2009 CHERY TIGGO engine

Downloaded from www.Manualslib.com manuals search engine 6.CHECK MAF SENSOR
• For 1.8L engine, check air flow in data stream.
ECM TERMINAL NO. ITEMCONDITIONDATA (AVERAGE DC
VOLTAGE)
37 Sensor signal•
Engine is running
• ECT: 78°C
• Idle: 795 RPM
• IAT: 36°C
• IAT signal voltage:
1.88 V Approximately 322 kg/h
Approximately 1.39 V
• For 1.6L engine, check MAP sensor signal voltage.
TERMINAL
NO. ITEM
CONDITION DATA (DC
VOLTAGE)
4 MAP
sensor Engine:
Running •
Engine
running: Idle
• Press
accelerator
pedal slowly Approximately
1.3 V
• Press
accelerator
pedal quickly Up to
Approximately 4V
(instantaneous)
Is the check result normal?
Ye s>>Go to the next step.
No
>>Check connectors for rusted terminals or loose connectors in the air flow sensor circuit or ground.
DIAGNOSIS & TESTING
03
03–125Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 7.CHECK THE FUEL PRESSURE
• Release fuel pressure to zero.
• Install fuel pressure gauge (2) and check fuel
pressure.
• Observe the following fuel pressures when testing (See Fuel Pressure Test in Section 04 Fuel Delivery).
FUEL PRESSURES
Key On 400 kPa (4.0 bar)
Key Off 380 kPa (3.8 bar) in 10 minutes
Engine: Idle 400 - 420 kPa (4.0 - 4.2 bar)
Is the check result normal?
Ye s>>Go to step 9.
No
>>Go to the next step.
8.DETECT MALFUNCTIONING PART
• Check the following:
Fuel pump and circuit
Fuel pressure regulator
Fuel lines
Fuel filter for clogging
Is the check result normal?
Ye s>>If with the X-431, go to the next step.
If without the X-431, go to step 10.
No
>>Repair or replace malfunctioning part.
DIAGNOSIS & TESTING
BESM030020
03–126Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 9.PERFORM ACTIVE 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?
Ye s>>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?
Ye s>>Go to step 12.
No
>>Go to the next step.
DIAGNOSIS & TESTING
03
03–127Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 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
12 72
262
372
44 72
• Continuity should exist.
• Check harness for short to power.
Is the check result normal?
Ye s>>Go to step 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
03–128Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 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)
11&2
16
21&2
31&2
41&2
Is the check result normal?
Ye s>>Go to the next step.
No
>>Replace injector.
Go to step 14.
13.CHECK INJECTOR
WARNING!
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.
• Observe the fuel injectors and crank engine for about 3 seconds.
• Fuel should be sprayed evenly by each injector.
Is the check result normal?
Ye s>>Go to next step.
No
>>Clean any injector that sprays unevenly or replace any injector that does not spray fuel.
DIAGNOSIS & TESTING
03
03–129Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine 14.CHECK DTC
• With the X-431 scan tool, read ECM DTCs.
• See DTC Confirmation Procedure.
Is DTC P0171 still present?
Ye s>>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
03–130Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine P0172 - Fuel Trim System Too Rich
DIAGNOSIS & TESTING
LTSMW030052T
03
03–131Chery Automobile Co., Ltd.

Downloaded from www.Manualslib.com manuals search engine DIAGNOSIS & TESTING
LTSMW030058T
03–132Chery Automobile Co., Ltd.