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#1
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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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#2
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With WOT does the reading change?
__________________
2016 Monsoon Gray Audi Allroad - 21k 2008 Black Mercedes E350 4Matic Sport - 131k 2014 Jeep Wranger Unlimited Sahara - 62k 2003 Gray Mercedes ML350 - 122k |
#3
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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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#4
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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.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#5
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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
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just to be clear what pins do you use to measure duty cycle, 2+3 or 1+3?
__________________
1986 300SDL, 211K,Dealership serviced its whole life 1991 190E 2.6(120k) 1983 300D(300k) 1977 300D(211k) |
#7
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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
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pin #s
Its #2 and #3. pins for duty cycle .
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#9
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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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