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Marty
Marty, European Car Expert
Category: UK Car
Satisfied Customers: 395
Experience:  ASE & Bosch Certified Master Tech. Over 30 years experience.
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XC70 problem 'signal too high' on injectors

Customer Question

XC70 problem 'signal too high' on injectors
Submitted: 1 month ago.
Category: UK Car
Customer: replied 1 month ago.
Error from Vida: signal too high on injector 1,2, 5
Have additional faults: parking sensors 1 thru 4 have 'invalid' signal
ABS light started flashing
..all this followed a misfire on injector 2 (since replaced)
I have had the ECM tested
Wiring loom to injectors seems to be fine
Connections between injector & loom are ok
Car is misfiring. It's a 185HP D5
Expert:  david craig replied 1 month ago.

Hi Im David, Signal too high:
Short-circuit to supply voltage in the signal cable.
Defective injector.

Customer: replied 1 month ago.
Thanks. First one: how many ohms should the injector read? 2nd - any key places the wiring loom rubs on the V70? I've taken the ECU/injector loom apart & it looks OK
Expert:  david craig replied 1 month ago.

let me find that info. i do know that the plugs to them are a problem and the terminals get corroded. we just splice in new pig tails.

Customer: replied 1 month ago.
Cheers. I've changed one of the plugs - no change in error code though.
Expert:  david craig replied 1 month ago.

injectors shoud read 12.8-14.5 ohms

Customer: replied 1 month ago.
Thanks - I'll check them. Are there any points on the loom where it rubs please?
Expert:  david craig replied 1 month ago.

not that im aware of, but a visual check is always good.

Customer: replied 1 month ago.
Cheers. Any chance it's something weird like the parking sensors disrupting communications? I've had some odd faults with other cars before :-)
Expert:  david craig replied 1 month ago.

no. i see where you have that problem but it wont affect the injector circuit

Customer: replied 1 month ago.
Any ideas on the flashing ABS light please?
Expert:  david craig replied 1 month ago.

sure, hold on a sec, thanks

Expert:  david craig replied 1 month ago.

sounds like you have a fuse for the abs blown. ill try to find a diagram to point out which fuse.

Expert:  david craig replied 1 month ago.

check the fuse panels under the hood and in the passenger compartment for any that are labeled abs or brake control. look in the owners manual under fuses. i cant seem to find any labeled strictly for abs. sorry

Customer: replied 1 month ago.
Thanks. Apologies, but are you sure about the resistance of the injectors? I'm only getting 0.5 Ohms. It's a D5 diesel with Bosch injectors
Expert:  david craig replied 1 month ago.

.5 ohms? thats not correct. it doesnt matter what injectors you are using. try one thats reading good, 3 or 4

Customer: replied 1 month ago.
Hiya - they are all reading 0.5 ohms. Maybe it's the multimeter! What do you think next - remove & get the injectors tested?
Expert:  david craig replied 1 month ago.

the injectors are reading .5 ohms disconnected?

Customer: replied 1 month ago.
disconnected
Expert:  david craig replied 1 month ago.

i gotta look at the specs for those. give me the part numbers if you can

Customer: replied 1 month ago.
HiBosch part number(###) ###-####251Thanks
Expert:  david craig replied 1 month ago.

I can not find anywhere it gives me the resistance specs for those injectors. you may need to contact bosch directly.

Customer: replied 1 month ago.
Just sent them off for testing. One final question please: have you ever come across control modules failing and causing this issue? Online stuff reckons the CEM can cause it. Thanks for your help btw
Expert:  david craig replied 1 month ago.

i have not. but let me dig

Expert:  david craig replied 1 month ago.

you would get a fuel code from the cem i would think

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