The ecu won't give info when car is off , what are those readings when you switch the ign on engine off? Also what are the readings giving for aap and iat with eng cold ign on engine off, has it had recent head work?
Ive been trying to chase down low boost pressure on my TD5 D2a and have just noticed something strange.
On my nanocom it shows the boost pressure as -0.4 bar which rises to 0.7bar, I had figured the -0.4 was die to little or no boost pressure and the engine actually drawing a partial vacuum, but I've noticed that this -ve pressure will remain despite the engine being turned off, when I would expect the pressure to return to ambient.
Is this normal, does teh ECU stop updating the pressure when the engine is off, or is this indicative of a faulty sensor?
The ecu won't give info when car is off , what are those readings when you switch the ign on engine off? Also what are the readings giving for aap and iat with eng cold ign on engine off, has it had recent head work?
aap iat???
define 'off' I mean with engine off, but the ECU is still powered up, and I still see -0.4 bar when I turn the ign on and it remains at 0.4 bar until I start driving, then I can get to 0.7 bar, or 0.9 if I adjust the wastegate pushrod...didnt want to adjust it any more than that
I'm not aware of the car having any recent head work, but I've only had it for 6 weeks
aap = ambient air pressure
iat = intake air temperature
hi see attatched, I've also logged some data on the nanocom and plotted it in reference to the Garret turbo compressor map
corrected map
heres some of the raw data from the nanocom
Engine speed (rpm) Road speed Coolant temp. (C) Turbo pres. (Bar) Battery volt. (V) Ambient pres. (kPa) Air flow (g/s) Air inlet temp. (C) Fuel temp. (C) Cyl. 1 Cyl. 2 Cyl. 3 Cyl. 4 Cyl. 5 Accel. track 1 (V) Accel. track 2 (V) Accel. track 3 (V) Accel. supply (V) EGR inlet (%) EGR mod. (%) Idle speed error Wastegate mod.(%) air flow pressure ratio 2665 61 86.5 0.73 13.88 99.2 382 55 67.1 1 1 1 -1 -3 2.51 2.608 3.128 5.02 36.45 0 1856 36.66 50.52995 1.743951613 2716 63 84.5 0.83 13.78 98.55 419.2 55.2 66.8 4 -5 2 1 -2 2.65 2.471 2.927 5.026 35.77 0 1967 35.9 55.45067 1.856925419 2826 66 84.5 0.94 13.94 98.29 457.5 55.5 66.5 4 4 -2 -2 -4 2.898 2.233 2.599 5.02 35.68 0 2055 35.68 60.51689 1.973751145 2856 68 84.5 0.91 13.88 98.29 455.5 55.7 66.4 4 4 -2 1 -4 2.834 2.296 2.687 5.02 35.63 0 2086 35.61 60.25234 1.94322922 2983 71 85 0.96 13.85 98.01 486.2 55.9 66 -5 6 7 0 -5 3.038 2.091 2.398 5.02 35.81 0 2219 35.81 64.31325 1.999795939 2880 73 84.5 0.75 13.97 99.33 399 56.2 