Resetting 850 GLT 20V 93 Trip computer - Page 2

Chris_Rogers · Jul 15th, 2009, 21:37

Instruments are on a different list.

They are all in the 850 Hynes manual you can post them here for help.

Jod T5 · Jul 15th, 2009, 23:58

Instrument panel (A7) is different from A2/A6....

Jod

charlotte001 · Jul 16th, 2009, 18:31

Ive read the codes from A7 and it returns one this is 1-2-2 saying that the temperature signal is too long.

Jod T5 · Jul 18th, 2009, 09:47

Quote:

Originally Posted by charlotte001

Ive read the codes from A7 and it returns one this is 1-2-2 saying that the temperature signal is too long.

This may be linked to your fuel and temp issues....

Try inserting flylead into A7 and press button 3 times...
Then look at the instrument panel, paying particular notice to the position of the fuel and temp needles...

Possable Causes:
Defective earth to instrument panel
Defective Temp Sensor
Defective Temp Gauge

Jod

charlotte001 · Jul 18th, 2009, 11:06

Ok thanks for that I will have a look today [between the thunderstorms]

How long do I press the button for or doesnt it matter as long as it 3 times?

Charlotte

Jod T5 · Jul 19th, 2009, 11:16

Quote:

Originally Posted by charlotte001

Ok thanks for that I will have a look today [between the thunderstorms]

How long do I press the button for or doesnt it matter as long as it 3 times?

Charlotte

Hi
Yes three sharp, brief press' will be cool

Jod

charlotte001 · Jul 19th, 2009, 15:04

Ive ran the test by inserting fly lead into A7 then pressing the button 3 times

Everything moved to the following:

Temp full
Fuel Gauge half way
RPM 3500
Speed 70

Advice on the next step please

Charlotte

Jod T5 · Jul 19th, 2009, 16:09

Quote:

Originally Posted by charlotte001

Ive ran the test by inserting fly lead into A7 then pressing the button 3 times

Everything moved to the following:

Temp full
Fuel Gauge half way
RPM 3500
Speed 70

Advice on the next step please

Charlotte

That is what it should be, indicating to me that i would expect the is a issue with the fuel consumption signal from the ECM into the microprocessor or a problem with the microprocessor itself...
That said it could well be a problem with your fuel level sensor which is where i would start..Is the gauge accurate?...of course you may never know unless you run out of petrol...
I would drive the car with a gallon in the boot...
Run out and refil from boot can..
Fill up with 35 litres ASAP
Check the resistance on the sensor connections expecting to find a resistance of 150...ish ohm
Failing that get a calculator and work out MPG the old fashioned way..lol
Jod

Chris_Rogers · Jul 19th, 2009, 16:46

You could do worse than removing the Engine management ECU(s) from the box left or the radiator and making sure the contacts are clean.
Dissconnect the battery and leave for 10 minuites before you do this.
Remember the radio code.

charlotte001 · Jul 19th, 2009, 16:58

the MPG is around 23-25 to the gallon working out the calculation thus

£30 of petrol at 103.9 = 28.87 litres / 4.54 = 6.4 gallons

149.5 miles /6.4 = 23.35 mpg average

I do not drive slow, legal but not slow, 40 miles at 70mph with the sport button engaged, 70 miles towing an old 1981 caravan.

I will check the fuel sender at the tank end before I start removing ECU's

Charlotte

Jul 15th, 2009, 23:58	#12
Jod T5 Phoenix from the ashes Last Online: Apr 24th, 2024 01:05 Join Date: Jan 2006 Location: Finchingfield	Instrument panel (A7) is different from A2/A6.... Jod __________________ Dum Spiro Spero VOC 20419

Jul 16th, 2009, 18:31	#13
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	Trip computer Ive read the codes from A7 and it returns one this is 1-2-2 saying that the temperature signal is too long. __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Jul 18th, 2009, 11:06	#15
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	resetting trip computer Ok thanks for that I will have a look today [between the thunderstorms] How long do I press the button for or doesnt it matter as long as it 3 times? Charlotte __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Jul 19th, 2009, 15:04	#17
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	Resetting Trip Computer Ive ran the test by inserting fly lead into A7 then pressing the button 3 times Everything moved to the following: Temp full Fuel Gauge half way RPM 3500 Speed 70 Advice on the next step please Charlotte __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Jul 19th, 2009, 16:58	#20
charlotte001 Premier Member Last Online: Jul 26th, 2012 11:13 Join Date: Jul 2009 Location: norwich	resetting trip computer the MPG is around 23-25 to the gallon working out the calculation thus £30 of petrol at 103.9 = 28.87 litres / 4.54 = 6.4 gallons 149.5 miles /6.4 = 23.35 mpg average I do not drive slow, legal but not slow, 40 miles at 70mph with the sport button engaged, 70 miles towing an old 1981 caravan. I will check the fuel sender at the tank end before I start removing ECU's Charlotte __________________ Previous Volvos:850 GLT 2.5 20V Auto Saloon Silver. 1997 850 T-5 Auto Estate Nautic Blue Chipped ECU, V70 TCV, Carbon Cased Filter, 17inch alloys, Rattling Engine masking the suspension rattles. Engine doesn't rattle anymore

Jul 15th, 2009, 21:37	#11
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	Instruments are on a different list. They are all in the 850 Hynes manual you can post them here for help.

Jul 19th, 2009, 16:46	#19
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	You could do worse than removing the Engine management ECU(s) from the box left or the radiator and making sure the contacts are clean. Dissconnect the battery and leave for 10 minuites before you do this. Remember the radio code.

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