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Thread: OBD II engine / harness ground locations ?

  1. #1
    Join Date
    Sep 2021
    Location
    Pasadena, MD
    Posts
    37
    My Cars
    328is drift, 325ic daily

    OBD II engine / harness ground locations ?

    hi,
    i swapped my '96 328is engine (220k) that had a blown head gasket and was eating oil to a '96 328i sedan (180k) that ran and drove well.

    my coupe was an auto car (that i manual swapped), the sedan was manual.

    i swapped the engine, used my coupe harness (with auto trans ecu). battery is fully charged, engine cranks over but i do Not have spark. i plugged in my obd II scanner and it says it cant communicate with the ecu....

    i have the harness ground on the passenger side strut tower and i have the passenger side engine mount to the chassis. it's an obd ii car so there's no ground on the vanos oil unit.

    the 2 or 3 grounds on the coil packs are all ON and tight.

    what other grounds are there / should i look for ?

  2. #2
    Join Date
    Jun 2010
    Location
    NY
    Posts
    9,079
    My Cars
    1997 328i
    I believe there is a ground near the stock air box. Check the b+ jump post, confirm there is +12v at all of the red wires under it. Its common for people to put the 12v wires under the jump post in the wrong locations and that will trip the fusible link on the smaller of the two red wires leaving the battery.
    Attn. NEWBIES: Use the search feature, 98% has already been discussed.
    Click the search button, select "search single content type", select the "e36 sub forum" specifically, try the "search titles" then try the "search entire posts".

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