Releasing pressure in high pressure area (engine codes CCZA, CCZB, CCZC, CCZD) |
WARNING The injection system consists of a high-pressure section (maximum approx. 120 bar) and a low-pressure section (approx. 6 bar). |
Prior to opening the high-pressure area, e.g. when removing the fuel pressure sender -G247-, the fuel pressure in the high-pressure area must be reduced to a residual pressure of approx. 6 bar. The appropriate procedure is described as follows. |
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| Connect vehicle diagnosis tester and perform the guided function „Releasing high-pressure in fuel system“. |
WARNING The fuel lines are pressurised! Wear eye protection and protective clothing to avoid possible injury and skin contact. Before opening the high-pressure section, wrap a cloth around the connection. |
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| Wrap a clean cloth around the connection and carefully open to release residual pressure of approx. 6 bar. Catch the escaping fuel. |
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| When work is complete, read event memory of engine control unit and erase all event entries. |
Note
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