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Discussion Starter #1
See alot of people take Check Engine Lights (CEL) for granted when they should have some concern as diagnostics has come a long way giving owners a bit more accuracy as far as finding and repairing problems is concerned. As you all may know (and those who dont) that back in 1996 the Automotive Industry was mandated to uniformly standardize and update in respect to emissions system computers, the infomation they monitored and recorded for retrieval later by a certified technician. What that meant to them was that they had to change the way they retrieved, stored and the means by which codes were used in regards to the emissions system and its computer. The mandate standardized the system to be used right down to the port from which the information can be uploaded from the emissions computer and was given the dubious name of OBD (OnBoard Diagnostics, I (pre 96) or II (post 96) both are different in many respects). The codes themselves were also mandated so that basically you could have an import or a domestic and still be able to troubleshoot the issue regardless of make or type of vehicle. OBD ports can be found either under the dash or behind the ashtray (depending on make and model) which makes data retrieval very simple and timely.


Intro:

The main difference in the two types of OBD systems are software related basically because the OBD I system only read if the emissions system was operating or not. The only major shortcoming of this type of diagnostic is the fact that emissions system start to deteriorate slowly. The beauty of the OBD II (the 2nd generation of OBD) is that it is accurate enough to find shortcomings by monitoring more sources of info (sensors and systems), detect errors and save info pertaining to what was happening when the error occured.

Monitoring:

Combined there are two major catergories of monitors used by the OBD II system. Consisting of 11 monitors these two catergories (single and continuos) perform their duty either once every driving cycle (Single) or continously to ensure the computer knows whats happening, when and if it is completed succesfully. The continuos monitors are compromised by the CCM (Comprehensive Component Monitor), Fuel System Monitor and Misfire Monitor while the single monitors are composed of EVAP monitor, AC monitor, Secondary Air System monitor, EGR monitor, Catalyst monitor, Heated Catalyst heater monitor, Oxygen sensor and Oxygen sensor heater monitor.

OBD II Trouble Code decoding:

Basically OBD II system as opposed to OBD I can set aside codes and save them in two catergories which also determines the actions the computer takes to deal with the error. The first type will set off the CEL instantly if an error is detected that is in memory as one that requires the action of the computer to trigger the CEL. For those who are unfortunate to see a flashing CEL there is a serious issue that is occuring that can potentially damage the engine thus requiring immediate/correct action(s) by the opreator. At the sametime the computer is flashing the CEL it will save the appropriate codes involved with the error along with saving the parameters of the engine's operating system as the error is occuring for later retrieval/correction. By parameters i mean that it will save info regarding the fuel system status, fuel ratio :roll: , MAP vacuum :roll: , water temperature, engine load and engine speed. The second type of codes will trigger a different chain of reactions from the OBD computer. At this point the OBD I system wouldnt know what to do but the 2nd generation will detect this type of error and instead of triggering the CEL it will store and monitor this condition waiting for a re-occurance so that the CEL is triggered and again the engine's operating system parameters are saved but if the error doesnt happen again the codes are erased. If the CEL comes on it will stay on until the errors are no longer occuring after three back to back driving cycles. If that happens the CEL goes off and the appropriate codes stored in the computer for 40 cycles to help technicians track and correct the issue. simple as that.

Reading Codes:

When a technician plugs in an OBD II scanner to your car via your OBD port they are given a five digit code (one letter and four numbers) which indicates the system and the type of error the computer has detected in the past or is occuring currently. The letter identifies the system, the first digit identifies a "generic or manufacturer specific" space think dummy letter, the second digit identifies the sub system involved and the final two digits zero in on the eaxct area that failed. Please remember that although there are many tools out there that can read codes only dealership issue scan tools (aka not cheap and very advanced) can read and display parameter snap shots from the OBD computer.



All in all keep in mind that as you "turn up the boost" that your engine computer is there to keep tabs on you and help you by storing and alerting you to detrimental conditions (READ...DETONATION!). So if you happen to get a CEL dont just ignore it get to the bottom of it cause your engine depends on it. Happy boostin!
 

