chienliu1972
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« on: July 28, 2011, 02:13:42 AM »
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My car is 2003 sharan 1.8t AWC with automatic 5 gears box. my ecu has been remapped by a service supplier in Taiwan. They gave several version of remapped software. However, they advised that only the boost had been remapped in these versions’ software.
Now the car would lock the automatic gearbox in 4th gear when I step full acceleration pedal. The error code show as,
Address 01: Engine
Control Module Part Number: 06A 906 032 HA
Component and/or Version: 1.8l R4/5VT AG5 G 4166
Software Coding: 00004
Work Shop Code: WSC 00000
Additional Info: WVWZZZ7MZ3V045770 VWZ1Z0C2400287
1 Fault Found:
17553 - Mass Air Flow Sensor (G70): Short to Plus
P1145 - 35-10 - - - Intermittent
Readiness: 0000 0000
Address 02: Auto Trans
Control Module Part Number: 09B 927 750 F
Component and/or Version: AG5 Getriebe 09B 0201
Software Coding:
Work Shop Code:
1 Fault Found:
01166 - Engine Torque Signal
16-10 - Signal Outside Specifications – Intermittent
I watch the Group 115, item-3(specified boost) & item-4(actual boost). When light loading with slight acceleration pedal, these two boost would 990 mbar and1040 mbar. When the car climb the slight hill, the boost would be 990 mbar and 1260 mbar. When the car clime the high hill with full throttle, the boost would be 1450 mbar and 1450 mbar.
Why the actual boost can not follow the specified boost in the slight acceleration pedal? What kind of parameter been adjusted would cause the above DTC 17553? I believe the DTC 01166 is cause by ECU 17533, due to my car is fitted with automatic gearbox.
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RaraK
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« Reply #1 on: July 28, 2011, 08:24:08 AM »
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Fix the fault code for one and rerun the test, its hard to tell you when you have a MAF issue with the vehicle.
But, the values are not that far off to be concerned with, the first hill scenario is a little bit out, but it also depends where in the rpm's you are. I would post up the vagcom log that you got with the values to better see if you in fact have issue with req/actual boost. They will not be exact! but close!
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chienliu1972
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« Reply #2 on: July 29, 2011, 01:09:14 AM »
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I put the log file as attached. In light loading of engine, the req/act. boost would have 150 mbar difference. In full acceleration throttle, the req/act. boost would have 200mbar difference.
Before my ECU being remapped, the req/act. boost is almost the same. After the ECU being remapped, the torque is better than before. However, the ECU would have MAF error code and influence the TCM to lock the automatic gearbox in 4th gear.
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RaraK
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« Reply #3 on: August 01, 2011, 11:47:28 AM »
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Hmm, well maybe the tuner forgot to edit some maps that are related to torque pemissable and automatic gearbox.
Who is tuner? do you have a readout of file, if you do i can take a look.
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chienliu1972
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« Reply #4 on: August 13, 2011, 07:49:12 PM »
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How to clone the ECU software from A car to B car? Due to the checksum and IMMO is different, is it possible to clone the software directly?
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chienliu1972
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« Reply #5 on: October 05, 2011, 06:37:17 AM »
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The attached BIN file would make the car get the above DTC. Alway MAF error code occurs, then lock the automatic gear box in 4th gear. Could anyone kindly advise the possible reason?
This file also being restricted in uploading, when I try to use MefMoto for uploading the flash.
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diagnosticator
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« Reply #6 on: May 15, 2012, 07:39:09 AM »
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When the MAF error DTC occurs, this causes the transmission to lock in 4th gear because the MAF (Mass Air Flow) is used by the ECU to determine the engine load. Since the ECU sends the engine load value to the TCU for use determining the gear shift strategy, without the load value from the ECU, the TCU cannot determine the correct shift points to use, so the TCU locks in mechanical 4th gear limp home mode. The "intermittent Short to Plus" DTC from the MAF meter must be fixed, to stop the TCU locking in mechanical 4th gear limp home mode. Also, the MAF signal value is the engine load value, so the boost pressure requested vs the actual boost pressure is effected by the occurrence of the MAF DTC.
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lulu2003
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« Reply #7 on: May 15, 2012, 11:26:23 AM »
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that shortcut to plus sounds like MAF maxed out -> 5V all the time.
manual shifter do not care about that.
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