Engine Controls - System & Component Testing: Diagnosis Volvo S40 I рестайлинг

General Inspection

The following points should be carefully checked if leakage is suspected. (Scheme 11) Both the hoses and hose connections must be checked.

1. Upper charge-air pipe
2. Turbocharger control valve and the boost pressure control valve
3. Brake servo
4. Crankcase ventilation
5. Mass air flow sensor
6. Air intake hose
7. Turbocharger control valve
8. Throttle body
9. Lower charge-air pipe
10. Idle air control valve
11. EVAP charcoal filter
12. Canister purge valve
13. Vacuum connections on the intake manifold
14. Charge air cooler
15. Intake manifold and the gasket
16. Crankcase ventilation and the oil trap
17. Fuel pressure regulator
18. Injectors and seals
19. Exhaust system

Scheme 11

The following points should be carefully checked if leakage is suspected. Both the hoses and hose connections must be checked.

1. Pressure regulator for the idle air control valve
2. Charge air cooler
3. Turbocharger control valve
4. EVAP system
5. Crankcase ventilation

Scheme 12

Scheme 13

1. Inspect all tube connections. Ensure each is undamaged and connected fully with clamp tightened. Check hose between the charge air cooler and Idle Air Control (IAC) valve for damage and cracking. Charge air cooler is installed in front of radiator. Replace if necessary.
2. Disconnect fresh air intake hose from Mass Air Flow (MAF) sensor. Connect Adapter (999-5545) and Pressure Regulator (999-5544) to intake hose. (Scheme 12) Seal crankcase ventilation hose using a hose clip and remove oil filler cap. (Scheme 13) Disconnect lower hose from canister purge valve.
3. Adjust Pressure Regulator to a maximum pressure of 4.3 psi (0.3 bar). Slight hissing from oil filler cap opening is normal.
4. Apply soap solution to all hose connections. Bubbles are normal around throttle spindle and between throttle body and intake hose if hose is plastic. Bubbles are not normal around rubber hose connections or anywhere else on intake system. Repair leaks as necessary and go to next step.
5. Remove pressure testing equipment. Connect hoses. Ensure all hose clamps are tightened and all components are reinstalled.

Fuel Injector Leakage Inspection

Remove the spark plugs. Note the cylinder from which each spark plug was removed. Check that none of the spark plugs have a lighter or darker color than the others. If any of the spark plugs are lighter or darker, this may be an indication of a defective injector. Replace as necessary. See FUEL INJECTORS under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - S40 & V40 article.

Fuel Injector Resistance Test

Turn ignition off. Disconnect fuel injector connector. Measure resistance between injector terminals. Normal resistance across injector terminals is approximately 14-15 ohms at about 68°F (20°C). Replace injector as necessary.