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acr2nv said:
All in all keep in mind that as you "turn up the boost" that your engine computer is there to keep tabs on you and help you by storing and alerting you to detrimental conditions (READ...DETONATION!). So if you happen to get a CEL dont just ignore it get to the bottom of it cause your engine depends on it. Happy boostin!
Nice write-up, I even learned a few things :p

Are ther any OBDII dataloggers currently generic or specific to mopar which are recommended? This is a must in a modified turbocharged vehicle in my book...just like having a good boost guage :)
 

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Discussion Starter #3
there are a few that can read the codes but like i said the dealer issued units will present more of the data that is available. The generic units can give you the codes but what good does it do you when the dealer issue units can show you a wealth more info that can help you get a grasp on things. I will not take total credit for the info its thanks to something i read recently and felt the need to pass along.
 

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I understand that the dealer's equipment can do& show more but there is still alot of info that can be gained from OBDII liggers especially when moddifying & racing. Here's an examples which got it's start in the DSM world but because OBDII is universal on most '96 or later vehicles they could be used here as well.

This is a quality unit from pocketlogger.
http://pocketlogger.com/
screen shots
http://pocketlogger.com/?page=screendsm
 

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I think it is at least an automatic $100 for any
shop to plug-in and pull any codes. So getting
an OBD-II reader between you and some buds
will pay off pretty quickly down the road.
 

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A few place to get a OBD-2 scanner...
http://www.obd-2.com/

Or pick one up at AutoZone for less then $90.00!

Codes:

