Electrical problem 940

[Laird Scooby]

Originally Posted by Ammorack

Yes I have that OBD1 I guess it’s called. I have faultcodes for missing or absent o2 sensor. It’s a new o2 sensor from Bosch. 120$

I haven’t tried the tps test yet. I have some errands to do now :/

When did you get that code? It's Volvos own fault code reader, definitely not OBD although it's a similar idea.

As you've pulled fuse #1 several times recently, if that was a historical code it should be clear but if the problem is overfueling for whatever reason, it will throw a Lambda sensor code, even if the sensor is fine. It will also default to Limp Home values so won't be running anywhere near as rich as yours is.

If you can do those test on those two wires later and let us know, we should have a few more clues.

[Ammorack]

Originally Posted by Laird Scooby

When did you get that code? It's Volvos own fault code reader, definitely not OBD although it's a similar idea.

As you've pulled fuse #1 several times recently, if that was a historical code it should be clear but if the problem is overfueling for whatever reason, it will throw a Lambda sensor code, even if the sensor is fine. It will also default to Limp Home values so won't be running anywhere near as rich as yours is.

If you can do those test on those two wires later and let us know, we should have a few more clues.

I meant that black box with blink-lights.
but that tps, how do I properly plug out those wires so I don’t bend those metal pins inside that housing thingy without damaging them?

[Laird Scooby]

Originally Posted by Ammorack

I meant that black box with blink-lights.
but that tps, how do I properly plug out those wires so I don’t bend those metal pins inside that housing thingy without damaging them?

Yes, that's Volvos Fault Code reader.

The connectors on the TPS should be simple 1/4" female spades, no rocket science on it. Should also be a brown one on it, depending what happens when you disconnect the other two, we might disconnect the brown one later with the other two still connected. If Volvo have done the unthinkable and put a different plug on it, without seeing it i don't know so you might have to upload a photo or two.

[Ammorack]

Originally Posted by Laird Scooby

Yes, that's Volvos Fault Code reader.

The connectors on the TPS should be simple 1/4" female spades, no rocket science on it. Should also be a brown one on it, depending what happens when you disconnect the other two, we might disconnect the brown one later with the other two still connected. If Volvo have done the unthinkable and put a different plug on it, without seeing it i don't know so you might have to upload a photo or two.

NOID light arrived and now I’ll test TPS
Noid light test shows that all four plugs are blinking. It’s blinking very slow on idle. No plugs shows a gap where there’s no light flashing. 3000rpm shows nothing wrong there. It’s blinking bright and fast on 3k rpm on all plugs. And all four plugs stops blinking when I let off the gas.

The TPS is sketchy for me to remove, I don’t wanna destroy those pins.
It looks bad inside that plug. I have tried to remove debris inside. No difference in idling

[Laird Scooby]

Originally Posted by Ammorack

NOID light arrived and now I’ll test TPS
Noid light test shows that all four plugs are blinking. It’s blinking very slow on idle. No plugs shows a gap where there’s no light flashing. 3000rpm shows nothing wrong there. It’s blinking bright and fast on 3k rpm on all plugs. And all four plugs stops blinking when I let off the gas.

The TPS is sketchy for me to remove, I don’t wanna destroy those pins.
It looks bad inside that plug. I have tried to remove debris inside. No difference in idling

Just unplug the TPS then, that's different to mine as far as i remember.

If you try revving above 3k rpm, does the NOID light continue flashing at a proportional rate?

[Ammorack]

Originally Posted by Laird Scooby

Just unplug the TPS then, that's different to mine as far as i remember.

If you try revving above 3k rpm, does the NOID light continue flashing at a proportional rate?

Yes, it’s still constant flashing

[Laird Scooby]

Originally Posted by Ammorack

Yes, it’s still constant flashing

What about with the TPS unplugged? Will it rev over 3k rpm?

Stupid question, have you checked the carbon brush inside the dizzy cap? If so when did you check it?

[Ammorack]

Originally Posted by Laird Scooby

What about with the TPS unplugged? Will it rev over 3k rpm?

Stupid question, have you checked the carbon brush inside the dizzy cap? If so when did you check it?

Sorry for late rely

I will try that soon with the TPS .

The dizzy cap and rotor are original Volvo parts. It’s new

[Laird Scooby]

Originally Posted by Ammorack

Sorry for late rely

I will try that soon with the TPS .

The dizzy cap and rotor are original Volvo parts. It’s new

Will you please check the carbon brush inside the dizzy cap? Doesn't matter if it's new, they can break at any time.

We could be chasing our tails trying to find a problem that is purely down to something stupid.

[Ammorack]

Originally Posted by Laird Scooby

Will you please check the carbon brush inside the dizzy cap? Doesn't matter if it's new, they can break at any time.

We could be chasing our tails trying to find a problem that is purely down to something stupid.

Sorry if I sound dumb to you guys :/

I have also experienced that the little thing that’s inside the rotor, that slides on the dizzy. Is small on aftermarket parts and big on original parts. I’ll check that dizzy out and I’ll also buy a shirt little 8mm wrench