browntown Posted January 3, 2007 Report Share Posted January 3, 2007 So for the first time I've ran codes on my problematic 850. Let me know if I'm intrepreting them correctly.only a2 code was 5-1-2 meaning too rich, could have told you that listening to it and looking at plugs, but good to see the computer knows as well. My guess is o2 sensor? or maybe related to codes below:a6 (ignition) codes: 4-1-1 (Throttle Position Sensor - why can't you plug tps in a search and get some good topics?) and 2-1-4 (Tach signal misses intermittently)I also pulled 3 a7 (instrument) codes, being 1-2-2 2-2-1 and 1-3-2 <-- I cant find a reference for these codes, anyone got a link? Or do I need to order the volvo pocket guide?Car runs OK, but really stumbles under acceleration, and have pretty much done most of the tuneup stuff (timing belt / water pump / rad hoses / tensioners / serpentine belt / plugs / cap / rotor / wires / vacuum hoses (not done yet) / filters (except fuel).Only major things left are PCV system and flame trap plus a good throttle body cleaning. Maybe have the injectors cleaned.Where should I start after PCV maitenance and finish vacuum lines? Should I just commit and buy a TPS right away, or should I try cleaning the maf and replacing those hoses first? Buy an o2 sensor? Link to comment Share on other sites More sharing options...
Guest 850T-5 Posted January 4, 2007 Report Share Posted January 4, 2007 A lot of O2 sensor codes get thrown or O2's are suspected when the problem lies in the fuel pressure regulator (usually a disconnected, cracked vacuum line or split rubber vacuum connector. This is a very common issue. Be sure to clean the PCV system, start with the fitting on the intake hose, make sure it's vacuum line is connected. I would replace all rubber vacuum lines and inspect the rubber connectors on the plastic hardened lines if you haven't already. They get brittle and get hairline cracks. Clean all connections under the hood, maybe even pull the AMM and spray the sensor eliment with some rubbing alcohol or electronics parts cleaner like CRC. Don't touch the eliment though, it's delicate. Probably don't need to pull the vacuum lines, just at a few OZ of Marvel Mystery Oil before your next fillup. Do about 3-4 treatments. Replace Spark Plugs if you haven't, use ONLY Volvo plugs, I've found they work best in whiteblocks. I've heard of aftermarket plugs causing problems. Replace wires with OE Bougi's if due, cap and rotor. Reset codes, disconnect negative battery terminal and press brake pedal to reset ECU. See what happens now and if there are an codes left zero in on those. It's possible to get more codes than are problems actually present just from need of good maintenance or fairly simple stuff as mentioned above. Link to comment Share on other sites More sharing options...
browntown Posted January 4, 2007 Author Report Share Posted January 4, 2007 Sounds like good advice, thanks for the help. I also suspect th fpr vacuum line. Wasn't in the mood to tear off the intake manifold today though. When you refer to the PCV system, do you mean to clean out the oil trap? Replace the flame trap? There is a lot of parts in the diagram on FCP including a couple hundred dollars to replace all that. I'll do it if I need to, but if I can just clean it all up, that's better. I'll get at it in the upcoming days and report back. Anything else I should be doing when I tear the intake manifold and fuel rail off? Rather not do it more than once. Link to comment Share on other sites More sharing options...
Guest 850T-5 Posted January 4, 2007 Report Share Posted January 4, 2007 Well, to get to the vacuum line to inspect it first, no need to pull the fuel rail. You should be able to see it if you look right underneath it, there will be a rubber elbow and a hardened plastic line that goes to the black vacuum line distributor thing bolted on the intake manifold. You can get your fingers in there, just pull the vacuum line off and pull the other end off the vacuum distribution thing behind the throttle spool. For the PCV, you can always just start by replacing the oil seperator piece on the intake hose. You can get these from any reasonable dealer for a decent price. You will need a different rubber vacuum line connector because the small vacuum line opening is a little larger on the new ones I found. Also recommend buying another clamp. Link to comment Share on other sites More sharing options...
AlvinL Posted January 4, 2007 Report Share Posted January 4, 2007 DTC information MFI 5–1–2: short term fuel trim (integrator), lower limit.ConditionThe short term fuel trim value is a measure of degree to which the injection period in the basic MFI module program must be varied to ensure that the engine is supplied with the optimum air/fuel mixture. This optimum mixture corresponds to a value of λ = 1. If the engine is running rich, the short term fuel trim will reduce the injection period to restore the optimum mixture. A DTC will be recorded if the engine runs so rich that the short term fuel trim reaches its lower limit and remains there for 166 seconds.Possible source-HO2S signal lead short–circuited to ground.-HO2S faulty.-Contact resistance and oxidation in MAF sensor connector.-MAF sensor faulty.Fault symptom-Fault may cause high fuel consumption and driving problems.1-2-2, Outside Temp. Sensor Circuit Open Or Shorted To Power2-2-1, Pass. Side Damper Motor Position Sensor Circuit Open Or Shorted To Power1-3-2, Driver’s Side Duct Temp. Sensor Circuit Open Or Shorted To PowerClear the codes and see if any returns. Re the PCV, suggest all hoses and oil separator be replaced. Clean the flame trap housing well. Remove and clean the throttle body. Reinstall with a new gasket. My 0.02. Link to comment Share on other sites More sharing options...