P0031 Front oxygen (A/F) sensor heater circuit low input
P0032 Front oxygen (A/F) sensor heater circult high input
P0037 Rear oxygen sensor heater circuit malfunction
P0038 Rear oxygen sensor heater circuit high input
P0065 Air assist injector solenoid valve malfunction
P0066 Air assist injector solenoid valve circuit low input
P0067 Air assist injector solenoid valve circuit high input
P0101 Mass air flow sensor circuit range/performance problem (high input)
P0102 Mass air flow sensor circuit low input
P0103 Mass air flow sensor circuit high input
P0106 Pressure sensor circuit range/performance problem (low input)
P0107 Pressure sensor circuit low input
P0108 Pressure sensor circuit high input
P0111 Intake air temperature sensor circuit range/performance problem
P0112 Intake air temperature sensor circuit low input
P0113 Intake air temperature sensor circuit high input
P0117 Engine coolant temperature sensor circuit low input
P0118 Engine coolant temperature sensor circuit high input
P0121 Throttle position sensor circuit range/performance problem (high input)
P0122 Throttle position sensor circuit low input
P0123 Throttle position sensor circuit high input
P0125 Insufficient coolant temperature for closed loop fuel control
P0128 Thermostat malfunction
P0130 Front oxygen (A/F) sensor circuit range/performance problem (lean)
P0131 Front oxygen (A/F) sensor circuit range/performance problem (low input)
P0132 Front oxygen (A/F) sensor circuit range/performance problem (high input)
P0133 Front oxygen (A/F) sensor circuit slow response
P0136 Rear oxygen sensor circuit malfunction
P0139 Rear oxygen sensor circuit slow response
P0171 Fuel trim malfunction (A/F too lean)
P0172 Fuel trim malfunction (A/F too rich)
P0181 Fuel temperature sensor A circuit range/performance problem
P0182 Fuel temperature sensor A circuit low input
P0183 Fuel temperature sensor A circuit high input
P0244 Wastegate control solenoid valve malfunction (high input)
P0245 Wastegate control solenoid valve circuit low input
P0246 Wastegate control solenoid valve circuit high input
P0301 Cylinder 1 misfire detected
P0302 Cylinder 2 misfire detected
P0303 Cylinder 3 misfire detected
P0304 Cylinder 4 misfire detected
P0327 Knock sensor circuit low input
P0328 Knock sensor circuit high input
P0335 Crankshaft position sensor circuit malfunction
P0336 Crankshaft position sensor circuit range/performance problem
P0340 Camshaft position sensor circuit malfunction
P0341 Camshaft position sensor circuit range/performance problem
P0420 Catalyst system efficiency below threshold
P0442 Evaporative emission control system malfunction
P0444 Evaporative emission control system purge control valve circuit low input
P0445 Evaporative emission control system purge control valve circuit high input
P0447 Evaporative emission control system vent control low input
P0448 Evaporative emission control system vent control high input
P0451 Evaporative emission control system pressure sensor range/performance problem
P0452 Evaporative emission control system pressure sensor low input
P0453 Evaporative emission control system pressure sensor high input
P0456 Evaporative emission control system malfunction
P0457 Evaporative emission control system leak detected (fuel filler cap loose/off)
P0461 Fuel level sensor circuit range/performance problem
P0462 Fuel level sensor circuit low input
P0463 Fuel level sensor circuit high input
P0464 Fuel level sensor intermittent input
P0480 Cooling fan relay 1 circuit low input
P0483 Cooling fan function problem
P0500 Vehicle speed sensor malfunction
P0506 Idle control system RPM lower than expected
P0507 Idle control system RPM higher than expected
P0508 Idle control system circuit low input
P0509 Idle control system circuit high input
P0512 Starter switch circuit high input
P0545 Exhaust gas temperature sensor circuit low input
P0546 Exhaust gas temperature sensor circult high input
P0604 Internal control module memory check sum error
P0703 Brake switch input malfunction
P0705 Transmission range sensor circuit malfunction
P0710 Transmission fluid temperature sensor circuit malfunction
P0715 Torque converter turbine speed sensor circuit malfunction
P0720 Output speed sensor (vehicle speed sensor 2) circuit malfunction
P0725 Engine speed input circuit malfunction
P0731 Gear 1 incorrect ratio
P0732 Gear 2 incorrect ratio
P0733 Gear 3 incorrect ratio
P0734 Gear 4 incorrect ratio
P0741 Torque converter clutch system malfunction
P0743 Torque converter clutch system (Lock-up duty solenoid) electrical
P0748 Pressure control solenoid (Line pressure duty solenoid) electrical
P0753 Shift solenoid A (Shift solenoid 1) electrical
P0758 Shift solenoid B (Shift solenoid 2) electrical
P0778 2-4 brake pressure control solenoid valve (2-4 brake duty solenoid) circuit malfunction
P0785 2-4 brake timing control solenoid valve (2-4 brake timing solenoid) circuit malfunction
P1086 Tumble generator valve #2 (LH) position sensor circuit low input
P1087 Tumble generator valve #2 (LH) position sensor circuit high input
P1088 Tumble generator valve #1 (RH) position sensor circuit low input
P1089 Tumble generator valve #1 (RH) position sensor circuit high input
P1090 Tumble generator valve #1 (RH) malfunction (stuck open)
P1091 Tumble generator valve #1 (RH) malfunction (stuck close)
P1092 Tumble generator valve #2 (LH) malfunction (stuck open)
P1093 Tumble generator valve #2 (LH) malfunction (stuck close)
P1094 Tumble generator valve circuit #1 (opencircuit)
P1095 Tumble generator valve circuit #1 (overcurrent)
P1096 Tumble generator valve circuit #2 (opencircuit)
P1097 Tumble generator valve circuit #2 (overcurrent)
P1110 Atmospheric pressure sensor low input
P1111 Atmospheric pressure sensor high input
P1112 Atmospheric pressure sensor range/performance problem
P1130 Front oxygen sensor circuit malfunction (open circuit)
P1131 Front oxygen sensor circuit malfunction (short circuit)
P1134 Front oxygen (A/F) sensor microcomputer problem
P1137 Front oxygen (A/F) sensor circuit range/performance problem
P1139 Front oxygen (A/F) sensor #1 heater circuit perfomance/range problem
P1141 Mass air flow sensor circuit range/perfomance problem (low input)
P1142 Throttle position sensor circuit range/performance problem (low input)
P1146 Pressure sensor circuit range/performance problem (high input)
P1230 Fuel pump control unit malfunction
P1244 Wastegate control solenoid valve malfunction (low input)
P1245 Wastegate control solenoid valve malfunction (fail-safe)
P1301 Fire due to increased exhaust temperature
P1312 Exhaust temperature sensor malfunction
P1400 Fuel tank pressure control solenoid valve circuit low input
P1420 Fuel tank pressure control solenoid valve circuit high input
P1443 Evaporative emission control system vent control function problem
P1480 Cooling fan relay 1 circuit high input
P1507 Idle control system malfunction (fail-safe)
P1510 Idle air control solenoid valve signal 1 circuit low input
P1511 Idle air control solenoid valve signal 1 circuit high input
P1512 Idle air control solenoid valve signal 2 circuit low input
P1513 Idle air control solenoid valve signal 2 circuit high input
P1514 Idle air control solenoid valve signal 3 circuit low input
P1515 Idle air control solenoid valve signal 3 circuit high input
P1516 Idle air control solenoid valve signal 4 circuit low input
P1517 Idle air control solenoid valve signal 4 circuit high input
P1518 Starter switch circuit low input
P1540 Vehicle speed sensor malfunction 2
P1544 High exhaust temperature detected
P1560 Back-up voltage circuit malfunction
P1590 Neutral position switch circuit high input
P1591 Neutral position switch circuit low input
P1592 Neutral position switch circuit (MT model)
P1594 Automatic transmission diagnosis input signal circuit malfunction
P1595 Automatic transmission diagnosis input signal circuit low input
P1596 Automatic transmission diagnosis input signal circuit high input
P1698 Engine torque control cut signal circuit low input
P1699 Engine torque control cut signal circuit high input
P1700 Throttle position sensor circuit malfunction for automatic transmission
P1701 Cruise control set signal circuit malfunction for automatic transmission
P1703 Low clutch timing control solenoid valve circuit malfunction
P1711 Engine torque control signal 1 circuit malfunction
P1712 Engine torque control signal 2 circuit malfunction
 

