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Troubleshooting pdf re Mechatronic unit on 6HP26 ZF Automatic
This 21 page pdf shows possible problems within the Mechatronic unit of the ZF 6HP26 six speed automatic. On page 19/21 is a drawing showing how all the various control circuits interface with the vehicle.
Of particular interest were comments with regards to fine metal contamination of various electrical contacts. This is probably why a mere oil change can improve the operation of the transmission - reduced conductivity of the oil.
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ZF_Transmission_Repair_ZF_6HP26_Pulling_and_Troubleshooting_The_Mechatronics_Unit_E_shift_Unit_by_wilson009.pdf
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