65.9 1 4 1 -5 -1 2.483 2.641 3.171 5.02 36.66 0 1960 36.65 52.77867 1.761804087 2709 74 84.8 0.57 13.53 100.12 344.6 56.5 65.5 0 1 1 -1 0 2.085 3.029 3.719 5.02 0 0 1829 0 45.58278 1.568118258 2180 75 84.8 0.06 13.65 101.44 189.3 56.7 65.4 0 3 2 -4 -2 1.514 3.579 4.491 5.02 0 0 1128 0 25.0401 1.044952681 1702 75 85.4 -0.22 13.88 101.7 106 56.9 65 -2 1 4 0 -2 0.727 4.34 4.682 5.02 0 0 570 0 14.0214 0.766961652 1067 74 84.9 -0.33 13.91 101.58 69.5 56.9 64.8 -3 -1 4 1 -2 0.727 4.34 4.682 5.02 0 0 293 0 9.193276 0.659578657 1059 72 84.9 -0.37 13.94 101.7 66 56.9 64.5 -3 3 3 -1 -1 0.727 4.34 4.682 5.02 0 0 265 0 8.730306 0.619469027 1032 72 85 -0.37 13.91 101.83 64.9 56.9 64.5 -2 0 2 1 -2 0.727 4.34 4.682 5.02 0 0 247 0 8.5848 0.618678189 1026 73 85 -0.38 13.78 101.83 66.1 56.9 64.5 -1 0 2 0 -2 0.727 4.34 4.671 5.026 0 0 256 0 8.743533 0.6088579 1044 73 85 -0.38 13.85 101.7 66.5 56.9 64.5 1 -3 1 2 -1 0.727 4.34 4.682 5.02 0 0 263 0 8.796444 0.609636185 1036 72 85.4 -0.38 13.85 101.83 65.1 56.7 64.5 1 -3 1 2 -1 0.727 4.34 4.682 5.02 0 0 252 0 8.611256 0.6088579 1031 72 85.4 -0.38 13.88 101.83 67.5 56.7 64.6 2 -1 -1 0 1 0.727 4.34 4.682 5.026 0 0 246 0 8.928722 0.6088579 1014 71 85.8 -0.38 13.94 101.7 65.3 56.5 65 -1 2 -1 -2 3 0.727 4.34 4.682 5.026 0 0 225 0 8.637711 0.609636185 995 71 85.8 -0.38 13.62 101.44 102.5 56.5 65 -2 1 -4 4 4 1.788 3.318 4.119 5.02 31 0 919 30.6 13.55843 0.611198738 2134 73 85.8 0.01 13.43 100.79 226.8 56.2 65 1 1 -1 -2 -1 2.358 2.756 3.332 5.026 34.09 0 1500 34.04 30.0005 1.00208354 2429 75 85.8 0.45 13.85 100.52 318.7 56.2 65.5 2 1 -1 0 0 2.369 2.744 3.318 5.02 39.18 0 1648 38.95 42.15679 1.442499005 2202 78 85.8 0.19 13.72 101.31 222.6 56 65.5 1 -1 1 0 -1 1.809 3.289 4.094 5.02 30.62 0 1289 30.27 29.44494 1.174612575 2278 80 85.8 0.26 13.5 100.26 277.2 55.9 65.8 0 1 2 -3 0 2.358 2.762 3.332 5.02 33.43 0 1625 32.31 36.66728 1.256732496 2396 81 85.8 0.4 13.91 100.79 285.2 55.7 66 1 2 0 -2 0 2.101 3.01 3.698 5.02 38.77 0 1539 38.41 37.7255 1.389026689 2145 82 85.8 0.14 13.88 101.05 228.6 55.5 66.1 1 0 1 0 -1 1.891 3.216 3.987 5.02 0 0 1374 0 30.2386 1.128154379 1569 82 85.8 -0.21 13.94 101.58 129.5 55.2 66.1 -3 -1 1 2 1 1.228 3.858 4.682 5.02 0 0 950 0 17.12992 0.777712148 1397 80 85.5 -0.31 13.85 102.11 90.9 55.2 66.3 -1 3 -1 -1 0 0.732 4.34 4.682 5.02 0 0 488 0 12.02401 0.675741847 1237 79 85.5 -0.35 13.81 101.83 82.4 55 66.3 0 -2 1 2 -1 0.732 4.34 4.682 5.026 0 0 436 0 10.89965 0.638318767 1174 77 85.5 -0.36 13.91 101.83 77.4 54.9 66.3 -1 0 2 1 -1 0.775 4.301 4.682 5.02 0 0 380 0 10.23827 0.628498478 2006 75 85.1 -0.15 