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#1
07-21-2007, 04:30 PM
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P0170, P0173 Help?
I have had some trouble with CEL for a few months. It flashed over a year ago, P0170 and P0173 came up, and local dealer tech told me I needed both rear O2 sensors. I lost confidence, cleaned the MAF, and had no problems for some time. In the past two months, CEL is back on, cleaned MAF again, but problem returned. I noted freeze data from my code reader and it seems that I may now need a new MAF. I hope the data below will confirm my guess, or another solution can be suggested. I have a few questions (most of the “newby” type) for the oracles, if they will indulge me:
What is the difference between FT 1, 2, 3, 4? Related to O2 sensors? What is KPA units for data reported for MAP/ MAF? How can I “reset” the ECU to begin the relearn process? The STFT 1 and 2 seem within reasonable range and LTFT are at/outside the limits – does this indicate a recent change in conditions (MAF out of range)? I already checked for vacuum leeks using the old starter fluid method – no leaks The P0130, P0150 seem to be related to the MAF errors, based on other threads, any comments? Thanks for any input – I’m at my limit of experience and knowledge Freeze data from Actron CP9175 Date 7/15 7/17 7/19 7/20 7/21 Codes 170,173 170,173 170,173 170,173 170,173 130, 150 RPM 1875 600 575 575 550 Load 40.7% 22.7 23.1 23.1 23.1 MAP(KPA) 74 43 43 45 44 Coolant Temp 181 186 186 183 186 STFT 1 2.3% -1.0 -3.4 0.0 0.8 LTFT 1 28.9% 30.4 31.4 29.6 33.5 STFT 2 1.5% 0.8 -3.4 0.7 -1.0 LTFT 2 29.6% 31.2 32.0 30.4 34.3 STFT 3 -100.6 -100.6 -100.6 -100.6 -100.6 LTFT 3 -100.6 -100.6 -100.6 -100.6 -100.6 STFT 4 -100.6 -100.6 -100.6 -100.6 -100.6 LTFT 4 -100.6 -100.6 -100.6 -100.6 -100.6 MPH 43 0 0 0 0 Fuel Sys 1 Closed Closed Closed Closed Closed Fuel Sys 1 Closed Closed Closed Closed Closed 
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