Waar vind ik snelheidssignaal (kabel) voor computer (LH2.4)

Hallo mede forummers,
Mijn 740 heeft al een tijdje last van foutcode 3-1-1, de computer krijgt geen snelheidssignaal door. Nu heb ik in de vakantie wel tijd om het probleem op te gaan lossen.
 
Weet iemand zo snel waar ik de storing het beste kan gaan zoeken, bij welke kabel? kleur?
De kilometerteller werkt verder prima, nooit problemen mee gehad in deze 740...
 
alvast bedankt!

Hey Alwood,
Hier een pin-layout van de LH2.4 ECU
 <table border="0"><tbody><tr><td>|</td> <td>1</td> <td>|</td> <td>2</td> <td>|</td> <td>3</td> <td>|</td> <td>4</td> <td>|</td> <td>5</td> <td>|</td> <td>6</td> <td>|</td> <td>7</td> <td>|</td> <td>8</td> <td>|</td> <td>9</td> <td>|</td> <td>10</td> <td>|</td> <td>11</td> <td>|</td> <td>12</td> <td>|</td> <td>13</td> <td>|</td> <td>14</td> <td>|</td> <td>15</td> <td>|</td> <td>16</td> <td>|</td> <td>17</td> <td>|</td> <td>18</td> <td>|</td></tr> <tr><td></td> <td>|</td> <td>19</td> <td>|</td> <td>20</td> <td>|</td> <td>21</td> <td>|</td> <td>22</td> <td>|</td> <td>23</td> <td>|</td> <td>24</td> <td>|</td> <td>25</td> <td>|</td> <td>26</td> <td>|</td> <td>27</td> <td>|</td> <td>28</td> <td>|</td> <td>29</td> <td>|</td> <td>30</td> <td>|</td> <td>31</td> <td>|</td> <td>32</td> <td>|</td> <td>33</td> <td>|</td> <td>34</td> <td>|</td> <td>35</td> <td>|</td> <td></td></tr></tbody></table>   <table border="0"><tbody><tr><td>Pin #</td> <td></td> <td>Lead Color</td> <td></td> <td>Input/Output</td> <td></td> <td>Component/Function</td> <td></td> <td></td> <td></td></tr> <tr><td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td></tr> <tr><td>1</td> <td></td> <td>Blue</td> <td></td> <td>Input</td> <td></td> <td>Engine speed signal</td> <td></td> <td>Voltage:</td> <td>6.5 - On starter motor cranking, &gt;8 - At idle speed</td></tr> <tr><td>2</td> <td></td> <td>Gray</td> <td></td> <td>--</td> <td></td> <td>Throttle position switch (Idling)</td> <td></td> <td>Voltage:</td> <td>0 - Idle speed, approx. 11 - Above idle speed</td></tr> <tr><td>3</td> <td></td> <td>Green/Red</td> <td></td> <td>--</td> <td></td> <td>Throttle position switch (Wide Open)</td> <td></td> <td>Voltage:</td> <td>0 - Wide open, approx. 11 - Before wide open</td></tr> <tr><td>4</td> <td></td> <td>Red</td> <td></td> <td>Input</td> <td></td> <td>Power supply +30</td> <td></td> <td>Voltage:</td> <td>Battery voltage</td></tr> <tr><td>5</td> <td></td> <td>Black</td> <td></td> <td>--</td> <td></td> <td>Signal Ground</td> <td></td> <td>Voltage:</td> <td>0.0 - Separate from power ground</td></tr> <tr><td>6</td> <td></td> <td>Blue/White</td> <td></td> <td>Input</td> <td></td> <td>Mass air flow, ground</td> <td></td> <td>Voltage:</td> <td>0.0 - Separate from power ground</td></tr> <tr><td>7</td> <td></td> <td>Orange</td> <td></td> <td>Input</td> <td></td> <td>Mass air flow, signal</td> <td></td> <td>Voltage:</td> <td>2.0 - Idling, 5.0 - Full Load</td></tr> <tr><td>8</td> <td></td> <td>Red/White</td> <td></td> <td>Output</td> <td></td> <td>Mass air flow, burn-off</td> <td></td> <td>Voltage:</td> <td>4.0 - At burn-off, 0 - In other cases</td></tr> <tr><td>9</td> <td></td> <td>Gray/White</td> <td></td> <td>Input</td> <td></td> <td>Power supply - main relay</td> <td></td> <td>Voltage:</td> <td>Battery Voltage</td></tr> <tr><td>10</td> <td></td> <td>n.c.</td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td> <td></td></tr> <tr><td>11</td> <td></td> <td>Green/Red</td> <td></td> <td>--</td> <td></td> <td>A/C Relay (LH 2.4.1) Time-delay relay, A/C (LH2.4)</td> <td></td> <td></td> <td></td></tr> <tr><td>12</td> <td></td> <td>Blue/White</td> <td></td> <td>I/O</td> <td></td> <td>Diagnostics lead K Data link connector, pin 1</td> <td></td> <td></td> <td></td></tr> <tr><td>13</td> <td></td> <td>Yellow</td> <td></td> <td>Input</td> <td></td> <td>Temperature sensor</td> <td></td> <td>Voltage:</td> <td>4 - 0.5 (-20) degrees C, (+80) degrees C</td></tr> <tr><td>14</td> <td></td> <td>Red/White</td> <td></td> <td>Input</td> <td></td> <td>A/C, ACC load signal</td> <td></td> <td>Voltage:</td> <td>12 - AUTO closed antifrost thermostat, 0 - ECON, OFF