maxXAM
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« on: February 04, 2023, 03:47:38 PM »
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17964 - P1556 Charge pressure control; negative deviation. HELP please
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« Last Edit: February 04, 2023, 04:23:26 PM by maxXAM »
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_nameless
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« Reply #1 on: February 04, 2023, 07:21:27 PM »
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17964 - P1556 Charge pressure control; negative deviation. HELP please
With zero relevant info... |
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If you are in the market for a tune and would like the ease of downloading and flashing a dyno tested tune for a fair price check out https://instatune.sellfy.store/ |
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nyet
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« Reply #2 on: February 04, 2023, 11:13:17 PM »
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« Last Edit: February 04, 2023, 11:38:27 PM by nyet »
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maxXAM
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« Reply #3 on: February 05, 2023, 02:46:17 PM »
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i had this issue about week now with no fault codes stored on ecu and my boost guage won't pass 5 psi with no check light on,a friend of mine told me to get hard on my s4 get it under load its will throw codes i take my s4 for spin on highway i hit the gas on 3th gear full throttle suddenly check engine turned on when get to my home pluged in vagcom scanned for cods i found this code 17964 - P1556 Charge pressure control; negative deviation
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nyet
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« Reply #4 on: February 05, 2023, 02:47:40 PM »
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n75, wg lines, wg.
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maxXAM
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« Reply #5 on: February 05, 2023, 03:13:02 PM »
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n75, wg lines, wg.
so this code means over boosting or under boost if over boosting this drive me to start checking boost control starting from n75 to wastegates |
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nyet
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« Reply #6 on: February 05, 2023, 06:33:24 PM »
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overboost -> limp -> limited to 5psi
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maxXAM
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« Reply #7 on: February 06, 2023, 03:12:24 PM »
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Good news i fixed it
now my s4 hits 20psi again
The check valve that connected between the intake manifold and evap valve was connected backwards
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prj
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« Reply #8 on: February 07, 2023, 05:12:58 AM »
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Everyone loves some boost in their fuel tank.
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nyet
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« Reply #9 on: February 07, 2023, 11:18:13 AM »
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Everyone loves some boost in their fuel tank.
I'm trying to figure out how this led to neg deviation though |
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prj
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« Reply #10 on: February 07, 2023, 11:26:09 AM »
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I'm trying to figure out how this led to neg deviation though If it was 10 years ago when I had the 2.7T hoses memorized in my head, I'd tell ya. |
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maxXAM
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« Reply #11 on: February 07, 2023, 11:50:42 AM »
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I'm trying to figure out how this led to neg deviation though
 that's me, now i know why i smell gas on my s4 capin |
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phila_dot
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« Reply #12 on: February 07, 2023, 06:37:10 PM »
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I'm trying to figure out how this led to neg deviation though
P1556 is LDRA. lde > EDLDRP and lditv_w >= TVLDMX for TDLDRA |
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nyet
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« Reply #13 on: February 07, 2023, 09:19:23 PM »
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P1556 is LDRA.
lde > EDLDRP and lditv_w >= TVLDMX for TDLDRA
Yep, that's overboost... but why did the checkvalve error produce overboost? |
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phila_dot
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« Reply #14 on: February 08, 2023, 03:49:19 PM »
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lde > EDLDRP
Actual boost is at least EDLDRP less than target lditv_w >= TVLDMX
Max DC is unable to correct the error |
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