2.6.6 Electrical schematic diagram 

2.6.6.1 Electrical schematic diagram 

FE02-2073b

 

Throttle position (TPS) sensor 

Crankshaft position (CKP) 

sensor 

Camshaft position (CMP) 

sensor 

Air intake pressure force 

temperature sensor 

Speed signal (VSS) 

Coolanttemperature sensor 

(ECT) 

Engine control module

VVT electromagnetic valve 

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2.6.7 Diagnostic information and procedures 

2.6.7 Diagnostic information and procedures 

2.6.7.1 Diagnosis descriptions 

Refer to 2.6.3.1 System Working Principle to get familiar with the system functions and operations 
before starting the system diagnosis, so that it will facilitate the correct diagnostic steps, more 
importantly, it will also help to determine whether the situation described by the customer 
described is normal. 

2.6.7.2 Visual inspection 

z  Inspect installed after market equipment that may affect the mechanical systems 

performance. 

z  Check the system components that is easy to access to identify whether there is significant 

damage or potential faults. 

z  Confirm whether the engine lubrication oil level is normal and whether the engine oil 

viscosity is normal. 

z  Record engine speed, ambient temperature and other specific factors. 

z  Compare with a known good engine to check whether the current engine status is normal. 

2.6.7.3 Comprehensive Inspection of Engine 

1.  Inspect engine coolant. 

Refer to 2.8.8.1 Engine Coolant Discharge and Filling. 

2.  Inspect engine lubrication oil. 

Refer to 2.9.7.4 Engine Oil Pressure Diagnostic and Test. 

3.  Inspect the battery. 

Refer to 2.11.2.1 Charging System Description and Operation. 

4.  Check the spark plug 

See "2.10.6.3 Inspection and Diagnosis of Spark Plug". 

5.  Inspect the air filter. 

A.  Dismantle the air filter. 

B.  Inspect the air filter for the dust, blockage or breakage. 

1)  For dust, clean it with the compressed air. 

2)  After using the compressed air, if there is still dust or blockage, replace the air filter. 

6.  Inspect the ignition timing. 

Inspect the ignition timing. The following conditions must be met: 

z  The engine must reach the normal working temperature. 

Use fault diagnosis tester to test methods: 

A.  rotated ignition switch to OFF position. 

1 

Connect a fault diagnosis tester. 

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B.  Connect fault diagnosis tester to the diagnostic interface. 

C.  Start the engine to normal working temperature. 

D.  Turn off the A/C switch. 

E.  Select in sequence: Engine / Data List / Cylinder #1 ignition advance angle. 

Standard Timing: Standard idling 1° -7° before TDC. 

Use the timing light to test: 

1 

Dismantle the engine hood cover. 

 

2 

Pull out cylinder No.1 high-pressure resistor wire. 

Connect the clips of the timing lights to the cylinder No.1 high-pressure resistor wire. 

 

Standard Timing: Standard idling 1° -7° before TDC. 

 

4 

Inspect the ignition timing during acceleration. 

Accelerate the engine; observe the engine ignition timing, which should be moving ahead as 
shown. 

1

0

0

GC02-0009c

 

 

3 

Inspect the ignition timing when idling. 

5 

Dismantle the timing light and restore high-voltage resistor wire to the installation 

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7.  Cylinder Compression Test 

Precautions: Dismantle EF12 fuses. Fuel and ignition systems can not work. After the test 
clear the DTC code with a fault diagnosis tester. 

Before the compression test is done, the following conditions must be met: 

z  The engine must reach the normal working temperature. 

z  Throttle in full open. 

z  Dismantle all four cylinder spark plugs. 

z  The battery has no phenomenon of the loss of electricity and must be fully charged. 

Important precaution : During the start-up test, the ignition switch can not remain at the 
"ST" position for more than 15 s, otherwise it will damage the starter. 

 

2 

Spray proper amount of engine oil into each cylinder 

 

3 

Install the cylinder pressure test gage to the spark plug installation port. 

 

4 

Turn the ignition switch to the "ST" position, so that each cylinder runs 4 to 5 
compression strokes. 

 

5 

Individual cylinder pressure readings should not be less than 75% of the maximum 
and any cylinder pressure gage reading should not be less than 750 kPa. 

 

6 

Inspect the pressure gage readings for each cylinder after the completion of four 
compression stroke. The readings are explained as follows: 

position. 

Test is completed. 

1 

Test pressure of each cylinder, pressure dropping may be due to valve closure or piston 
ring wear. 

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