Chery Tiggo. Manual — part 203
44 - Ignition Signal
DIAGNOSIS & TESTING
LTSMW030007T
03
Check reference values between ECM terminals and ground under the following conditions:
ECM TERMINAL NO.
ITEM
CONDITION
DATA (DC VOLTAGE)
10
Ignition coil 1
Engine: 3000 RPM
0.3 - 3.0 V
23
Ignition coil 2
0.3 - 3.0 V
On Board Diagnostic Logic
• Self-diagnosis detection logic.
DTC NO.
DTC DEFINITION
DTC DETECTION
CONDITION
DTC SET
CONDITION
POSSIBLE CAUSE
44
Ignition signal
• Engine speed: 50
- 4000 RPM
• Except decelerate
and accelerate
suddenly or
decelerate suddenly
The misfire times of
No.1 and No.4 or
No.2 and No.3 is
more than the reset
misfire times of per
1000 RPM.
• Ignition coil
• Ignition primary
harness or
connectors
• Spark plug and
tension cable
• Cylinder pressure
• 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.
• 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 :
Before performing the following procedure, make sure that the ECM ground connection is in good condition.
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 03 Electronic Engine Con-
trols).
• Inspect the ground connections E-207 and E-208 (See Vehicle Wiring Harness Layout - Engine Room Harness
(With Mitsubishi 2.4L Engine) in Section 16 Wiring).
Is the ground connections OK?
Yes
>>
Go to the next step.
No
>>
Repair or replace ground connection.
DIAGNOSIS & TESTING
2.
CHECK ENGINE START
• Start the engine.
Is any cylinder ignited?
Yes
>>
If with the X-431, go to the next step.
If without the X-431, go to step 3.
No
>>
Go to step 4.
3.
PERFORM ACTIVE TEST FUNCTION
• Select ⬙ACTIVE TEST⬙ menu.
• Perform ignition active test (If the X-431 has the function).
• Make sure that each test produces a momentary engine speed drop.
Is the check result normal?
Yes
>>
Inspection end.
No
>>
Go to step 4.
4.
CHECK FUNCTION OF IGNITION
• Let engine run at 3000 RPM.
• Read voltage signal between ECM terminals 10, 23 and ground.
IGNITION
COIL
TERMINAL
NO.
ITEM
CONDITION
DATA (DC
VOLTAGE)
10
Ignition coil
1 terminal 3
Engine:
3000 RPM
0.3 - 3.0 V
23
Ignition coil
2 terminal 3
0.3 - 3.0 V
• If with check tool-timing mark lamp, check the actual ignition time.
CHECK ITEM
CONTENT
NORMAL VALUE
Ignition coil with power
transistor
• Engine: Warm-up
condition
• Timing lamp (For check
the actual ignition time)
Engine: Idle
2 - 18° BTDC
Engine: 2500 RPM
18 - 38° BTDC
Is the check result normal?
Yes
>>
Go to step 10.
No
>>
Go to the next step.
DIAGNOSIS & TESTING
03
5.
CHECK IGNITION COIL ELECTRICAL CONNECTOR
• Turn ignition switch off.
• Disconnect the ignition coil electrical connector (1).
• 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.
6.
CHECK IGNITION COIL POWER SUPPLY CIRCUIT FOR AN OPEN OR SHORT
• Turn ignition switch on.
• Check supply voltage between ignition coil terminal
1 and ground in the ignition coil electrical connec-
tor.
• 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:
− Fuse 15
− Front fuse and relay box B8
− Harness connectors A-102, E-105
− Harness open or short between ignition coil and fuse
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace malfunctioning parts.
DIAGNOSIS & TESTING
LTSM030017
LTSMD030022
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