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Old 11-29-2018, 04:29 PM   #1
smeha
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Default Adjusting mixture on LH2.2

Hello TBers,
Planning to adjust mixture or see if it's set right.
There is a thing called "Volvo special tool part #9995280"
As I can tell it's hard to come by this one, so would something like circuit tester with led would work? Ex: https://www.amazon.com/OEMTOOLS-2588...3523007&sr=8-9
If not, any suggestions?
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Old 11-29-2018, 04:45 PM   #2
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https://www.brickboard.com/FAQ/700-9...ettingBaseIdle
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Old 11-29-2018, 04:45 PM   #3
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Here's mine. It is quite literally just an LED soldered to two wires. One goes to the pink wire in that 2 wire connector I was telling you about, and the other goes to the positive terminal on the battery. As you turn the adjustment pot on the AMM it will blink on and off. You adjust it until it is staying on about the same amount of time as off... a constant steadyish blink... I would think any LED light would work...so your link would probably work although it may be overkill. You want the car to be thoroughly warmed up when you do this.
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Old 11-29-2018, 06:35 PM   #4
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Quote:
Originally Posted by intothelabyrinth View Post


Here's mine. It is quite literally just an LED soldered to two wires. One goes to the pink wire in that 2 wire connector I was telling you about, and the other goes to the positive terminal on the battery. As you turn the adjustment pot on the AMM it will blink on and off. You adjust it until it is staying on about the same amount of time as off... a constant steadyish blink... I would think any LED light would work...so your link would probably work although it may be overkill. You want the car to be thoroughly warmed up when you do this.
Thank you, so as one go on test wire, so the other one goes to the ground right?
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Old 11-29-2018, 06:47 PM   #5
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Originally Posted by hiperfauto View Post
That's what I've been looking, so it's not just LED it is also the 750 OHM resistor matching wattage to the LED.
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Old 11-29-2018, 06:49 PM   #6
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One side goes to the test connector (red or pink wire) and the other side goes to 12v... Basically the ecu grounds the test connection when it senses a rich condition, which lights up the light, then un-grounds it when its lean. It should cycle rich for a sec, then lean, back and forth.
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Old 11-29-2018, 06:51 PM   #7
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Quote:
Originally Posted by intothelabyrinth View Post
One side goes to the test connector (red or pink wire) and the other side goes to 12v... Basically the ecu grounds the test connection when it senses a rich condition, which lights up the light, then un-grounds it when its lean. It should cycle rich for a sec, then lean, back and forth.
Yeah, I misspoke. I was already looking at the diagram of led test light, but why you didn't use resistor in your picture? Did this setup works better or same?
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Old 11-29-2018, 07:30 PM   #8
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The resistor is just to protect the LED in case you accidentally just short it to ground too long. It is not needed.
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Old 11-29-2018, 07:45 PM   #9
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Quote:
Originally Posted by intothelabyrinth View Post
The resistor is just to protect the LED in case you accidentally just short it to ground too long. It is not needed.
Understood. Thank you!
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