13.91 101.31 186.8 54.7 66.3 0 0 1 -1 -1 2.095 3.016 3.698 5.026 32.79 0 1350 32.52 24.70941 0.839008982 2243 77 85.4 0.13 14 101.18 241.8 54.5 66.3 2 -2 0 -3 1 2.042 3.068 3.782 5.026 37.13 0 1445 36.86 31.98466 1.116821506 2104 77 85.1 0.06 13.97 101.18 212.8 54.2 66.5 0 -1 3 2 -1 1.88 3.227 4.006 5.02 31.7 0 1326 31.46 28.14862 1.047637873 2349 77 85.1 0.26 13.91 100.91 261.7 54.2 66.5 1 2 0 -1 -1 2.025 3.085 3.806 5.02 0 0 1472 0 34.61698 1.2486374 2132 77 85.1 0.14 13.91 101.05 246.6 54 66.5 1 1 -1 0 2 2.23 2.881 3.513 5.02 33.58 0 1520 33.25 32.6196 1.128154379 2300 77 84.9 0.28 13.85 100.66 273.6 54 66.6 -2 1 1 -2 1 2.23 2.887 3.519 5.026 37.58 0 1548 37.34 36.19108 1.271607391 2319 77 84.9 0.32 13.94 100.52 281.5 53.7 66.6 1 -1 1 -1 0 2.279 2.835 3.44 5.02 40 0 1576 40 37.23608 1.313171508 2337 75 84.9 0.33 13.85 101.31 275.7 53.7 66.6 0 0 1 -1 0 1.972 3.135 3.875 5.02 0 0 1471 0 36.46887 1.31280229 1459 74 84.9 -0.21 13.97 101.7 95.4 53.4 66.6 0 2 25 -1 -2 1.243 3.845 4.682 5.02 30.69 0 702 30.29 12.61926 0.776794494 1952 71 84.5 -0.18 13.94 101.7 112.9 53.2 66.6 -1 3 3 -3 -2 0.732 4.34 4.682 5.02 0 0 566 0 14.93411 0.806293019 1078 67 84.5 -0.33 13.85 101.97 67.1 53 66.6 0 1 -2 -2 3 0.727 4.34 4.682 5.02 0 0 201 0 8.875811 0.657055997 822 61 84.5 -0.37 13.81 101.58 51.5 53 66.6 -4 5 -3 0 -6 0.727 4.34 4.682 5.026 0 0 40 0 6.812284 0.620200827 788 53 84.3 -0.38 13.85 101.7 47.9 53 66.6 -4 4 1 -1 0 0.727 4.34 4.682 5.026 0 0 -18 0 6.336085 0.609636185 745 45 84.3 -0.39 13.91 101.7 46 52.7 66.6 -4 5 1 -2 -4 0.732 4.34 4.682 5.02 0 0 -17 0 6.084758 0.599803343 756 38 84.3 -0.39 13.94 101.58 45.2 52.7 66.6 -3 3 0 0 0 0.732 4.34 4.682 5.02 0 0 -35 0 5.978937 0.600511912 750 33 84.3 -0.39 13.91 101.58 64.8 52.7 66.5 22 21 -18 -21 -48 1.858 3.25 4.032 5.02 0 0 416 0 8.571573 0.600511912 1759 31 84.3 -0.22 13.69 101.31 154.6 52.7 66.6 -1 -1 1 -1 2 2.806 2.319 2.717 5.02 31.93 0 1109 31.56 20.45008 0.769914125 2084 33 84.5 0.06 13.65 100.52 217.8 52.7 66.9 0 0 3 -1 0 2.924 2.204 2.556 5.02 35.74 0 1353 35.99 28.81001 1.054516514 2466 35 84.5 0.68 13.85 98.01 411.6 52.5 67 -2 1 1 -2 2 2.92 2.204 2.561 5.02 35.59 0 1961 35.56 54.44536 1.714110805 2727 40 84.5 0.79 13.91 99.08 408.3 52.4 67 1 0 2 -2 -1 2.536 2.585 3.098 5.026 36.54 0 1880 36.52 54.00884 1.806620912 2702 46 85 0.74 13.75 98.8 399.3 52.4 67.1 1 4 0 -6 1 2.467 2.654 3.186 5.02 36.97 0 1932 36.97 52.81835 1.761133603 2736 49 84.5 0.66 13.91 99.87 356.8 52.4 67.1 0 2 0 -1 -1 2.44 2.676 3.23 5.02 40 0 1706 40 47.19656 1.662160809 2315 52 84.3 0.43 13.59 100 302.2 52.4 66.3 1 2 2 -3 -1 