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Volvo5.0

Sas (Air Pump) Delete....write-Up With Pics

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ARD - Lucky, on 06 June 2012 - 09:51 PM, said:

It's called a Zener diode. but easier to delete in the software :)

And solder it where?

I want THIS.

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98 V70 t5 w/ 224k I've tried all the suggestions to delete the SAS P0410 soldered in the diode in the wire harness, and unplugged the air pump and I've replaced both o2 sensors and I'm still getting a P0410 code. I've left the solinoid and relay intact as suggested. I've got a NYS inspection due next month so any help would be greatly appreciated.

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98 V70 t5 w/ 224k I've tried all the suggestions to delete the SAS P0410 soldered in the diode in the wire harness, and unplugged the air pump and I've replaced both o2 sensors and I'm still getting a P0410 code. I've left the solinoid and relay intact as suggested. I've got a NYS inspection due next month so any help would be greatly appreciated.

Do you have any pictures of the diode soldered into the wiring harness? Diode pointing the right way? Tapped into the correct wires?

Should look like this....

diodeunderecu.jpg

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Yes mine does look like the Pic above, I even use the same color coded wires for for my diode to be sure that the wires were connected correcly and I tested the diode for current flow before soldering to be sure that it would go from 32 to 37.

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hmmmm did you check it after soldering? e.g. test resistance, you could have cooked the diode. Just something to consider.

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What should the resistance be? Current flow should be from anode to cathode right. The diode from Radio Shack is so small (approx 1/8 ") that it was almost impossble to see any markings on it so before soldering I connected 1 wire which I thought was the anode side of the diode to a 1.5 volt AA battery then measured the voltage on the other side and got 1.0 volt then I soldered the wires to it and installed the diode.

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Just got another diode and install it into the ECU. Then you know 100% that it's correct.

In my opinion splicing into the wiring is just asking for trouble and requires twice as much work.

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Works perfect. I've done it on about 6-7 vehicles with thousands of miles on all of the diode mods. All in te family, so I've been able to check codes.

Did you put it in the ECU? Like I said forget the wiring!

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No I didn't because it was mentioned earlier that installing it in the wire harness allows the mod to stay w/ the car in case the ecu was changed. I'll try the ecu mod next but I'll get new diode. Just to go over it again what is the proceedure for determining pin 32 and 37?

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If you unplug the solenoid over the radiator fan, it will throw a code immediately based on my experience. I have a resistor-soldered ECU and removed the pump without any codes. I later tried to remove the solenoid and got a 410 code immediately. Plugged it back in and I was fine.

Your solenoid may be bad. Junkyard can fix that.

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You can test the solenoid. If it has 30-40ohms or resistance it's fine. Also instead of getting another solenoid, just install a resistor of 30-35ohms in place of the solenoid.

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