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22-05-2014, 04:35 PM | #1 | ||
When in doubt, GAS IT!!
Join Date: Sep 2006
Location: Lower Eyre Peninsula, SA
Posts: 3,018
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I just scanned the wagon and got error P1221 and now I'm a little worried but also a little confused. Forscan says it may be a faulty or damaged PCM or a short to power or ground in the VSS or a VSS open circuit. I checked the PCM to see if there was any moisture getting to it but it all looks A ok so I've ruled out external damage to the PCM. So I have a few questions....
1) Can there be a short or open circuit in the VSS if the speedo is still working correctly? 2) If so, what's the easiest way to get at the VSS module? From under the car or through the shifter hole from inside the car? 3) Is there any other obvious point in the wiring loom that would cause a short in the VSS circuit? 4) Is the VSS in any way linked to the engine operation directly that could affect fuel mileage as that's what prompted me to go looking for faults in the first place? Any help on any of the questions would be greatly appreciated. Cheers Bushbasher
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. HERS- BFIII Wagon Gold, alloys, dual fuel, bullbar, big tow pack, trans cooler, fully rebuilt HD suspension, Clarion, alarmed, full 2 1/2" sports system, mint body MINE- AUII Forte Meteorite, dual fuel but otherwise bog stock. MINE- AUII Fairlane Sportsman Liquid Silver over meteorite,HIDs', Airhog, Eagle Leads, dual fuel, custom rear springs, BA slotted discs + a second one for spares . |
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23-05-2014, 09:58 AM | #2 | ||
5.6L x 2 pilot
Join Date: Dec 2009
Location: Canbra
Posts: 15,038
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Hi Bushy
From the DTC section on here, here is a more detailed description - Click on DTC's on the menu bar above if it appears for you? It maybe a DM only feature? P1221 Traction control system malfunction where applicable DTC P1221 is reported if the there is a communication fault between the Traction Control Module (ASR) module and PCM Improper connection, short to Vehicle Power (VPWR) or ground in Vehicle Speed Sensor (VSS) connection between ASR module and PCM. VSS signal open circuit Faulty ASR module, refer to Group 2, Brakes. faulty PCM Cheers Stu
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2002 AU II LTD 5.6L 342ci T3 Short, AFR165 heads, Comp XE270HR-12 Cam, Brembo 4/4s(355/330), T3 5 spokes, LC-1 wideband, Whiteline HD swaybars, TCE 3K Hi Stall, PWR Auto Trans Cooler, Koni shocks, King Low Springs, Hurricane headers, 100 cpsi cats, Twin 2.5" exhaust. Quarter Mile: 13.73 @ 105.86mph Runner Up NA/DA to BF Fairlane/LTD Geelong AFD 2024 2002 XR8 pursuit 250 Custom twin 2.5" exhaust w Herrod modifed extractors, Tuned with Moates QH
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23-05-2014, 11:05 AM | #3 | ||
When in doubt, GAS IT!!
Join Date: Sep 2006
Location: Lower Eyre Peninsula, SA
Posts: 3,018
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Thanks Stu, but I got all that. The Forscan says exactly the same thing but it won't tell me the answers to the questions I posted mate.
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. HERS- BFIII Wagon Gold, alloys, dual fuel, bullbar, big tow pack, trans cooler, fully rebuilt HD suspension, Clarion, alarmed, full 2 1/2" sports system, mint body MINE- AUII Forte Meteorite, dual fuel but otherwise bog stock. MINE- AUII Fairlane Sportsman Liquid Silver over meteorite,HIDs', Airhog, Eagle Leads, dual fuel, custom rear springs, BA slotted discs + a second one for spares . |
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23-05-2014, 01:18 PM | #4 | ||
When in doubt, GAS IT!!
Join Date: Sep 2006
Location: Lower Eyre Peninsula, SA
Posts: 3,018
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Ok, I've worked it out. The other day the weld on the back of the resonator let go so I had it mig'd back up till I can organise a new centre muffler and in doing so we disconnected the battery. Well it seems when I re-connected the battery I didn't get a good enough connection even though it was good enough to start the car. Last night after musing on the problem for a while and deciding it made no sense that there could be a problem with the VSS if the speedo worked and as the car doesn't have traction control, it could only be a bad earth. So just in case it was a PCM issue I disconnected the battery and left it overnight then re-connected it today with a nice tight connection and tested it again and everything s' hunky dory and no errors popped up.
But that does mean the slowly degrading fuel economy, which started this whole hunt in the first place, must be down to the dodgy exhaust.
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. HERS- BFIII Wagon Gold, alloys, dual fuel, bullbar, big tow pack, trans cooler, fully rebuilt HD suspension, Clarion, alarmed, full 2 1/2" sports system, mint body MINE- AUII Forte Meteorite, dual fuel but otherwise bog stock. MINE- AUII Fairlane Sportsman Liquid Silver over meteorite,HIDs', Airhog, Eagle Leads, dual fuel, custom rear springs, BA slotted discs + a second one for spares . |
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23-05-2014, 02:40 PM | #5 | ||
With da Warlords
Join Date: May 2006
Location: Orange NSW
Posts: 1,781
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I've had this error code pop up ever since I bought my xr8, seven years ago. The speedo always worked and there were no earthing problems. So I always assumed it was just because my car was an OPT20, and therefore had the adjustable speedometer.
I've disconnected the VSS, tested it, cleaned connections, checked earth and always had the code. So it never really bothered me.
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You don't have to be faster than the bear, you just have to be faster than the slowest guy running from the bear. For Sale: Parachute. Only used once, never opened, small stain. Windsor Warlords AU III XR-8220 300+ rwhp of Manual fun XR50T Ute - 300rwkw (give or take depending on the day)
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