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Codes from Techstream- 3000 & 3120

Discussion in 'Generation 1 Prius Discussion' started by C Clay, Apr 26, 2015.

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  1. Patrick Wong

    Patrick Wong DIY Enthusiast

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    Since the 12V battery is dead, the engine ECU will revert to its default settings with regards to appropriate air/fuel mixture and ignition timing. If you install a good 12V battery, the engine ECU will be able to store its learnings with regards to those settings so that the engine will run more smoothly.

    The reason the engine ECU needs to learn is that over time, an engine may develop a slight air leak (for example, at the oil filler cap, the oil dipstick, or a loose PCV hose) allowing unmetered air into the engine which eventually will end up in the intake manifold given the PCV hoses. Or the fuel injectors may develop slight clogging which has the same net effect. In either instance the air/fuel mixture needs to be made richer to compensate. Or carbon deposits may build up in the combustion chambers which increase the effective compression ratio and require a change in engine ignition timing to compensate.
     
    #21 Patrick Wong, May 7, 2015
    C Clay likes this.
  2. bwilson4web

    bwilson4web BMW i3 and Model 3

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    What is the 12V voltage when car is running?

    A failed 12V inverter would not have the 13.8-13.9V needed.

    Bob Wilson
     
    #22 bwilson4web, May 7, 2015
  3. C Clay

    C Clay Member

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    Not sure, bought a battery though and it wants to still shutter. Can't really drive it yet because one of the brake lines suffered some damage in the tow I think. It's never leaked before but now suddenly won't hold brake fluid and leaks it all out. Now onto a separate issue.


    iPhone ?
     
    #23 C Clay, May 7, 2015
  4. C Clay

    C Clay Member

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    #24 C Clay, May 11, 2015
  5. AUTO2000

    AUTO2000 New Member

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    how can i read sub codes in techstream i had code p0A94 but there is 17 subcodes or inf codes with it i cannot find the exact code in techstream plz help
     
    #25 AUTO2000, May 18, 2017
  6. dolj

    dolj Senior Member

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    You'll find the sub-codes or INF codes in the freeze frame data. If there is freeze frame data, there will be a snowflake icon by the DTC. Click on the snowflake to go into the freeze frame view.
     
    #26 dolj, May 18, 2017
  7. WHCSC

    WHCSC Member

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    I'm having this issue now and tried the above tests. I jacked up the front (both tires off) with car in park and could not budge the crankshaft pulley even with the belt loose and using a big wrench. And then I did the second test by jacking up just the front right and spun the tire. The crank pulley spun. My question is, what does this tell me? Is my problem with MG1 or the ICE?
     
    #27 WHCSC, Aug 23, 2017
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