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  #1  
Old 10-12-2009, 06:04 PM
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1988 300E Duty Cycle Reading

I have a reading of 30.6 with ignition on engine off. Was looking for 70%. 1988 300E. Do I have a bad controller? Engine will crank with the idle control valve disconnected, but will die if rpm goes below 1500. What next.

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Old 10-12-2009, 10:06 PM
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With WOT does the reading change?
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  #3  
Old 10-13-2009, 11:40 AM
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1988 300E Duty Cycle Reading

Yes it reads 80.7 with engine off wot. I think I might have found the problem in the coolant temp sensor. I disconnected sensor and I have the 70% Federal I was looking for. Also the engine starts much easier with sensor off, but will not idle. Thanks
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Old 10-13-2009, 11:47 AM
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Replace the temp sensor, plug back in, and try starting. I bet it will work. If not, check the idle control valve for proper operation.
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  #5  
Old 10-13-2009, 11:56 AM
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1988 300E Duty Cycle Reading

the idle control valve clicks a couple seconds after ignition on. thanks for the help.
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  #6  
Old 10-16-2009, 03:04 PM
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just to be clear what pins do you use to measure duty cycle, 2+3 or 1+3?
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  #7  
Old 10-16-2009, 06:53 PM
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This is a trouble code. If I can find my FSM CD, I'll try to look it up for you.
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  #8  
Old 10-17-2009, 12:11 AM
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pin #s

Its #2 and #3. pins for duty cycle .



Quote:
Originally Posted by Oracle12345 View Post
just to be clear what pins do you use to measure duty cycle, 2+3 or 1+3?
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  #9  
Old 10-18-2009, 10:49 AM
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1988 Duty Cycle Reading.

Hello Oracle12345 and mac, I used pin# 3 and 2. Also I replaced temp sensor with no changes in duty cycle. Found I only needed to remove the one sensor connector that goes to the KE control unit on the two pin coolant temp sensor to get 70.6% duty cycle. Wires from temp sensor check ok to control unit (N3) and ezl unit 4 pin sensor connector. Will start easily if temp sensor unhooked and idle control valve removed from hoses. But must run at least 2000rpm or engine labors and stalls. Thanks.

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