2.342 2.766 3.362 5.02 36.45 0 1592 36.75 39.97422 1.43 2548 56 84.3 0.78 13.97 98.41 412.2 52.5 67.1 1 0 1 1 -4 3.114 2.017 2.292 5.026 35.63 0 1935 35.63 54.52473 1.808759272 2779 60 84.5 0.93 13.78 98.29 451.2 52.5 67.1 3 -1 -1 -3 0 2.865 2.267 2.644 5.02 35.65 0 2005 35.65 59.68354 1.96357717 2779 64 84.3 0.9 13.94 98.55 439.7 52.9 67 4 1 1 -4 -4 2.828 2.302 2.697 5.02 35.68 0 2027 35.68 58.16235 1.927955353 2798 68 84.3 0.86 13.94 98.8 417.3 53.2 66.8 5 1 1 -3 -4 2.714 2.408 2.849 5.02 35.77 0 2003 35.77 55.19934 1.882591093 2808 71 84.3 0.88 13.88 98.41 437.3 53.5 66.5 4 4 -3 -3 -6 2.742 2.387 2.815 5.02 35.79 0 2054 35.79 57.84489 1.910374962 2707 73 84.3 0.8 13.91 99.47 394.6 54 66.4 -1 1 1 -1 -3 2.645 2.477 2.941 5.02 37.7 0 1831 37.45 52.19665 1.809590831 2351 75 84.5 0.42 13.56 100.66 275.6 54.5 66 -2 2 2 -3 0 2.121 2.989 3.664 5.026 40 0 1473 40 36.45564 1.41068945 2161 77 84.3 0.17 13.75 100.91 227.8 54.9 65.9 1 -1 2 -2 0 1.998 3.108 3.835 5.02 40 0 1369 40 30.13278 1.159449014 2170 77 84.5 0.14 13.94 100.91 227.6 55 65.5 1 0 1 -1 -2 2.015 3.096 3.816 5.02 40 0 1386 40 30.10633 1.129719552 2145 78 84.5 0.12 13.78 101.18 216.6 55.4 65.5 0 -1 2 0 -2 1.95 3.153 3.905 5.02 40 0 1352 40 28.65128 1.10693813 2081 79 84.8 0.05 13.94 101.44 200.8 55.5 65.4 0 -2 1 1 -1 1.842 3.26 4.056 5.02 0 0 1296 0 26.56129 1.035094637 2065 79 84.8 0 13.88 101.58 197.1 55.5 65.1 -1 -2 1 1 1 1.794 3.312 4.119 5.02 0 0 1275 0 26.07187 0.984445757 1983 80 84.8 -0.07 13.94 101.83 174 55.5 65 -3 1 0 -2 -1 1.636 3.46 4.329 5.02 0 0 1135 0 23.01626 0.913286851 1887 80 84.8 -0.15 13.88 101.7 161.1 55.5 65 0 0 1 0 -1 1.577 3.523 4.418 5.02 0 0 1103 0 21.30988 0.835791544 1864 80 85 -0.17 13.85 101.58 155.6 55.5 65 0 3 0 1 -2 1.514 3.579 4.495 5.026 0 0 1084 0 20.58236 0.817089978 1859 80 85 -0.19 13.91 101.58 153.1 55.5 64.5 -1 2 1 -1 -1 1.449 3.648 4.584 5.02 0 0 1072 0 20.25166 0.797401063 1445 79 85 -0.3 13.94 101.97 97.6 55.2 65 0 1 0 -2 1 0.732 4.34 4.682 5.02 0 0 586 0 12.91027 0.686476415 1287 78 85 -0.35 13.91 101.97 87 55.2 65 -2 3 0 -3 2 0.732 4.34 4.682 5.02 0 0 478 0 11.50813 0.637442385 1222 77 85 -0.36 13.91 101.83 82 55 65 -1 3 0 -2 1 0.732 4.34 4.682 5.026 0 0 426 0 10.84674 0.628498478 1178 75 85.4 -0.37 13.91 101.97 77 54.9 65.3 -2 2 2 0 -1 0.732 4.34 4.682 5.02 0 0 386 0 10.18536 0.617828773 1142 75 85.4 -0.37 13.85 101.83 75.3 54.7 65.3 -1 1 1 1 -1 0.732 4.34 4.682 5.02 0 0 348 0 9.960485 0.618678189 1104 74 85.4 -0.37 13.91 101.97 72.8 54.5 65.5 0 2 0 -1 0 0.732 4.34 4.682 5.02 0 0 310 0 9.629792 0.617828773 1059 72 85.4 -0.38 13.91 102.11 68.1 