Sensor test
1. Power check.
A) Disconnect the sensor connector.
b) Turn on «ignition».
V) Measure the voltage between terminals VC and E2 of the connector.
Supply voltage - 4.75 - 5.25 V
G) Turn off «ignition».
d) Connect the sensor connector.
2. Checking the signal.
A) Turn on «ignition».
b) Disconnect the sensor vacuum hose from the intake manifold.
V) Connect a voltmeter to the PIM and EG terminals of the preheat timer and measure the signal voltage at atmospheric pressure.
G) Apply a vacuum to the sensor in 0.13 bar increments (see table 1).
d) Measure the signal voltage drop.
e) Pressurize the sensor in 0.2 bar increments (see table 2).
and) Measure the voltage rise of the signal.
h) Reconnect the vacuum hose.
Table 1
Underpressure (bar) | 0,13 | 0,26 | 0,39 |
Voltage drop (IN) | 0,3-0,5 | 0,6-0,8 | 0,95-1,15 |
Table 2
Pressure (bar) | 0,2 | 0,4 | 0,6 | 0,8 | 1,0 |
Voltage boost (IN) | 0,4-0,7 | 0,9-1,2 | 1,4-1,7 | 2,0-2,3 | 2,5-2,8 |
Troubleshooting
Note: In case of insufficient throttle response, loss of power or increased fuel consumption, check the engine itself before diagnosing the boost system (valve clearance, fuel injection advance, etc.).
Possible reason | Method of verification and place of correction |
1. Low boost pressure | Check boost pressure |
2. Increased resistance in the air intake system | Check the intake system, repair or replace parts if necessary |
3. Leakage in the air intake system | Check the intake system, repair or replace parts if necessary |
4. Increased resistance in the exhaust system | Check exhaust system, repair or replace parts if necessary |
5. Exhaust system leakage | Check exhaust system, repair or replace parts if necessary |
6. Unstable operation of the turbocharger | Check compressor wheel rotation. If it does not rotate, or there is increased resistance to rotation, replace the turbocharger. Check the axial and radial shaft clearances. If any clearance is greater than normal, replace the turbocharger. |
Abnormal noise
Possible reason | Checking Method and Correction Method |
1. Turbine heat shield jitter | Check fastening, installation or deformation of heat shields, replace if necessary |
2. Leakage in the exhaust system | Eliminate Leaks |
3. Unstable operation of the turbocharger | see above, accompanied by poor throttle response, loss of power or increased fuel consumption |
Increased oil consumption or white smoke
Possible reason | Checking Method and Correction Method |
Defect in the oil seals of the turbocharger bearing housing | Check the presence of oil in the exhaust system: disconnect the intake pipe of the exhaust system from the turbine and check for soot deposits on the turbine wheel (a large amount of deposits indicates a malfunction of the turbocharger). Check for oil in the air intake system. Check the turbocharger shaft clearances. |
Diagnostics of the electrical equipment of the pressurization system (engine 2L-T)
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