Chery Tiggo. Manual — part 113
DIAGNOSIS & TESTING
LTSMW030049T
03
Check reference values between ECM terminals and ground under the following conditions:
TERMINAL NO.
ITEM
CONDITION
DATA (AVERAGE DC
VOLTAGE)
6
Injector 2
• Engine is running
• Warm-up condition
• Idle
• Accelerate suddenly
Voltage: 11 - 14 V
7
Injector 3
27
Injector 1
47
Injector 4
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
DTC DEFINITION
DTC DETECTION
CONDITION
POSSIBLE CAUSE
P0262
Cylinder 1 - Injector Circuit
High
Engine is running
• Injector
• Harness or connectors
• ECM
P0265
Cylinder 2 - Injector Circuit
High
P0268
Cylinder 3 - Injector Circuit
High
P0271
Cylinder 4 - Injector Circuit
High
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.
• Start engine and warm it to normal operating temperature then select view DTC.
• If DTC is detected, go to Diagnostic Procedure - Step 1.
• If the DTC is not detected, the DTC condition is intermittent (See Diagnosis & Testing Diagnostic Help in Sec-
tion 03 Electronic Engine Controls).
NOTE :
While performing electrical diagnosis & testing, always refer to the electrical schematics for specific circuit
and component information.
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 1.6L/1.8L Engine) in Section 16 Wiring).
Are the ground connections OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace ground connections.
DIAGNOSIS & TESTING
2.
INSPECTION START
• Start engine.
Is any cylinder ignited?
Yes
>>
If with the X-431, go to the next step.
If without the X-431, go to step 4.
No
>>
Go to step 5.
3.
PERFORM ACTIVE TEST FUNCTION
• Select ⬙ACTIVE TEST⬙ menu.
• Perform injector active test.
• Make sure that each test produces a momentary engine speed drop.
Is the check result normal?
Yes
>>
Go to step 10.
No
>>
Go to step 5.
4.
CHECK FUNCTION OF INJECTOR
• Listen to injector operating sound one by one.
Do all injectors clicking noise exist?
Yes
>>
Go to step 10.
No
>>
Go to the next step.
5.
CHECK INJECTOR ELECTRICAL CONNECTOR
• Disconnect the Injector (1) electrical connector.
• Inspect the electrical connector for damage.
Is the electrical connector OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace the electrical connector
as necessary.
DIAGNOSIS & TESTING
BESM040006
03
6.
CHECK INJECTOR POWER SUPPLY CIRCUIT FOR SHORTED
• Turn ignition switch on.
• Check injector supply voltage between sensor ter-
minal and ground in the electrical connector.
• Battery voltage should exist.
Is the check result normal?
Yes
>>
Go to step 8.
No
>>
Go to the next step.
7.
DETECT MALFUNCTIONING PART
• Check the following:
− Front fuse and relay box F3, A13, G5
− Fuse 12, fuse 24, fuse 27
Without EOBD (1.6L)
− Front fuse and relay box F3, G2, G5
− Fuse 12, Fuse 23, Fuse 24
• Check harness for open or shorted between injector and fuse.
Is the check result normal?
Yes
>>
With the X-431, check the system, If OK, go to the next step.
No
>>
Repair or replace malfunctioning parts.
8.
CHECK INJECTOR CONTROL CIRCUITS FOR A SHORT
• Check injector control circuit voltage.
• 3.6 V should exist.
Is the check result normal?
Yes
>>
Go to step 10.
No
>>
Go to the next step.
DIAGNOSIS & TESTING
LTSMD030024
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