Vauxhall Astra H 1.7CDTi Z17DTH 2007 - Code P2279-11 air leak inlet manifold #
Posted by Malc Morley on February 27, 2012, 11:18 am
Year of Manufacture *: 2007 Engine Size and Code *: 1700 Z17DTH ( Optional ) ECU Type: Bosch EDC16 / 0 281 012 694 ( Optional ) Scanner Used: Vauxcom with latest updates ( Optional) Fault Codes: P2279-11
Astra H 1.7 CDTI 2007 Z17DTH engine, EDC16, Bosch No. 0 281 012 694, ECU under n/s wheel arch.
Fault code P2279-11 air leak in inlet manifold
Vehicle good starter, runs well no problems, as long as you drive steady.
Accelerate vehicle hard no problem until you back off throttle, fault code is set after 5 to 7 seconds, vehicle goes into limp home mode, this occurs each and every time.
Pressure tested intercooler to 15 lb pressure no leaks, smoke tested inlet manifold etc.
Removed swirl flaps, checked them, all ok.
Checked valve timing all ok.
Parts fitted by PREVIOUS garages, reconditioned turbo then new turbo, new EGR valve, I have tried blanking off new EGR no difference.
Tested map sensor, ignition on, engine not running / engine running. If you remove sensor and apply steady pressure with a pump to sensor, the voltage rises smoothly up to about 4.25 volts measured on live data and on oscilloscope.
Reading live data, once map sensor VOLTAGE reaches about 2.3 volts the engine ECUs interpretation of pressure goes all to pot, flying straight up to 3bar. If you remove pressure from sensor, PRESSURE reading in live data hangs at 3bar for 5 to 7 seconds then crashes to zero.
Voltage shown on diagnostics dose not hang but drops to zero when pressure released.
If you simulate a voltage from sensor to ECU, any voltage below 1.7 volts causes ECU to read 3bar and any voltage above 2.3bar dose the same, in between these all ok.
Have tried a new sensor, rewired sensor back to ECU, same condition, checked 5 volt feed, earths, etc. all ok. ECU main supply and earths all ok.
Fitted a replacement ECU, had ECU reflashed latest software, no change.
Have tested Map sensor on several other Vauxhalls but not the exact same model, no other vehicle behaves like this, all others, as voltage rises pressure indicated on diagnostic tool rises and dose not hang.
My thoughts are still a faulty ECU, would like try ECU in another vehicle but cannot find same vehicle, Have run out of ideas, has anyone got any.
If anyone has same model would you be prepared to test this ECU in their vehicle. No ECU testing firm will check this ECU.
Malc Morley
Re: Vauxhall Astra H 1.7CDTi Z17DTH 2007 - Code P2279-11 air leak inlet manifold #
P2279 The control unit recognises a mechanical malfunction of the following component via an internal evaluation logic: Intake system
The following test steps must be performed in the given order. If a fault is found in one test step, the subsequent test steps can be skipped. Function Checks •Verify mechanical system functions/components Intake system Check intake system/charge air hoses for leaks (secondary air, porosity and blockages) Check the hose clamps at the intake-air system / charge-air system for correct fitting. Check connected hoses and tubes for kinks, damage etc. Check air filter for fouling and correct mounting. Check air mass meter for fouling. Exhaust-gas turbo charger Exhaust system Refer to Table B-023 Check: Vacuum Supply System Read and (if applicable) apply Field Remedy 1779 Actuator Tests •Select the following Functional System: Electronic Diesel Injection System EDC 16C9, Z 17 DTL, Z 17 DTH •Perform the following Actuator Tests: Refer to Table B-014 ACTUATOR TEST T001 EGR Solenoid Test (Below):
Work Order Description Nominal Value •Ignition ON •Engine idling
•Press corresponding key in the system main menu to call up Actuator-Test functions, select the desired test and confirm with ENTER . Follow the instructions in the diagnostic tester display. •After the test is started, the corresponding component can be actuated using the soft keys.
•Press soft key INACTIVE Mass air flow sensor signal is greater than 35 kg/h •Press soft key ACTIVE Mass air flow sensor signal is less than 35 kg/h Note: To protect the component, the duration of the actuator test is limited. Concerned Terminals: ECM: 9, 34, 51, 57 (XC11) Reply to:
Re: Vauxhall Astra H 1.7CDTi Z17DTH 2007 - Code P2279-11 air leak inlet manifold #
We had a 2005 astra with the same engine in today with the exact same code pulled using our kts, seems as though the symptoms are the same aswell. If we went over 3k rpm and then backed off the car would put the eml light on and go into 'limpmode' immediately, if we drove steady it was fine. From watching live data on our road test it looked as if the EGR valve was sticking but we didnt look any deeper into it.
Re: Vauxhall Astra H 1.7CDTi Z17DTH 2007 - Code P2279-11 air leak inlet manifold #
Thanks Nick for your reply. On this Astra blanking off the EGR made no difference and in live data it appeared ok.
Tested car as per TIS cannot find any thing out of place.
Very strange how the engine interprets its manifold pressure, if vehicle isn’t moving you cannot substitute a voltage into the Map sensor and get a sensible reading i.e. a voltage under 1.7 volts reads in live data 3bar, 1.8 volts (atmospheric pressure) to 2.2 reads ok, 2.3 volts 3bar very strange. Wish I understood how this system works?
Re: Vauxhall Astra H 1.7CDTi Z17DTH 2007 - Code P2279-11 air leak inlet manifold #
Seen this a few times and the first time i jumped in to deep thinking sensor, wiring, or ecu and it ended up being the inlet manifold and intake pipes from egr jammed full of carbon.
Re: Vauxhall Astra H 1.7CDTi Z17DTH 2007 - Code P2279-11 air leak inlet manifold #
Mark - did you ever bottom this one? I have an Astra 1.9 Z19DTH late 2005 and have exactly the same problem, having had all the same parts fitted and still get the code when you back off the throttle, so did you ever have a fix on this???
on February 27, 2012, 9:30 pm, in reply to "