1. Join the Community!

    DSMtuners is a massive archive of DSM information - but more importantly, it's a COMMUNITY! Join in and participate with other DSMers, and invite all of your DSM friends to make this place their home. Chat with others, create a build thread, post questions and answers. Get involved! Logging in will also remove many of the advertisements, along with this notice. ;)

2G 90-96 Cam Angle Sensor test help needed.

Posted by DiscipleX, Jun 28, 2020 at 5:56 PM

Please Support ExtremePSI
Please Support STM Tuned
  1. DiscipleX

    DiscipleX Probationary Member

    7
    0
    Joined Oct 19, 2018
    Speculator, New York
    So my 95 eclipse GSX has had engine cutout on and off recently while on the road, and now it wont start at all. No spark, no fuel. My research suggests to check the Cam angle sensor (Cam), then the Crank Position sensor, then finally send the AEM engine management system (ems) back to be checked. I'm a little bit new to electrical diagnostics, and was wondering how to check the Cam sensor using the multimeter. Does anyone know how to run these tests? The only diagnostics tests I'm able to find are for the 97-99 Cam position sensor under the cam gear for later models.
    upload_2020-6-28_18-55-37.png
     
  2. ThunderChild

    ThunderChild Supporting VIP

    2,942
    1,007
    Joined Jan 5, 2012
    Rathdrum, Idaho
    I'd just turn the key on and spin the CAS sensor to see if the injectors click.

    Otherwise once you find the signal wire, spin the sensor and look for fluctuating voltages as it spins.
     

    Street Build 705  3

    1990 Plymouth Laser N/T
    fwd · manual · 1G DSM

    690  8

    1987 Toyota Pickup/Hilux
    awd · manual · Misc Vehicles

    Street Build 1K  7

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

    2K  0

    1992 Eagle Talon TSi AWD
    manual · 1G DSM

    Street Build 3K  10

    1992 Eagle Talon TSi AWD
    awd · manual · 1G DSM
    Loading...
  3. boostdawd

    boostdawd Supporting Member

    1,182
    324
    Joined Apr 6, 2010
    phoenix, Arizona
    The type of sensor u have is a 1g CAS. It provides both the crank and cam signal. Search how to test cas and you will come across a few threads on how to test.
     

    Street Build 1K  1

    1997 Eagle Talon TSi AWD
    awd · automatic · 2G DSM

    Drag Race Build 4K  10

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  4. TK's9d2TSi

    TK's9d2TSi Supporting Member

    3,075
    1,191
    Joined Sep 11, 2017
    Cincinnati, Ohio
    Isn’t that a 90 cas?
     

    379  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    409  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 3K  6

    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
    Loading...
    steve likes this.
  5. Widgmaster

    Widgmaster Supporting VIP

    102
    198
    Joined Aug 24, 2018
    Sarnia, ON, Canada

    55  1

    1977 Glastron Aqua Lift
    awd · automatic · Misc Vehicles

    97  1

    2002 Dodge Dakota Extended Cab
    rwd · automatic · Misc Vehicles

    270  10

    2001 Mitsubishi Eclipse Spyder GT
    fwd · automatic · Misc Vehicles
    Loading...
  6. DiscipleX

    DiscipleX Probationary Member

    7
    0
    Joined Oct 19, 2018
    Speculator, New York
    Thanks for the help guys, I was able to find this forum post - https://www.dsmtuners.com/threads/how-to-test-1g-cas.394020/

    and followed goffers instructions. The CAS is pulsing like its supposed to when its rotating (4 pulses for the CAM) (2 pulses for the TDC wire). I didn't hear any fuel injector click during the test.

    When I took the CAM sensor off it was held on by only one loose bolt, I suspect maybe it got mal-adjusted by the vibration of the engine, I'm going to test it when I get home tonight, although I don't think that's the issue.

    Its probable that the AEM Engine management computer is fried, since I had the problem, the battery has inexplicably ran dead, the radiator fan relay has been buzzing, and the radiator fan will constantly turn when the key is turned to on.
     
    Last edited: Jun 29, 2020 at 1:16 PM
  7. DiscipleX

    DiscipleX Probationary Member

    7
    0
    Joined Oct 19, 2018
    Speculator, New York
    Took the AEM EMS out and took it apart, everything looks okay in there, no burns or broken terminals. I have no idea where to look next. Checked the CAS, which doubles as a Crank position sensor and it appears fine, checked the CAS wiring harness, checked the EMS.

    Any suggestions where to look next?
     
  8. luv2rallye

    luv2rallye DSM Wiseman

    7,610
    620
    Joined Jun 7, 2003
    Minneapolis, Minnesota

    3K  0

    1999 Mitsubishi Eclipse GST
    14.200 @ 95.000 · 2G DSM
    Loading...
  9. DiscipleX

    DiscipleX Probationary Member

    7
    0
    Joined Oct 19, 2018
    Speculator, New York
    I took the plug out, connected it to the spark plug wire, touched it to a ground at night so I could see if there was a spark, had someone crank it over. No spark, but I wasn't satisfied with that, so I took a test light, grounded it to the battery, and touched the the probe inside the spark plug wire and cranked, no test light either. Working on isolating the parasitic power draw now, as it might be connected.

    Researching power transistors now, thanks for the tip

    update: car is using 12 volts while key is off. there must be a short somewhere - also, transistor has 7 pins, not sure if that's normal
     
    Last edited: Jun 30, 2020 at 3:01 PM
  10. steve

    steve DSM Wiseman

    12,858
    633
    Joined Feb 3, 2002
    Boulder, Colorado

    2

    2008 Audi TT 3.2 Quattro Roadster
    awd · manual · Misc Vehicles

    4

    2002 Audi TT Quattro Roadster 225
    awd · manual · Misc Vehicles

    23  2

    1992 Dodge Stealth RT/TT
    awd · manual · 3000GT/Stealth

    4K  12

    1991 Mitsubishi Eclipse GSX
    manual · 1G DSM
    Loading...
  11. DiscipleX

    DiscipleX Probationary Member

    7
    0
    Joined Oct 19, 2018
    Speculator, New York
    Well, the car is running, I'm very confused as to why. I took every fuse and relay out I could find testing for the battery parasitic draw. Turned out it was a combination of the sunroof that doesn't open and the new gauge I just installed. Put everything together and now its running. puzzling since I didn't change anything.

    The only thing I can think of is the alternator was drawing some current, but now it doesn't seem to be doing it anymore and the car is running. Might need to get a new alternator just to be on the safe side.
     

Share This Page

Support Vendors who Support the DSM Community
ECM Tuning ExtremePSI Feal Suspension Fuel Injector Clinic Jacks Transmissions JNZ Tuning Kiggly Racing Morrison Fabrications OHM Racing RixRacing RockAuto SouthBay Fuel Injectors STM Tuned Track Decals Track Sculptures VR Speed Factory