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1994 Mercedes Benz C220 has no Pulse on injector#2

Tiny
SPENCERWITTU
  • MEMBER
  • 1994 MERCEDES BENZ C220
  • 209,000 MILES
1994 mercedes benz c220 has no pulse on injector#2 it has 12v no neg pulse.I have replaced ecm
Monday, October 15th, 2012 AT 7:26 PM

10 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Did you check the wiring to ECM for continuity? The wire could have a break in between.
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Monday, October 15th, 2012 AT 8:02 PM
Tiny
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THANKS FOR RESPONSE, YES IT HAS CONTINUITY NEG TO ECM AND POS HAS 12V
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Monday, October 15th, 2012 AT 8:16 PM
Tiny
KHLOW2008
  • MECHANIC
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Such symptoms can only indicate a bad ECM.

Did you check for trouble codes?
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Monday, October 15th, 2012 AT 8:36 PM
Tiny
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I put a used ecm in and have the exact problem inj#2 only no pulse so was this ecm bad or did something burn this one up instantly. Meaning after install of ecm car never ran right not even for a second?
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Tuesday, October 16th, 2012 AT 12:03 AM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
If you have a short in the circuit, it can short out the ECM.

Did you test if the injector is working?
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Tuesday, October 16th, 2012 AT 7:58 AM
Tiny
SPENCERWITTU
  • MEMBER
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Yes, injector is clicking just fine also I ran a new neg wire from ecm to injector bypassing any possible short. When you put a testlight on positive batt then touch to neg inj wire to ecm light does light up dim like not 12v but grounding out. Only #2 inj wire. With noid light it will not blink or stay on no light at all?
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Tuesday, October 16th, 2012 AT 6:52 PM
Tiny
KHLOW2008
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You should not be doing that. You can damage the ECM. But then again the ECM seems to be faulty if it is not pulsing.
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Tuesday, October 16th, 2012 AT 6:57 PM
Tiny
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Yes, can the inj. Driver go to full ground like stuck. Iits odd that two ecm's would do the same thing?
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Tuesday, October 16th, 2012 AT 7:03 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Usually when there is a design flaw, the same problem can occur for components of the same batch after a certain period of usage so not really surprising.
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Tuesday, October 16th, 2012 AT 7:10 PM
Tiny
SPENCERWITTU
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Yes I could see that. Now with the test light isn't that the same principal as plugging in a noid light. And I do really appriciate your help.
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Tuesday, October 16th, 2012 AT 7:25 PM

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