selected</td></tr> <tr><td>15</td> <td></td> <td>Green/Yellow</td> <td></td> <td>--</td> <td></td> <td>Jumper connection for cold start</td> <td></td> <td>Voltage:</td> <td>12 - Valve fitted, 0 - Valve not fitted</td></tr> <tr><td>16</td> <td></td> <td>Green/Red</td> <td></td> <td>I/O</td> <td></td> <td>Diagnostics lead L Data link connector, pin 2</td> <td></td> <td></td> <td></td></tr> <tr><td>17</td> <td></td> <td>Black/White</td> <td></td> <td>--</td> <td></td> <td>Chassis ground</td> <td></td> <td>Voltage:</td> <td>0 - Separate from signal ground</td></tr> <tr><td>18</td> <td></td> <td>Green/White</td> <td></td> <td>Output</td> <td></td> <td>Injectors, control signal</td> <td></td> <td>Voltage:</td> <td>7.1 Hz, 2.4 - 4.5 ms Frequency should increase with throttle opening.</td></tr> <tr><td>19</td> <td></td> <td>Yellow/White</td> <td></td> <td>Output</td> <td></td> <td>EGR valve (CA, M1990)</td> <td></td> <td>Voltage:</td> <td>Not activated Voltage, Less than battery voltage - Activated</td></tr> <tr><td>20</td> <td></td> <td>Violet</td> <td></td> <td>--</td> <td></td> <td>Fuel Pump operating circuit</td> <td></td> <td>Voltage:</td> <td>1 - Activated, Battery voltage - Ignition on</td></tr> <tr><td>21</td> <td></td> <td>Yellow/White</td> <td></td> <td>Output</td> <td></td> <td>Main relay operating circuit Output</td> <td></td> <td>Voltage:</td> <td>1 - Ignition on, Battery voltage - Ignition off</td></tr> <tr><td>22</td> <td></td> <td>Violet/White</td> <td></td> <td>Output</td> <td></td> <td>CHECK ENGINE light</td> <td></td> <td>Voltage:</td> <td>Battery voltage - Off, 1 - On</td></tr> <tr><td>23</td> <td></td> <td>Yellow/White</td> <td></td> <td>Input</td> <td></td> <td>EGR temp sensor (CA, M1990)</td> <td></td> <td>Voltage:</td> <td>4.5 - EGR closed, &lt;4.5 - EGR Open</td></tr> <tr><td>24</td> <td></td> <td>Green</td> <td></td> <td>Input</td> <td></td> <td>Oxygen sensor</td> <td></td> <td>Voltage:</td> <td>0.6 - 1.0 - Rich, 0.0 - 0.4 - Lean</td></tr> <tr><td>25</td> <td></td> <td>Blue/Red</td> <td></td> <td>Output</td> <td></td> <td>Load Signal Tq (EZK/DI)</td> <td></td> <td></td> <td>Frequency should increase with throttle opening</td></tr> <tr><td>26</td> <td></td> <td>White</td> <td></td> <td>Output</td> <td></td> <td>Shift-Up lamp (US Manual)</td> <td></td> <td>Voltage:</td> <td>Battery voltage - Not activated, 0 - Activated</td></tr> <tr><td>27</td> <td></td> <td>Yellow/Red</td> <td></td> <td>Output</td> <td></td> <td>EVAP canister purge valve</td> <td></td> <td>Voltage:</td> <td>Battery voltage - Open valve, 1 - Closed valve</td></tr> <tr><td>28</td> <td></td> <td>White</td> <td></td> <td>Input</td> <td></td> <td>PRE-IGNition, DI/APC</td> <td></td> <td>Voltage:</td> <td>0 - Enrichment Preignition, 6.5 - No enrichment, 12 - Enrichment knocking</td></tr> <tr><td>29</td> <td></td> <td>Gray/White</td> <td></td> <td>Input</td> <td></td> <td>Codification</td> <td></td> <td>Voltage:</td> <td>12 - Automatic transmission</td></tr> <tr><td>30</td> <td></td> <td>Orange</td> <td></td> <td>Input</td> <td></td> <td>Raising engine idle speed, auto</td> <td></td> <td>Voltage:</td> <td>Battery voltage - R, D, 1, 2, 3, 0 - P, N and manual</td></tr> <tr><td>31</td> <td></td> <td>Green/Red</td> <td></td> <td>Output</td> <td></td> <td>Consumption signal to EDU</td> <td></td> <td></td> <td>Frequency should increase with throttle opening</td></tr> <tr><td>32</td> <td></td> <td>Brown</td> <td></td> <td>Output</td> <td></td> <td>Cold-starting valve</td> <td></td> <td>Voltage:</td> <td>Battery voltage - Not activated, 0 - Activated (&lt; -15 degrees C)</td></tr> <tr><td>33</td> <td></td> <td>Blue/White</td> <td></td> <td>Output</td> <td></td> <td>IAC valve</td> <td></td> <td>Voltage:</td> <td>5-11 - Idling, no load</td></tr> <tr><td>34</td> <td></td> <td>Green</td> <td></td> <td>Input</td> <td></td> <td>Speed sensor</td> <td></td> <td>Voltage:</td> <td>6 - Rotating wheels, 0 or 12 - Stationary wheels</td></tr> <tr><td>35</td> <td></td> <td>Green/White</td> <td></td> <td>Input</td> <td></td> <td>Power supply +15</td> <td></td> <td>Voltage:</td> <td>Battery voltage - Ignition on</td></tr></tbody></table> n.c. = not connected
 
