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. Pin 87 comes from ECM B fuse (underhood) Circuit/System Description The electronic control module (ECM) converts the data from the vehicle speed sensor to a 128K pulses/mile signal Lbz duramax bad ecm Lbz duramax bad ecm Click the button below to add the 2002 - 2004 Duramax LB7 Remanufactured ECM to your wish list The pictures show a round female pin for the LBZ,. If you want to try and do it yourself, check all grounds are clean. Check resistance and wiring for shorts, specifically where it reaches the tight areas if it’s close to moving elements. Check the wiring going to fuel injector, pump, fuel pump relay, crankshaft sensor, ignition coil, ignition module, top of the fuel tank, and ECM itself.