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S90 Transmission question...

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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anbran1
Posts: 61
Joined: 25 November 2011
Year and Model: 1999 XC70
Location: Rockwood, Ontario

S90 Transmission question...

Post by anbran1 »

I notice that I have no first gear (or very sluggish) when I start from stop. Once I get to highway speed...goes along fine. The amber transmission arrow started flashing at the same time...
Whats it sound like? Dirty fluid? Dirty filter?!

1998 S90

precopster
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Post by precopster »

Why don't you pull the dipstick and take a look? Be sure engine is running and car is in Park. It's a small square yellow headed handle. To release it you need to pull back the metal spring clip just underneath the yellow square.

It's located deep down in between the engine/trans on your driver's side. Slipping can be remedied by new fluid if you catch it early.

If you continue to drive with a slipping transmission burned out clutches will result (and a huge repair bill of course)

FCP Euro sell the filter/pan gasket sets for under $20. If fluid is low/burned a full drain and fill is recommended. You can do this by releasing the bottom cooler hose on the radiator and run the engine to slowly pump out the old fluid into a 2 litre milk container. Each time you fill it cut the engine and replace 2 litres back in through the dipstick tube (you'll need a length of 15mm plastic hose and a funnel because of the location of the dipstick)

Do this procedure until the fluid comes out clean.
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design

jimmy57
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Post by jimmy57 »

Dirty fluid does not directly cause the arrow to flash. That is an indication of the trans control module detecting a fault. The fault might be a stuck solenoid or something fluid could have caused. Before you waste time and money get the codes read.

anbran1
Posts: 61
Joined: 25 November 2011
Year and Model: 1999 XC70
Location: Rockwood, Ontario

Post by anbran1 »

I wonder why they made it so difficult to check the trans fluid?! I nearly tore my arm off getting to the little dipstick...
Anyway, the dipstick is clean and the fluid is bright red and appears to be full. (I checked it with the car in Park...engine NOT running.)
The fella I go it from recently said he always just flushed the trans fluid by the cooler lines...He had never changed the filter. (He had it for 8 years and put 283,000 km on it...The car has a total of 450,000 km.)

Is it possible that the filter has "expired" even though the fluid appears nice and clean?!

precopster
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Post by precopster »

The filter is not a "filter" as such just a metal casing designed to catch sediment.

Always check with engine RUNNING as per user manual. Surprised you even got a reading with engine off.

Yes as jimmy said get the codes read. One of the soleniods may be sticking. Solenoids are quite easy to replace on this trans once the pan & filter are removed, though it's a messy job with fluid dripping on you as you replace them:x
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design

anbran1
Posts: 61
Joined: 25 November 2011
Year and Model: 1999 XC70
Location: Rockwood, Ontario

Post by anbran1 »

What about that LUCAS transmission additive? Does that work too? Also...will my OBDII scanner read transmission codes?

precopster
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Post by precopster »

I have heard of Lucas treatment fixing some problems but first thing to do is scan. Not all OBDII readers were made equal so it all depends on what you have there.

The Autels all seem to work very well with that age of Volvo.

If you have a sticky solenoid depending on what Lucas does it may place a coating on components and help them glide over each other.

Tolerances in solenoids can be tight (it's similar in design to a piston going up and down a cylinder wall, except it's electrically driven and spring loaded toward return) so another coating may make them worse.

I would read the product info sheet from Lucas very carefully to see exactly what situations it will assist with.
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design

anbran1
Posts: 61
Joined: 25 November 2011
Year and Model: 1999 XC70
Location: Rockwood, Ontario

Post by anbran1 »

Ok...My OBDII reader brought out the following codes...

PO410 and PO705

PO410 refers to the air pump...

PO705 seems to refer to the PNP switch. Will a failed PNP switch give me the symptoms of no first gear?

Are PO410 and PO705 related in any way??

precopster
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Post by precopster »

PNP is EASY on a 960.

It's on the exhaust side of the trans and held in position with a 12mm bolt. Remove this bolt which also adusts the resting angle/calibration of the PNP. There's also a large 21 or 22mm nut holding it on in the centre which has a bendable cage which holds the nut from loosening. The connector goes over the top of the trans and from memory to a square connector.

If you plan to clean and re-adjust it just follow the excellent Volvo 850 PNP cleaning thread in the repair database as it's similar internally to one of those.

When refitting just place the car in reverse with ignition ON and get someone to tell you when the reverse lights are on then centre the PNP switch from clockwise to counterclockwise with the 12mm bolt to ensure the reverse lights stay on.
Current cars VW Transporter 2.5TDI, 2010 XC90 D5 R Design

anbran1
Posts: 61
Joined: 25 November 2011
Year and Model: 1999 XC70
Location: Rockwood, Ontario

Post by anbran1 »

I've discovered it is in fact the PNP switch. I was advised to operate the gear selector through all the gears, back and forth, to re-distribute the lubricant on the switch internals. I erased the trouble code and the transmission operates normally again...

This will be buy me some time I feel...and then look at the idea of cleaning and re-lubing the old switch or just replace it when I get the chance...

Thanks for the help!

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