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around here autozone, etc... will pull codes for free.
 

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NeonDan said:
I will not take total credit for the info its thanks to something i read recently and felt the need to pass along.


I knew that read like De' ja Vu.


ASE?





NachO_SRT
 

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Just a heads up before you go out and spend money on a OBD-II scanner/logger, Stage 1&2 is NOT OBDII, Hell, I don't even think it is OBDI... I hooked up my OBDII logger/Scanner from Scantools.net and it read it as a OBDI protocol BUT it is NOT OBDI eaither. It is some kind of hybrid. This is why the second O2 sensor does not need to be in the pipe. You still have to keep it physically connected to the connector but it does not have to be in the stream. I have my second O2 sensor zip-strapped to the cross member and my wideband in the stream and do not get any codes. Stage 1 and 2 are not OBDII though so before you go out and waste your money, be aware.. If you are stock, it works good....
 

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Discussion Starter #11
cars are require a DRBII scan tool from DCX
 

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5th time check engine light On in 6 days......!!!!

Since I installed a Mopar BOV a week ago, I got 5 cyl misfire codes 4 #P0304 and 1 P0303.....took it to the dealer all 5 times and guess back there with this latest one tomorrow.......... there was a software update for my 004 SRT4 which the mechenic uploaded figuring that might take care of it, but it tripped back on again, I keep thinkin it might be a defective oxy sensor or a loose exhaust clamp since they did a TSB on exhaust tips alignment on it a couple of weeks back,I know the BOV is installed ok..I had it off a couple of times already to see if it was trippin it off,bov gasket is fine, no leaks anywhere at all, bolts ( 3 ) nice and tight so no leaks there, hoses where they are supposed to be.... it seems to trip on when I just start up and during idling... there was an issue with a TBS regarding cyl#3 and #4 plugs and wires and they changed both with new parts.
I can use all the help I can get to solve this sh*t anyone had this problem happen to them, please help.Thanks everyone.
my email is: [email protected]
Again thank you :crying:
 

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iv'e found just about all of the code readers will pull and clear codes, but most of them won't read live data on staged pcm's, i have autoxray obd1 -2 and it won't read live data on my s1, always comes up with can not connect with vehicle. it will pull and clear codes though.
 

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When you pull the battery ground or remove fuse #21, to clear the codes, can the dealer still go in and read past codes? If so, for how long, and is there a way to make sure they're completely deleted ?
 

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Dayn said:
When you pull the battery ground or remove fuse #21, to clear the codes, can the dealer still go in and read past codes? If so, for how long, and is there a way to make sure they're completely deleted ?
If you do it for long enough they should not be able to see any codes. They probably will be able to see that it has been reset recently however, many do something like tell them how many starts since it was reset. Hopefully someone with more specific SRT info will come along with a more precise answer.
 
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