Mercedes GL 350 W166 Air suspension failure error C155664 C156C00 C157200 C156200 Rear end low #agra

Mercedes GL 350 W166 Air suspension failure error C155664 C156C00 C157200 C156200 Rear end low #agra

AIRMATIC Malfunction" in display: In the quick test one or more of the following fault codes is displayed:- C156C00 The pressure line system is leaking.- C157200 The correction time while filling is too long.- C156200 The actuation of the compressor has a malfunction.- C155664 The compressed air sensor for system pressure has a malfunction. There is an implausible signal. Cause: In the vast majority of cases the cause is a leaking AIRMATIC system, or in isolated cases the excessively sensitive monitoring of the system by the AIRMATIC software, but not a faulty compressor. Remedy: The following procedure must be followed. General requirement: The intake hose of the compressor is not blocked/kinked or trapped by the compressor cover. The cover of the compressor must be removed in order to check the intake hose correctly. The XENTRY tests must be performed with the latest software release. (At least DVD 11/2011) 1. Perform pneumatic test of pressure line between compressor and valve unit using XENTRY. Check the pressure line for leaks with a leak detector spray and eliminate any leaks if necessary. Note: If the compressor fails to start during test 1, check the compressor relay, the cable set and the associated electrical connections of the compressor. 2. Perform pneumatic test of compressor using XENTRY. Replace the compressor if it fails the test. 3. Perform pneumatic test of pressure relief valve using XENTRY. Replace the compressor if it fails the test. Note: If tests 1-3 are passed, there is a leak elsewhere in the AIRMATIC system. For this, perform tests 4-9. 4. Leak test between AIRMATIC valve unit and central reservoir
5. Pneumatic test of left front level control valve 6. Pneumatic test of right front level control valve 7. Pneumatic test of left rear level control valve 8. Pneumatic test of right rear level control valve 9. Check of valve unit: If the vehicle level rises during the compressor test, it can be assumed that the level control valves are not closing correctly. In this case the valve unit must be replaced. If all the tests are passed, there is most likely a micro-leak in the AIRMATIC system. If possible ask the customer whether the vehicle level at the rear axle has dropped overnight.

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