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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

Volvo XC70 D5 (2008) (EURO) Voltage references

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1 year 10 months ago #63707 by NzzA
Volvo XC70 D5 (2008) (EURO) Voltage references was created by NzzA
Hi,

Currently helping a mate with a problem on a Volvo XC70 Diesel from 2008.
The problem is that on pin B16 at the ECU, the 5V is not stable (4-5V) and on pins A21 and 40 at the ECU, the 12V is in the range of 7-10V.

The swirlflaps are going insane, and the shutoff valve is doing strange things as well.
Somebody seen this before, and has a clue?

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1 year 10 months ago #63709 by derekoliveira
Replied by derekoliveira on topic Volvo XC70 D5 (2008) (EURO) Voltage references
Voltage drop to the ECU?! What about battery voltage with engine running?

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1 year 10 months ago #63710 by NzzA
Replied by NzzA on topic Volvo XC70 D5 (2008) (EURO) Voltage references
Checked everything. Motor running or not. Supply to the ECU is rock solid, and there is no voltage drop on the ground. Pin B16 is still wrong, but pin A21 and 40 are a ground switched control signal as we know now.

We are thinking the computer is bad.

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1 year 10 months ago #63720 by NzzA
Replied by NzzA on topic Volvo XC70 D5 (2008) (EURO) Voltage references
We found the problem. There was another sensor on the 5V line, the combined oil level / temperature sensor, which was pulling down the 5V line.

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