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#1
07-27-2008, 11:51 AM
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P0170 P0173 Error codes Definitive test on AMM
2000 C280 with 63m. I have been getting an intermittent CEL that is now on all the time. Error code is P0170 and P0173. Is no power at 4000RPM and WOT a definitive indication that the AMM is kaput? Power seems fine at 4000 rpm and hard acceleration. Tried a spritz of CRC sensor cleaner but light comes back on within 20 miles. Just had a previous code P0150 and changed left front o2 sensor. Just changed plugs and wires to cure a rough idle. And I am due for a fuel filter change.
glenmore 2000 C280 1991 300CE 1990 LS400 
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#2
07-27-2008, 01:26 PM
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The definitive test would evaluate fuel trims data or viewing calc load on OBDII during the event.
But since I buy them by the bushel I'd just throw one at it and view the results to save a step.
__________________
Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#3
07-27-2008, 06:46 PM
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Steve, are you saying to look at the calc load "snapshot" data stored when the code happened? What do you look for?
__________________
1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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#4
07-27-2008, 07:03 PM
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No, I'm saying to look at the calculated load pid when the engine falls on its face at 4000+rpm full throttle.
Calculated load should be over 80% in such conditions. Calc load is calculated from AMM output. If the output calculates to 40-60% then it obviously is under reporting such a condition.
__________________
Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#5
07-27-2008, 09:07 PM
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http://www.picoauto.com/automotive-oscilloscope-guide/lambda-sensors.html
One of my favorite videos... guy is articulate , too.
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A Dalton Last edited by Arthur Dalton; 07-27-2008 at 09:25 PM.
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#6
07-27-2008, 09:10 PM
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change your MAF
__________________
2005 SL65 1999 E300 1995 E300 1994 SL320 1988 560SL 1987 300TD 1982 300D 1955 300SL
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#7
08-01-2008, 09:15 AM
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So far so good. Replaced the AMM insert and no CEL so far. After cleaning and clearing the codes last time, the CEL came back on after a day or so.
Thanks all, glenmore 2000 C280 1991 300CE 1990 LS400
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