browntown Posted January 4, 2007 Author Report Share Posted January 4, 2007 1-2-2, Outside Temp. Sensor Circuit Open Or Shorted To Power2-2-1, Pass. Side Damper Motor Position Sensor Circuit Open Or Shorted To Power1-3-2, Driver’s Side Duct Temp. Sensor Circuit Open Or Shorted To PowerClear the codes and see if any returns. Re the PCV, suggest all hoses and oil separator be replaced. Clean the flame trap housing well. Remove and clean the throttle body. Reinstall with a new gasket. My 0.02.cool thanks for the a7 codes, I couldn't find em anywhere, going to order that pocket manual and scan the fault pages. Link to comment Share on other sites More sharing options...
Ozark Lee Posted January 4, 2007 Report Share Posted January 4, 2007 Download the manual.http://www.matthewsvolvosite.com/chat/phpB...opic.php?t=8018Given the codes you are pulling you have the automatic (ECC) climate control. It is very thorough on repair and replacement procedures....Lee Link to comment Share on other sites More sharing options...
browntown Posted January 4, 2007 Author Report Share Posted January 4, 2007 1-2-2, Outside Temp. Sensor Circuit Open Or Shorted To Power2-2-1, Pass. Side Damper Motor Position Sensor Circuit Open Or Shorted To Power1-3-2, Driver’s Side Duct Temp. Sensor Circuit Open Or Shorted To Powerwait a minute just realised something, aren't those b1 climate control codes? I got those codes out of A7. Are A7 and B1 codes the same? Link to comment Share on other sites More sharing options...
AlvinL Posted January 4, 2007 Report Share Posted January 4, 2007 wait a minute just realised something, aren't those b1 climate control codes? I got those codes out of A7. Are A7 and B1 codes the same?Sorry, my mistakeA7: 1-2-2, Temperature sensor/Interval too long.Is the temperature gauge misbehaving in any way? Does it read around 2.45 to 3.00 when warmed up. How long does it take to get there?A7: 1-3-2, Engine speed sensor signal incorrect/absent.1) This DTC will set if engine speed signal is absent for at least 10 seconds when generator sends charge signal (D+). Tachometerwill not function.2) To correct this problem, check for open, shorted to voltage or grounded signal leads. Also check for connector contact resistance or a fault in ignition/fuel system.A7: 2-2-1, Speed signal/signal absent1) This DTC will set if instrument cluster does not register a speed signal (input signal) when engine speed signal exceeds 1500 RPM for at least one minute and engine temperature exceeds 122F (50C).2) Speedometer may read too low or give no output. DTC is set in engine control system. On vehicles equipped with Electronic Climate Control (ECC), fan speed does not reduce with increased road speed. On vehicles equipped with trip computer, faults occur in displays foraverage speed, average consumption, instantaneous consumption and trip computer trip recorder. Cruise control will shut down and a DTC will set. If ABS light comes on, see appropriate BRAKES - ANTI-LOCK article.3) To correct this problem, check for broken signal lead, high contact resistance, idle above 1500 RPM, or ABS system. See appropriate BRAKES - ANTI-LOCK article.This information is in the manual mentioned by Ozark. Link to comment Share on other sites More sharing options...
browntown Posted January 4, 2007 Author Report Share Posted January 4, 2007 Thank you, they all seem to reference similar things, hopefully I can find one problem that will fix em all. This information is in the manual mentioned by Ozark.Maybe I've been clicking on the wrong subsections, but the section "tests with codes" in the above referenced manual only has a2 and a6 codes. Is there another subsection with all the other codes that I am missing? Link to comment Share on other sites More sharing options...
AlvinL Posted January 4, 2007 Report Share Posted January 4, 2007 Thank you, they all seem to reference similar things, hopefully I can find one problem that will fix em all. Maybe I've been clicking on the wrong subsections, but the section "tests with codes" in the above referenced manual only has a2 and a6 codes. Is there another subsection with all the other codes that I am missing?Instrument panel. Link to comment Share on other sites More sharing options...
browntown Posted January 4, 2007 Author Report Share Posted January 4, 2007 Instrument panel.Thank you.Do i win the retard noobie of the month award? You can put it next to my arcade scores. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.