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S80 '98-'06 / S60 '00-'09 / V70 & XC70 '00-'07 General Forum for the P2-platform S60 / V70 / XC70 / S80 models |
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Fuel Pump Fuse Blowing ConstantlyViews : 2930 Replies : 15Users Viewing This Thread : |
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Nov 24th, 2015, 11:58 | #11 |
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Nov 24th, 2015, 12:10 | #12 |
Brick Pilot
Last Online: Apr 10th, 2024 22:35
Join Date: Apr 2008
Location: North Yorks
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I have a fuel filter ready to fit. When I swapped the pump it was the complete unit, I had to take out the sender and feed the pickup and wiring through.
Thanks everyone, I'll keep you posted
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‘87 740 Saloon B230K Previous custodian of the following '03 V70R AWD Manual '98 V70 AWD B5254T Manual, sadly no more
‘95 940 LPT Celebration Estate, '88 740 B230FK Estate, '90 340 1.7 |
Nov 24th, 2015, 13:05 | #13 |
Master Tech
Last Online: May 18th, 2020 10:57
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Location: On Contract Dubai Automotve Technical Academy
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Your problem will have nothing to do with a "bad earth", a poor earth prevents current from flowing in a circuit. When a fuse blows you are looking for a short to ground which will be before the electrical load. A power feed which touches ground before the load component has a circuit with very low resistance which means high current flow being more than your 15 amp fuse can handle.
The fault could be between the CEM and the pump control module or the control module and the pump. The pump control module receives a power feed at key on via relay 2/23 in the CEM, the relay receives a permanent live feed via fuse 33. Remove the relay and disconnect the pump module connector. With a test connect a test light across the relay bed pins 3 & 1. If the light is lit up you have a short to ground between the CEM and the control module. Follow the harness and flex it every inch along its length from CEM to module. At the point where the light goes out you have located the short to ground. If you can confirm this section of the circuit I will give guidance on locating a short between control module and the pump as a slightly different approach is needed. |
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Nov 24th, 2015, 13:17 | #14 |
Brick Pilot
Last Online: Apr 10th, 2024 22:35
Join Date: Apr 2008
Location: North Yorks
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Thank you very much KBB I shall have a look tonight when I get in from work
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‘87 740 Saloon B230K Previous custodian of the following '03 V70R AWD Manual '98 V70 AWD B5254T Manual, sadly no more
‘95 940 LPT Celebration Estate, '88 740 B230FK Estate, '90 340 1.7 |
Nov 25th, 2015, 07:33 | #15 |
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Nov 26th, 2015, 19:36 | #16 |
Brick Pilot
Last Online: Apr 10th, 2024 22:35
Join Date: Apr 2008
Location: North Yorks
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Right, done a bit more digging on my non-start issue. I now have a VIDA DICE units thanks to a fellow forum member, all running and installed on an old Windows 7 laptop.
Plugged it in last night, ran the diagnostics and got this DTC. ECM-2120 Fuel pump control module - Signal too low This relates to the Pump Electronic Module that many of you have suggested and is borne out by a lot of research via the forums and the internet. I changed the fuel filter as it needed doing anyway, whilst I was under the car I had a look at the PEM and superficially it looked OK. I popped it off as it just slides into a bracket under the car, the terminals looked OK on the block connector, but given what I've read I decided to open it up. The PEM has a plastic housing with a rubber seal and a heatsink. The cover pops off if you take a little care, it is not a sealed unit. This is what I found inside, accompanied by a whiff of fried electrical components. Methinks I have found the culprit! I'm now on the hunt for a replacement. Thanks for the help everyone
__________________
‘87 740 Saloon B230K Previous custodian of the following '03 V70R AWD Manual '98 V70 AWD B5254T Manual, sadly no more
‘95 940 LPT Celebration Estate, '88 740 B230FK Estate, '90 340 1.7 |
The Following User Says Thank You to RWD For This Useful Post: |
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fuel pump, fuse, pem, pump electronic module, v70 |
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