Reading a fault code but can’t find the definition
09-04-2018, 07:41 AM
#1
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Reading a fault code but can’t find the definition
Just read a fault code on my 1993 Escort Cosworth YBT. It shows 4.4 which I can’t find the meaning. The car now runs smoothly from the start but gets cut at 4K rpm, obviously in limp mode. Any idea? Experts of ecu mostly welcomed!
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Cosworther (12-04-2018)
11-04-2018, 01:25 PM
#3
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does it mean my ECU is kind of a walking dead unit? Is it possible to fix?
Last edited by Cosworther; 11-04-2018 at 01:51 PM.
11-04-2018, 05:08 PM
#4
I've found that life I needed.. It's HERE!!
Yes, the CPU is the Motorola MC68HC11.
I have no idea about the possibilities in Taiwan.
Are there firms that repair engine controllers? Maybe they can get a replacement CPU.
That is, if they are even sold now, because it's a very old chip.
I have no idea about the possibilities in Taiwan.
Are there firms that repair engine controllers? Maybe they can get a replacement CPU.
That is, if they are even sold now, because it's a very old chip.
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Cosworther (12-04-2018)
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Cosworther (12-04-2018)
11-04-2018, 05:47 PM
#6
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Thank you very much, Oldford and Martin. Yes I know it’s very old and may not be able to find the chip here in Taiwan. There maybe only three or four Escort YBT left in Taiwan. Will try to ask some ECU repair shop anyway.
Wondering is it still possible to get the ECU fixed in UK? Or maybe the only way is to buy a used one from someone?
Wondering is it still possible to get the ECU fixed in UK? Or maybe the only way is to buy a used one from someone?
11-04-2018, 06:16 PM
#7
I've repaired them before. However this appears to require a new CPU, so obtaining the part is the issue.
Age is one thing, but also the engines which they manage, namely Cosworth's, some Fiat's and other Italian exotica which means they are as rare as the cars.
I believe you would require another ECU.
Martin
Age is one thing, but also the engines which they manage, namely Cosworth's, some Fiat's and other Italian exotica which means they are as rare as the cars.
I believe you would require another ECU.
Martin
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Cosworther (12-04-2018)
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11-04-2018, 06:37 PM
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Hi Oldford and Martin, Do you think these items on eBay works? 
https://www.ebay.com/itm/MC68HC11E1-...-/112380109271
MC68HC11E1CFNE2
https://www.ebay.com/itm/19250582497...m=192505824974
MC68HC11E1VFN
Both are 68HC11E1 and looks similar, some printed digits not the same. Are they functionally the same?
The attached photo is the 68HC11E1 in my ECU.
And I found two related datasheets but not fully understand it.
FYI
https://www.ebay.com/itm/MC68HC11E1-...-/112380109271
MC68HC11E1CFNE2
https://www.ebay.com/itm/19250582497...m=192505824974
MC68HC11E1VFN
Both are 68HC11E1 and looks similar, some printed digits not the same. Are they functionally the same?
The attached photo is the 68HC11E1 in my ECU.
And I found two related datasheets but not fully understand it.
FYI
Last edited by Cosworther; 12-04-2018 at 07:22 AM.
12-04-2018, 01:53 PM
#10
I've found that life I needed.. It's HERE!!
You need the MC68HC11E1VFN or MC68HC11E1MFN.
The latter has a higher operating temperature range. Both can handle a 12 Mhz XTAL.
The MC68HC11E1CFNE2 does not have an extended temperature range, so it could be a problem in hot whether. Also it cannot handle a XTAL higher than 8Mhz.
What does the XTAL have printed on it? I can't remember what it said.
The latter has a higher operating temperature range. Both can handle a 12 Mhz XTAL.
The MC68HC11E1CFNE2 does not have an extended temperature range, so it could be a problem in hot whether. Also it cannot handle a XTAL higher than 8Mhz.
What does the XTAL have printed on it? I can't remember what it said.