54.5 65.5 -7 -4 2 7 2 0.732 4.34 4.682 5.02 0 0 257 0 9.008088 0.607188326 1056 71 85.4 -0.37 13.94 101.58 112 54.4 65.8 -1 -1 -2 4 4 1.454 3.641 4.573 5.026 0 0 867 0 14.81506 0.620200827 1759 71 85.4 -0.22 13.88 101.7 148.1 54.2 66 -2 4 0 1 -3 1.508 3.591 4.506 5.026 0 0 981 0 19.59028 0.766961652 1760 70 85.4 -0.19 13.69 101.58 150.8 54 66 -1 4 -1 1 -2 1.496 3.595 4.515 5.02 0 0 983 0 19.94743 0.797401063 1821 70 85.8 -0.14 14 101.7 162.6 53.7 66.1 0 -1 0 -1 1 1.697 3.408 4.251 5.02 0 0 1064 0 21.5083 0.845624385 1963 70 85.5 -0.05 13.59 101.58 187.8 53.7 66.3 1 1 0 1 -2 1.891 3.216 3.987 5.02 0 0 1200 0 24.84169 0.935223469 1993 70 85.5 0 13.88 101.31 194.8 53.4 66.5 1 1 0 0 -2 1.868 3.233 4.017 5.02 0 0 1208 0 25.76763 0.987069391 1985 70 85.5 0 13.81 101.31 194.3 53.2 66.6 0 -1 1 0 0 1.88 3.227 4.001 5.02 0 0 1215 0 25.70149 0.987069391 1984 71 85.5 0 13.69 101.31 193.1 53 66.9 0 -1 2 0 0 1.831 3.273 4.065 5.026 0 0 1201 0 25.54276 0.987069391 1958 71 85.1 -0.02 13.97 101.44 187 52.7 67.1 -1 1 0 -1 1 1.788 3.312 4.119 5.026 0 0 1170 0 24.73587 0.966088328 1948 71 85.1 -0.04 13.88 101.7 187.5 52.7 67.1 -1 1 0 0 0 1.794 3.312 4.125 5.02 0 0 1170 0 24.802 0.943952802 1972 71 85.1 -0.02 13.85 101.31 184.8 52.5 67.1 0 1 1 -1 0 1.809 3.295 4.099 5.02 0 0 1179 0 24.44486 0.967328003 1952 71 84.9 -0.03 13.91 101.58 185.6 52.4 67.1 -1 2 -1 0 1 1.778 3.329 4.144 5.02 0 0 1169 0 24.55068 0.954912384 2017 71 84.9 0 13.88 101.31 196.3 52.2 68.5 0 1 -1 -1 0 1.831 3.273 4.071 5.02 0 0 1229 0 25.96605 0.987069391 1989 71 84.9 0 13.97 101.58 195 52 67.3 1 0 0 1 0 1.809 3.295 4.099 5.02 0 0 1198 0 25.79408 0.984445757 2032 71 84.9 0.02 13.88 101.44 203.1 52 67.5 1 -1 0 0 0 1.965 3.141 3.88 5.02 0 0 1275 0 26.86553 1.005520505 2042 71 84.9 0.04 13.88 101.31 200.6 51.9 67.3 0 -3 1 0 0 1.911 3.198 3.963 5.02 0 0 1258 0 26.53484 1.026552167 1962 71 84.5 -0.02 13.94 101.44 181.6 51.9 67.3 -4 3 -1 3 -2 1.643 3.46 4.324 5.026 0 0 1101 0 24.02157 0.966088328 1776 71 84.5 -0.16 13.91 101.7 151.1 51.7 67.3 -3 3 0 0 0 1.465 3.63 4.565 5.026 0 0 984 0 19.98711 0.825958702 1740 71 84.5 -0.2 13.78 101.7 145.6 51.7 67.3 -3 4 0 0 0 1.411 3.676 4.632 5.015 0 0 954 0 19.25958 0.786627335 1725 70 84.5 -0.21 14.07 101.7 146.1 51.7 67.3 -1 3 -1 3 -3 1.562 3.533 4.433 5.02 0 0 1001 0 19.32572 0.776794494 1864 70 84.5 -0.15 13.97 101.7 159.6 51.7 67.3 -1 1 -1 0 0 1.589 3.51 4.402 5.026 0 0 1046 0 21.11147 0.835791544 1864 70 84.5 -0.13 13.88 101.31 167.1 51.5 67.3 -2 1 1 1 -1 1.643 3.46 4.329 5.02 0 0 1078 0 22.10355 0.85875037 1859 70 84.5 -0.13 13.97 101.7 161.8 51.4 67.3 -2 3 1 0 -1 1.594 3.506 4.393 5.02 0 0 1039 0 21.40248 0.855457227 1744 69 84.3 -0.18 13.91 101.7 148.1 51.4 67.3 -2 2 -1 1 0 1.432 3.658 4.607 5.02 0 0 952 0 19.59028 0.806293019 1709 69 84.3 -0.21 13.88 101.7 142 51.2 67.3 -2 3 0 2 -2 1.411 3.681 4.632 5.02 0 0 937 0 18.78338 0.776794494 1799 68 84.3 -0.17 13.94 101.7 153.3 51 67.3 -1 3 -2 1 -2 1.534 3.562 4.477 5.02 0 0 997 0 20.27812 0.81612586 1744 68 84.3 -0.19 14 101.7 147 50.9 67.3 -2 1 0 2 -2 1.449 3.641 4.584 5.02 0 0 953 0 19.44477 0.796460177 1712 68 84.3 -0.21 13.91 101.7 138.6 50.9 67.3 -3 1 -1 2 0 1.373 3.716 4.677 5.02 0 0 905 0 18.33364 0.776794494 1661 67 84.3 -0.23 13.53 101.7 134.3 50.7 67.3 -3 2 -1 1 1 1.32 3.766 4.682 5.02 0 0 867 0 17.76485 0.75712881
The fact it shows negative boost without eng running could be in the map sensor ( is it clean?), map wiring, or nanocom , it may even have a boost box fitted which won't give you true boost readings on nanocom, I don't know how much load was on the engine on that run but engine revs were never above 3000 rpm , it needs to be fully loaded maybe up a hill above 3000 to see max boost , and to be accurate, a dedicated boost gauge , how many threads can you count on the wastegate actuator?
I've take the MAP sensor out and cleaned it but no improvement, cant see a boost box anywhere they normally go by the ECU don't they?, I removed the ECU yesterday and definitely nothing there.
wastegate actuator shows 11 threads
Ill give it a better run later toady, but I'm really concerned about the low MAP reading if thats wrong then I dont know what harm can be done messing with the wastegate
was wondering if the Nanoncom file units were wrong and noticed that a lot of traces show the MAF units as g/hr (presumably kg/hr) not g/s, if I replot the data with this assumption it falls right in the zone.... but I still have the low pressure indication
Capture2.jpg
Try going to 9 threads , see what your reading is under full boost , you won't harm anything as the ecu has protection if it over boosts , if you have gone too far it will default to 1 bar max until you either clear the fault with nanocom or switch eng off and restart , if indeed you do have slight vacuum at idle it could be a number of things, worn turbo , sensors etc , without driving it its harder to say , was the problem( if there is one) there since you bought it?. Idle speed your AFM should show around 55 max revs/boost around 600-650 if standard, iat around 10 - 50 degrees above ambient depending on load /speed at operating temp
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