'96 940 ecu?

tac12 · Jul 25th, 2023, 13:00

My 940 has been off the road due to mysterious fault whereby ignition system appears all to be functional but the injectors are not "firing". Recently someone suggested an ECU (Bosch 0280000976) fault. Since these appear to be unavailable does anyone have recommendations for repair/checking?

lynns hubby · Jul 25th, 2023, 14:41

Tap a search in google for ECU repairs.

classicswede · Jul 25th, 2023, 21:31

976 is B230FT/FK no imobiliser

ECU faults are very rare.

Is the fuel pump running? If not could be fuel pump relay causing the issue

If ECU is the only thing you have left I am happy to test it for you

tac12 · Jul 25th, 2023, 21:56

Yes fuel pump is running (although I don't have pressure reading).

AA man (very good) checked out it out. He put a test device on the injector line and confirmed no "signal". All other bits of ignition OK.

Yes ECU fault seems to be the last option?

classicswede · Jul 25th, 2023, 23:07

There are other things it could be but would be nice to either test the ECU or try another ecu to confirm

tac12 · Sep 4th, 2023, 13:26

Quote:

Originally Posted by classicswede

There are other things it could be but would be nice to either test the ECU or try another ecu to confirm

Sadly ECU fault confirmed by repairers who report its not reparable 😢

TonyS9 · Sep 4th, 2023, 18:59

I still wouldn't trust someone who says they can't repair it.

As Dai says its the wrong ECU for a 96, but maybe its really a 95. Does the Engine have EGR or an internal OBDII socket?

Can the injectors be driven directly, ie just grounding the big grey wire going to the ECU. Maybe there is a problem with the wiring or injectors. They are basically connect to 12V Via the radio suppression relay (which is just a relay used to isolate the electrical noise for the radio). You should get 12V at the injectors with ignition on, from this relay. Its a common fault, and you can just bypass it temporarily.

Still assuming it is faulty it shouldn't be that hard to find another, try a breaker on ebay.

Jul 25th, 2023, 13:00	#1
tac12 New Member Last Online: Oct 31st, 2023 12:15 Join Date: Jul 2023 Location: Cambridge	'96 940 ecu? My 940 has been off the road due to mysterious fault whereby ignition system appears all to be functional but the injectors are not "firing". Recently someone suggested an ECU (Bosch 0280000976) fault. Since these appear to be unavailable does anyone have recommendations for repair/checking?

Jul 25th, 2023, 21:31	#3
classicswede Trader Volvo in my veins Last Online: Apr 26th, 2024 23:53 Join Date: Dec 2004 Location: Anglesey	976 is B230FT/FK no imobiliser ECU faults are very rare. Is the fuel pump running? If not could be fuel pump relay causing the issue If ECU is the only thing you have left I am happy to test it for you __________________ http://www.classicswede.org www.classicswede.co.uk

Jul 25th, 2023, 23:07	#5
classicswede Trader Volvo in my veins Last Online: Apr 26th, 2024 23:53 Join Date: Dec 2004 Location: Anglesey	There are other things it could be but would be nice to either test the ECU or try another ecu to confirm __________________ http://www.classicswede.org www.classicswede.co.uk

Jul 25th, 2023, 14:41	#2
lynns hubby Master Member Last Online: Apr 25th, 2024 11:15 Join Date: Oct 2011 Location: Great Yarmouth	Tap a search in google for ECU repairs.

Jul 25th, 2023, 21:56	#4
tac12 New Member Last Online: Oct 31st, 2023 12:15 Join Date: Jul 2023 Location: Cambridge	Yes fuel pump is running (although I don't have pressure reading). AA man (very good) checked out it out. He put a test device on the injector line and confirmed no "signal". All other bits of ignition OK. Yes ECU fault seems to be the last option?

Sep 4th, 2023, 18:59	#7
TonyS9 Premier Member Last Online: Apr 9th, 2024 21:44 Join Date: Jul 2009 Location: Holywood	I still wouldn't trust someone who says they can't repair it. As Dai says its the wrong ECU for a 96, but maybe its really a 95. Does the Engine have EGR or an internal OBDII socket? Can the injectors be driven directly, ie just grounding the big grey wire going to the ECU. Maybe there is a problem with the wiring or injectors. They are basically connect to 12V Via the radio suppression relay (which is just a relay used to isolate the electrical noise for the radio). You should get 12V at the injectors with ignition on, from this relay. Its a common fault, and you can just bypass it temporarily. Still assuming it is faulty it shouldn't be that hard to find another, try a breaker on ebay.

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