M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

ML always cold need ECU pinout/voltage

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Old 09-08-2014, 11:13 AM
  #26  
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ml320 yr 2000
yes, your pinout diagram showing where the pins are and the test 8.0-8.2 with wire color pretty much confirmed im on the right pin. my voltmeter was set at 12v I got 0.3v reading and my ohm meter set at 2k. for the ohm I had a 3.0 reading that pretty much totals my ohm to 6000ohm.


I was thinking it could be my recently replaced coolant sensor as defective but, since I am just getting a 0.3 volt reading at cold i don't see the need to go further. granting my engine is at 80-100c i should at least get 1v-0.9v. but i get 0.3v-0.4v


Should i still test ohm reading with hot engine?

Last edited by czarcaps; 09-08-2014 at 11:18 AM.
Old 09-11-2014, 07:04 AM
  #27  
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2002 ML 320 & 2006 ML500
Yes test it with Temp. gauge at 80°C and compare it to the chart.

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