Chery Tiggo. Manual — part 103
6.
CHECK MAF SENSOR
• For 1.8L engine, check air flow in data stream.
ECM TERMINAL NO.
ITEM
CONDITION
DATA (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
4 V
(instantaneous)
Is the check result normal?
Yes
>>
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
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?
Yes
>>
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?
Yes
>>
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
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?
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 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
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