Je moet dus kijken bij nummer 34<table border="0"><tbody><tr><td>34</td> <td></td> <td>Green</td> <td></td> <td>Input</td> <td></td> <td>Speed sensor</td> <td></td> <td>Voltage:</td> <td>6 - Rotating wheels, 0 or 12 - Stationary wheels</td></tr></tbody></table>Volgens dit lijstje, moet dat een groene draad zijn, maar dit lijstje is niet altijd kleur-correct maar wel pin-correct.
Groeten,Gerben

Ga ik mee aan de slag! Ff kijken waar 'ie heen loopt om te beginnen, misschien wel helemaal niet richting tellerbak ofzo maar gewoon naar de achteras :S

Hallo collega 16 kleppers
Volgens mij was de tabel en dus de kleurcodes voor een Saab.  Pinout is uiteraard voor onze auto's hetzelfde, maar de kleurtjes niet.
Volgens mij loopt het snelheidssignaal van de achteras naar de tellerunit.  De tellerunit versterkt het signaal, poetst het meen ik ook nog iets op (misschien maakt het ook wel een mooi blokvormpje van de sinusbeweging) en stuurt het dan door naar ABS, ECU en CC (indien aanwezig).  Dus als de tellerunit het doet, ligt het probleem daar achter.
groetjes
Mathy

Bedankt! Bij de 740 is het kabeltje paars-wit (violet-wit in schema's geloof ik)..
Het lijkt er op dat ik eerder een spanningskabeltje verkeerd had aangesloten waardoor er continue spanning op de snelheidssensor stond. Na de poetsdag gisteren, vanochtend het glimmende beest van haar storing verholpen
 
groeten!