.
CHECK CAN-BUS LINE TERMINAL RESISTANCE IN TCM
• Turn the ignition switch off.
• Disconnect the negative battery cable.
• Disconnect TCM connector.
• Check resistance between TCM connector 38 and 39.
CAN TERMINAL RESISTANCE
CAN-H
CAN-L
RESISTANCE
38
39
123
⍀
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace TCM.
The problem caused by TCM internal error.
DIAGNOSIS & TESTING
5.
CHECK CAN-BUS LINE
• Disconnect ECM and CAN converter connectors.
• Check for harness continuity between the following terminals:
CHECK CAN-H CONTINUITY
CAN
TCM
TERMINAL
ECM
TERMINAL
CONTINUITY
CAN-
H
38
62
Yes
CHECK CAN-L CONTINUITY
CAN
TCM
TERMINAL
ECM
TERMINAL
CONTINUITY
CAN-
L
39
81
Yes
• Check the harness for short to ground and short to power.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace CAN-Bus line.
DIAGNOSIS & TESTING
08
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