Chery Tiggo. Manual — part 155
9.
PERFORM ACTUATE TEST FUNCTION
• Start engine.
• 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 12.
No
>>
Go to the next step.
10.
CHECK FUNCTION OF INJECTOR
• Listen to each injector operating sound.
• Operating sound should exist.
Is the check result normal?
Yes
>>
Go to step 12.
No
>>
Go to the next step.
DIAGNOSIS & TESTING
03
11.
CHECK INJECTOR POWER SUPPLY CIRCUIT AND CONTROL CIRCUIT
• Turn ignition switch off.
• Disconnect injector harness connector (1).
• Turn ignition switch on.
• Check injector supply voltage between sensor ter-
minal and ground in the electrical connector.
• Battery voltage should exist.
• Turn ignition switch off
• Disconnect ECM harness connector.
• Check harness continuity between following terminals.
INJECTOR NO.
ECM
TERMINAL
INJECTOR
TERMINAL
1
27
2
2
6
2
3
7
2
4
47
2
• Continuity should exist.
• Check harness for short to power.
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Repair or replace circuit for an open or short to power or short to ground in harness or connectors.
DIAGNOSIS & TESTING
BESM040006
LTSMD030024
12.
CHECK INJECTOR RESISTANCE
• Disconnect injector harness connectors (See Fuel Pressure Test in Section 04 Fuel Delivery).
• Check the resistance of the injectors.
INJECTOR
NO.
INJECTOR
TERMINAL
RESISTANCE
(APPROXIMATELY)
⍀ (20°C)
1
1 & 2
16
2
1 & 2
3
1 & 2
4
1 & 2
Is the check result normal?
Yes
>>
Go to the next step.
No
>>
Replace injector.
Go to step 14.
13.
CHECK INJECTOR
• Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
• Remove fuel delivery rail with injectors (See Fuel Injector Rail Removal & Installation 1.6L/1.8L/2.0L in Section
04 Fuel Delivery).
NOTE :
Be careful not to drop the fuel injectors when removing the fuel delivery rail.
• Keep fuel hose and all injectors connected to injector rail.
• Disconnect all ignition coil harness connectors.
• Prepare pans or saucers under each injector.
• Crank engine for about 3 seconds.
• Fuel should be sprayed evenly for each injector.
Is the check result normal?
Yes
>>
Go to next step.
No
>>
Clean or replace the defective fuel injector.
14.
CHECK DTC
• With the X-431 scan tool, read ECM DTCs.
• See DTC Confirmation Procedure.
Is DTC P0171 still present?
Yes
>>
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).
No
>>
The system is now operating properly.
Reassemble the vehicle and road test to verify the customers complaint is repaired.
DIAGNOSIS & TESTING
03
P0172 - Fuel Trim System Too Rich
DIAGNOSIS & TESTING
LTSMW030033T
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