Chery Tiggo. Manual — part 177
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
DTC DEFINITION
DTC DETECTION
CONDITION
DTC SET
CONDITION
POSSIBLE CAUSE
U0001
High speed CAN
defective
With the ignition
switch on
ECM detected that
lost communication
over the CAN BUS
circuit. The circuit is
continuously
monitored.
• Harness or
connectors
• TCM
• ECM
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.
• Turn ignition switch on.
• With the scan tool, record and erase stored DTCs in the ECM.
• Cycle ignition switch several times then 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 03 Electronic Engine Controls for more information.
NOTE :
• Ensure that the battery is fully charged.
• Before performing any DTC diagnostic procedures, verify the ECM power and ground circuits are properly con-
nected.
• Before performing the diagnostic procedure, settle all other ECM DTCs first.
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
DIAGNOSIS & TESTING
03
Diagnostic Procedure
1.
CHECK GROUND CONNECTIONS
• Turn ignition switch off.
• Loosen and retighten ground screws on the body (See Ground Inspection in Section 03 Electronic Engine Con-
trols).
• Inspect ground connections E-207 and E-208 mounting position (See Vehicle Wiring Harness Layout - Engine
Room Harness (With 2.0L Engine) in Section 16 Wiring).
Are the ground connections OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace ground harness or connections.
2.
CHECK DTC
• Turn ignition switch on.
• With the scan tool, select view ECM CAN DTC and data stream.
Is DTC U0001 present?
Yes
>>
Go to the next step.
No
>>
The conditions that caused this code to set are not present at this time. See Diagnostic Help in Sec-
tion 03 Electronic Engine Controls.
Erase all codes and test drive the vehicle to verify the repair is complete.
3.
CHECK THE OTHER MODULES CAN DTC
• With the scan tool X-431, enter all the other CAN communication modules such as TCM, CAN converter mod-
ule.
• Read the CAN DTC.
Were other modules CAN 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 ECM⬙, and do not have the ⬙CAN
Communication
⬙, Replace and program the ECM module.
No
>>
Go to step 8.
DIAGNOSIS & TESTING
4.
CHECK CAN-BUS LINE TERMINAL RESISTANCE IN ECM
• Turn ignition switch off.
• Disconnect battery positive cable.
• Disconnect ECM connector (1).
• Check resistance between ECM connector terminal 62 and 81.
ECM
CONNECTOR
TERMINAL
(CAN-H)
ECM
CONNECTOR
TERMINAL
(CAN-L)
RESISTANCE
62
81
123
⍀
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace the ECM.
NOTE : The Immobilizer control module must be matched to the new ECM (See ECM Removal & Instal-
lation in Section 03 Electronic Engine Controls).
The problem caused by ECM internal error.
DIAGNOSIS & TESTING
LTSMD030077
03
5.
CHECK THE CAN-BUS LINE
• Disconnect TCM and CAN converter connectors (See Transaxle Control Module Remove & Installation in Sec-
tion 08 Transaxle).
• Check harness (CAN-H) continuity between following terminals.
CAN
TCM
CONNECTOR
TERMINAL
ECM
CONNECTOR
TERMINAL
CONTINUITY
CAN-
H
38
62
Yes
• Check harness (CAN-L) continuity between following terminals.
CAN
TCM
CONNECTOR
TERMINAL
ECM
CONNECTOR
TERMINAL
CONTINUITY
CAN-
L
39
81
Yes
• Also check harness for short to ground and short to power.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace the CAN-Bus line.
DIAGNOSIS & TESTING
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