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Marty
Marty, European Car Expert
Category: UK Car
Satisfied Customers: 407
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: 12 months ago.
Category: UK Car
Customer: replied 12 months 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 12 months ago.

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

Customer: replied 12 months 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 12 months 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 12 months ago.
Cheers. I've changed one of the plugs - no change in error code though.
Expert:  david craig replied 12 months ago.

injectors shoud read 12.8-14.5 ohms

Customer: replied 12 months ago.
Thanks - I'll check them. Are there any points on the loom where it rubs please?
Expert:  david craig replied 12 months ago.

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

Customer: replied 12 months 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 12 months ago.

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

Customer: replied 12 months ago.
Any ideas on the flashing ABS light please?
Expert:  david craig replied 12 months ago.

sure, hold on a sec, thanks

Expert:  david craig replied 12 months 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 12 months 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 12 months 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 12 months ago.

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

Customer: replied 12 months 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 12 months ago.

the injectors are reading .5 ohms disconnected?

Customer: replied 12 months ago.
disconnected
Expert:  david craig replied 12 months ago.

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

Customer: replied 12 months ago.
HiBosch part number(###) ###-####251Thanks
Expert:  david craig replied 12 months ago.

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

Customer: replied 12 months 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 12 months ago.

i have not. but let me dig

Expert:  david craig replied 12 months ago.

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