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Thread: Not all PIDS are reading

  1. #1
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    Default Not all PIDS are reading

    Hello,

    I recently installed a 2000 LQ4 into my Chevelle. I have continuity from the sensor to the computer. The wires are in the correct computer connector locations but I am not getting some of my PIDS to work.

    ECT reads -40
    IAT reads -40
    LTFT Bank 1 reads -100 all the time but Bank 2 works fine.

    The electric fans seem to kick on when the engine warms ups but the low speed comes on once the engine is started. I set the on temp of 85C.

    I ohmed the ECT and it was perfect.
    I swapped the O2 and it did not follow.

    Can you please help me?

  2. #2
    Joe (Moderator) joecar's Avatar
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    EAT and IAT showing -40*F indicates that their signal wire is open circuit.

    LTFT1 pegged at -100% indicates PCM problem.

    You have a short in your fan wiring, or PCM problem; can you show me your wiring diagram.

    ( note: a short in the wiring may or may not cause PCM problems )

  3. #3
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    That is typically also lack of communication with the PCM.

    Does the vehicle actually start?
    "All that is needed for the triumph of evil is that good men do nothing..."

  4. #4
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    Quote Originally Posted by redtacoma31 View Post
    Hello,


    LTFT Bank 1 reads -100 all the time but Bank 2 works fine.




    Can you please help me?
    Is that in all fuel trim cells or only cell #22?
    97 Vette 6spd, CamMotion Titan2 LS1 cam, TSP 5.3 StageII heads, Vararam intake, Z06 manifold, ARH headers/cats, Z06 catback, Monster Stage2 clutch, 04 Z06 pcv, new style knock sensor(late98 to 04).

    Using FlashScan V1 with NGK-AFX Wide band

  5. #5
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    I was trying to log data in V8. I used the V7.5 Scan tool and figured it out. Everything works like it is suppose to.
    Thanks for the help. Just a newbie here trying to learn.

  6. #6
    Joe (Moderator) joecar's Avatar
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    no worries.

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