how to determine my crank sensor is dead?

Discussion in 'Gen 1 & 2 - Engine, Exhaust, Drive Line & AC syste' started by sho_ted, May 4, 2021.

  1. sho_ted

    sho_ted SHO Member

    Joined:
    Feb 9, 2008
    Messages:
    350
    Likes Received:
    52
    Location:
    Albany, NY
    car wont start, has no spark.
     
  2. NoSlo

    NoSlo SHO Owner

    Joined:
    Aug 21, 2003
    Messages:
    799
    Likes Received:
    585
    Location:
    Portland, OR
    Home Page:
    Here's a thread that has some info about the pinout and testing the crank position sensor:
    https://shoforum.com/index.php?threads/crank-position-sensor-testing.139383/#post-1515344

    Remember, the car has two spark plugs per coil, so you won't easily see spark by just disconnecting a wire, spark will go through the other plug.

    [​IMG]

    The failure mode of crank sensor is often that it seems to slowly die, failing only when hot. The first clue would be thinking about how your car went from running to not.

    In the car, if you have a helper to turn the key and crank the engine, you can monitor the output of the sensor at the DIS ignition module pin #4 with a meter. There should be 12v pulses on the PIP:

    [​IMG]

    Also there, one can see if the ignition module is getting the SPOUT signal from the ECU, and if the coil fire pulses are being sent.

    There is a second PIP signal sent by the CKP to the ECU, you'd have to backprobe the ECU connector or use a breakout box to monitor there.
     
    sperold, SHOrod and zoomlater like this.
  3. BaySHO Performance

    BaySHO Performance SHO Member

    Joined:
    Feb 25, 2001
    Messages:
    425
    Likes Received:
    374
    Location:
    SF South Bay
    Home Page:
    First off, pull the codes and see if you have a 14 or a 211. Both would indicate a PIP circuit failure, indicating a bad CPS. Most likely cause is the water pump leaking on it, shorting it out. I've never known a CPS to 'slowly die'. the car stalls as soon as it gets wet:

    http://wiki.wikisho.com/wiki/EEC_Self_Test_Procedure

    If no codes, run the Probst DIS tests. DIS Test P1.jpg DIS Test P2.jpg
     
    SHOMON and sperold like this.
  4. tompumped

    tompumped SHO Member

    Joined:
    Jan 14, 2006
    Messages:
    737
    Likes Received:
    141
    Location:
    VT
    Diagnostic flow charts are the easiest way to properly determine whats really happening. A breakout box and IIRC an evtm is the way to go, but the procedure was posted above.

    The one huge factory Ford manual I got covers all 1992 fords and is filled with disgnostic flow charts. It makes it so simple anyone can do it.
     
  5. Harp96sho

    Harp96sho New Member

    Joined:
    Apr 12, 2019
    Messages:
    8
    Likes Received:
    18
    Gender:
    Male
    Location:
    Linglestown, PA
    You can also monitor the MIL while cranking. If the MIL turns off during cranking, it is "happy" and sees the signal from the crank sensor. It looks at other things as well, but that would be a clear indicator if it is working.
     

Share This Page

If you wish to help keep SHOforum running, please click the donation button below