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post #1 of 4 (permalink) Old 06-02-2003, 20:06 Thread Starter
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SLS Compressor - Servicing the damn thing

I have a 1989 DA LTD and over the course of many weekends I have been fixing the SLS to work again and was successful after a few trips to the wreckers.

I know most people think the SLS is shit and get rid of it but you can fix it yourself with a couple of hours, and thats the point.

The following paragraph is how to service the compressor if you nail it down to this is where the problem is using the SLS self diagnostic test, and reason for this post.

It can be serviced. Ford says it cant but its a crock of shit. Take the damn thing out and then take it apart. Note where the wiring goes and dont stuff up here. The solenoid inside the compressor will die if you pass current to it the wrong way.

1. Look at the graphite rings on the piston and check for leakage
2. Remove the solenoid and check O ring
3. Remove and replace inner air filter - this normally blocks and fails causing the SLS to fail. On both of the compressors (fitted & spare part unit sourced from wreckers) this was the cause of the lack of air being passed to the shockers.
4. Check motor for operation. Is a Bosch so shouldnt fail.
5. You can sand the rust of the damn thing but be careful. Use wet & dry.
5. Put it all back together applying heat resistant liquid gasket where required. Replace defective parts with parts sourced from wreckers.
6. Replace the dryer with something a little newer from wreckers. There is some sort of pressure valve within this but you cant undo it. It has to be replaced. Check the seals at both ends when refitted for leakage with detergent water.

The rest is up to you. Always check your air shockers first especially the one next to the exhaust and check for a failed T piece behind the back right seat.

Somebody else can provide the SLS dianostic signal results as I have forgotten them.

My car has 285K on the clock and has had the air shockers replaced twice and only now have I had problems with the compressor. I dont use it to tow anything of weight.
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post #2 of 4 (permalink) Old 06-03-2003, 04:42
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Good to see another SLS supporter. I can vouch for the air leaks caused by leaking exhausts and blocked compressor filters - should be a periodic service item.

SLS self test codes:

No Flashes; Blown warning lamp;, no power to warning lamp; faulty wiring between height control box and warning light (loose connections); or no power to height sensor.

One Flash: Compressor faulty; processor thinks vehicle is alraedy at full height and will not do raise test; car overloaded; height sensor at differential not connected; air leaks (hoses or shockies); bad earth at height sensor; no power to height sensor;compressor relay failed,

Two Flashes: Exhaust valve faulty;Self test riutine finds vehicle already in raised position; height sensor link; exhaust vent solenoid; exhaust vent filter blocked; heoght sensor failed.

Three Flashes: Height sensor faulty;module failed.

Four Flashes: Passed All OK.

Lamp stays on: Faulty control unit.

Five or more flashes: driver intoxicated or can't count.

Self test is initiated bt pressing the door pillar courtesy light switch 3 times in one second with ignition on and driver sitting in drivers seat. Test will raise and lower vehicel and take just over a minutes.

Regards Blue
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post #3 of 4 (permalink) Old 06-03-2003, 06:47
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You bloody beauties. I might pinch this for the tech pages. If you're willing to write up a separate little tutorial on it that goes into a little more detail, that would be great.

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post #4 of 4 (permalink) Old 06-03-2003, 18:00 Thread Starter
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I will leave the tutorial for Alex to you as not to good at giving instructions.
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