VOLVO
ECM-4038 - Brake vacuum. Too low vacuum
Układ
Sterownik silnika (ECM)
Modele Volvo, których dotyczy ten kod błędu
Ten kod błędu ma różne znaczenie w zależności od modelu, rocznika lub silnika. Wybierz znaczenie, które dotyczy Twojego samochodu.
Dotyczy następujących modeli:
5 modeliC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000)
Pokaż modele wg rocznika i silnika (8)
- Volvo C70 Cabriolet (1998–2005)2000Tylko silnik: B5244S
- Volvo C70 Coupé (1998–2002)1999Tylko silnik: B5254S DENSO
- Volvo C70 Coupé (1998–2002)2000Tylko silnik: B5244S
- Volvo S70 (1997–2000)1999Tylko silnik: B5252FS, B5254S DENSO
- Volvo S70 (1997–2000)2000Tylko silnik: B5244S, B5244S2, B5244SG, B5244SG2
- Volvo S80 (1999–2006)1999–2000Tylko silnik: B5244S, B5244S2
- Volvo V70 (1997–2000)1999Tylko silnik: B5254S DENSO
- Volvo V70 (1997–2000)2000Tylko silnik: B5244S, B5244S2, B5244SG, B5244SG2
Co oznacza ten kod błędu?
The engine control module monitors that the engine can supply the brake booster with enough vacuum. The fault code is set when the difference between the intake manifold pressure and the air pressure around the car is too small while the airflow into the engine is too high. The code usually appears together with other fault codes that point to an airflow problem, and those should be checked first.
Możliwe przyczyny
- Air leak at the joint between the throttle body and the cylinder head
- Blocked, condensed or dirty lines running from the pressure sensor to the intake manifold
- Fault in the throttle unit or its throttle control
- Incorrect signal from the pressure sensor
Co możesz zrobić
- 1Check other fault codes in the engine control module first, especially those for the throttle or airflow, since this code is often a result of them
- 2Make sure there is no air leak at the joint between the throttle body and the cylinder head
- 3Inspect the vacuum lines running from the pressure sensor to the intake manifold for blockage, condensation and dirt
- 4Have you got a diagnostic tool: compare the intake manifold pressure with the air pressure around the car at idle and check that they differ
- 5Switch off the ignition and wait until the throttle control module has shut down, then cycle the ignition and wait again before rechecking
- 6Have a workshop check whether the engine control module has the upgraded software from 2006 or later, and load it if it is missing
Objawy, które możesz zauważyć2
- Uneven idle
- Poorer performance at high speed
Na co może wpływać usterka3
- Cruise control is switched off during the operating cycle in which the fault was detected, and works again at the next start if the fault is gone
- Engine speed is controlled by cutting fuel to the cylinders one at a time, and the speed is limited
- The uneven idle may come from this reconfiguration rather than from a real drivability fault that existed before
Ogólne wskazówki dla właścicieli. Diagnostyka na samochodzie może wskazać inną przyczynę.