[R129 SL] (no subject)

[Jan Kuylaars]

All values measured to ground unless otherwise noted 	
Conn./Plug/Pin	 Pin Information	 Test Value	 Comments	
 <javascript:zoomPart('N30')> N30	  	  	  	
1.6	 Rear axle VSS output, generated by L6, processed in ECM and
sent to other ECMs	 Ignition on, lift rear of vehicle.Turn any rear
wheel > 1 rev/sec by hand > 3 VAC or with vehicle moving	 20 mph
/ 200 Hz35 mph / 330 Hzsquare wave	
1.91.30	 Rear axle VSS sensor, + input.Rear axle VSS sensor, - input.
ECM disconnected0.6-3.2 kOhms across pins 1.9 and 1.30Sine wave.
Frequency varies with wheel speed.	 Note 1	
 <javascript:zoomPart('N4/3')> N4/3	  	  	  	
1.9	 Rear axle VSS signal input, controls CC/ISC system function
depending on vehicle speed	 same as N30 1.6	 Feed from
tractionsystem via Z90/1	
 <javascript:zoomPart('N3/4')> N3/4	  	  	  	
1.8	 Rear axle VSS input from ABS system	 same as N30 1.6
Feed from tractionsystem via Z90/1	
Note 1	 To test, spin wheel at 1 rev/sec, measure at least 120 mVAC
between both wires of sensor. If voltage is OK, measure the sensor's
resistance while pulling, twisting and bending the sensor wires, looking
for intermittent opens. Finally, check the sensor tip and rotor teeth
for dirt or breakage. An oscilloscope can also be used to check the
waveform - chipped or dirty teeth show up as missing or malformed waves.

 
Met vriendelijke groeten,
Jan Kuylaars
Technical Manager Rian bv.
 

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