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JimboD3
Member Since: 23 Mar 2009
Location: Hertfordshire
Posts: 348
  
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Used my nice new BAS remap tool to check for DTC codes today, got a P0578 and P1934 logged........
a) What does DTC mean ?, and
b) What do the two logged codes mean - I googled both, think P0578 is cruise control related ?, but P1934 not listed anywhere.
Thanks,
Jim Jim
Standard TDV6 HSE
Non-standard Td5 110 Hardtop
Club Traxide
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 15th Dec 2009 6:50 pm |
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JF Lux
Member Since: 08 Sep 2007
Location: A little country in Europe
Posts: 3522
 
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p0578 = Cruise Control Multi-Function Input A Circuit Stuck
p1934 = vehicle speed signal
Now the real trick is working out what they really mean...and what needs to be done about them. The next American ex-pat that calls it a "truck" is going to find out what 2.7 tons feels like on their foot...
Club "yes, I too have had the EGR's replaced..."
Club "yes, I too have had the compressor replaced..."
Club "yes, I too once had the car at the dealer for a couple of weeks nearly 4 weeks over 4 weeks...5 weeks"
Club "yes, I too have had EPB failure..."
Club "yes, I too get mysterious bings and bongs..."
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| 15th Dec 2009 7:40 pm |
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JimboD3
Member Since: 23 Mar 2009
Location: Hertfordshire
Posts: 348
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Hmmm, I'd only got the ignition on, engine was not running - does this explain the p1934 'vehicle speed signal' code ?
I cleared the codes, then did the remap........and promptly forgot to check if the codes came back 
I'll have a look-see tomorrow and see if the codes have returned. Jim
Standard TDV6 HSE
Non-standard Td5 110 Hardtop
Club Traxide
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| 15th Dec 2009 9:45 pm |
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viethson
Member Since: 13 Jan 2009
Location: Bavaria
Posts: 136
  
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P0578 possible cause:
* speed control multi function input A circuit high resistance
* speed control multi function input A circuit short circuit to ground
* speed control multi function input A circuit short circuit to power
* speed control switch stuck
action: Refer to the electrical guides and check the cruise control circuit between the ECM and switch.
Check the switch operation and renew as necessary.
P1943 possible cause:
* Vehicle speed invalid signal received over CAN
action: Check for ABS and TCM DTCs and rectify as necessary. Refer to the relevant workshop section.
Refer to the Network Communication section in the workshop manual.
Hope that helps a little.
Cheers,
Marc Life in the slow lane
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| 15th Dec 2009 9:53 pm |
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Tawny Owl
Member Since: 22 Oct 2008
Location: Here and there
Posts: 1645
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Jim
DTC Means Diagnostic Trouble Codes 
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| 15th Dec 2009 9:53 pm |
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JimboD3
Member Since: 23 Mar 2009
Location: Hertfordshire
Posts: 348
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I've got a feeling that the rotary coupler on the steering column is a bit fubar'd as the ICE and phone controls intermittantly play silly whatsits - the stealer did a 'software update' at the last service........but it made jack-all difference - so perhaps this is the cause of the P0578 DTC ? Jim
Standard TDV6 HSE
Non-standard Td5 110 Hardtop
Club Traxide
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| 15th Dec 2009 10:01 pm |
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