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Cosworther (12-04-2018)
12-04-2018, 03:44 PM
#11
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You need the MC68HC11E1VFN or MC68HC11E1MFN.
The latter has a higher operating temperature range. Both can handle a 12 Mhz XTAL.
The MC68HC11E1CFNE2 does not have an extended temperature range, so it could be a problem in hot whether. Also it cannot handle a XTAL higher than 8Mhz.
What does the XTAL have printed on it? I can't remember what it said.
The latter has a higher operating temperature range. Both can handle a 12 Mhz XTAL.
The MC68HC11E1CFNE2 does not have an extended temperature range, so it could be a problem in hot whether. Also it cannot handle a XTAL higher than 8Mhz.
What does the XTAL have printed on it? I can't remember what it said.
Sorry I am not sure which one is the XTAL. Is it the little silver metal parts in the picture I attached? If so, the "W80NDK1X:" is printed on the top surface. BTW XTAL means the crystal, right?
13-04-2018, 06:50 AM
#12
I've found that life I needed.. It's HERE!!
I am not sure this is the Crystal (XTAL).
I was expecting a different shape. See: http://bigturbo.co.uk/l1ecu.gif
The XTAL is the silver part with a wire soldered over it on the top in the middle next to the 2 screw holes in the casing. Normally the XTAL is very close to the CPU.
I was expecting a different shape. See: http://bigturbo.co.uk/l1ecu.gif
The XTAL is the silver part with a wire soldered over it on the top in the middle next to the 2 screw holes in the casing. Normally the XTAL is very close to the CPU.
13-04-2018, 07:09 AM
#13
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I am not sure this is the Crystal (XTAL).
I was expecting a different shape. See: http://bigturbo.co.uk/l1ecu.gif
The XTAL is the silver part with a wire soldered over it on the top in the middle next to the 2 screw holes in the casing. Normally the XTAL is very close to the CPU.
I was expecting a different shape. See: http://bigturbo.co.uk/l1ecu.gif
The XTAL is the silver part with a wire soldered over it on the top in the middle next to the 2 screw holes in the casing. Normally the XTAL is very close to the CPU.
Last edited by Cosworther; 13-04-2018 at 07:16 AM.
20-06-2018, 10:01 PM
#14
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I am not sure if this is source of your problem....
you can have damaged .bin inside eeprom 27C256.
what specs you are runing? chip? OE?
you need to try burn image into NEW 27C256 or disable checksum controll inside.
But personally I dont think that is the reason for cut in 4000 rpm.!
can be another problem!
you can have damaged .bin inside eeprom 27C256.
what specs you are runing? chip? OE?
you need to try burn image into NEW 27C256 or disable checksum controll inside.
But personally I dont think that is the reason for cut in 4000 rpm.!
can be another problem!
Last edited by midnight_man; 21-06-2018 at 05:52 PM.
21-06-2018, 05:09 PM
#15
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Thanks for advice. My eprom is stage 1 just bought from MSD. Been tested on another ECU without showing any fault code. That’s why I also think there is something wrong in my original ECU too.
24-02-2021, 08:32 AM
#24
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You need the MC68HC11E1VFN or MC68HC11E1MFN.
The latter has a higher operating temperature range. Both can handle a 12 Mhz XTAL.
The MC68HC11E1CFNE2 does not have an extended temperature range, so it could be a problem in hot whether. Also it cannot handle a XTAL higher than 8Mhz.
What does the XTAL have printed on it? I can't remember what it said.
The latter has a higher operating temperature range. Both can handle a 12 Mhz XTAL.
The MC68HC11E1CFNE2 does not have an extended temperature range, so it could be a problem in hot whether. Also it cannot handle a XTAL higher than 8Mhz.
What does the XTAL have printed on it? I can't remember what it said.
I have one more question about the MCU. If I can find a MC68HC11E1VFN or MC68HC11E1MFN and replace it, do I need to do something to the EEROM? such as to store some variables into the EEROM? Or simply replace it on the PCB?
13-04-2021, 03:12 AM
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