Overdrive problem
#1
Overdrive problem
I have a 91 740 Turbo wagon. The overdrive is not working. The overdive over-ride switch and lite both work. This was an intermitent problem that is now a hard failure. One side issue - the speedometer is not currently working - could this effect the overdrive?
Thanks
Lee
Thanks
Lee
#3
more data
The switch and light are good (i.e. the switch toggle the light on and off but with no effect on the overdrive function). The electrical diagram ( from alldata.com) shows a connection from the speedo to the relay.
What exactly does the overdrive solenoid do? Does the transmission determine when to shift into overdrive? [If so, does an energized solenoid enable or disable the overdrive function?
Thanks for any help.
Lee
What exactly does the overdrive solenoid do? Does the transmission determine when to shift into overdrive? [If so, does an energized solenoid enable or disable the overdrive function?
Thanks for any help.
Lee
#4
I assume this is an automatic? There isn't a connection between the speedo and the OD function. The OD circuit for the 240 and the 740 is generally the same (minor difference regarding the light and which fuse is used).
When you turn the key on, 12V is applied to the OD solenoid through the realy. It retracts and allows fluid to flow between two small holes in the transmission, and allows shifts into 4th gear around >40 MPH.
When you push the button the arrow in the cluster lights up and power is removed from the solenoid. The passage of fluid between the holes is blocked and the OD fuction is turned off.
So if the OD doesn't work its because power isn't getting to the solenoid (fuse, relay, or exposed wires), or the solenoid is broken, or you have a problem with the transmission fluid.
I permanently enabled OD on my car by grinding a channel in my non-functional solenoid. IPD sells a kit that does the same exact thing.
http://www.ipdusa.com/Volvo-200/Tran...-266-672-1891/
Note that the OD function is inverse between autos and manuals.
When you turn the key on, 12V is applied to the OD solenoid through the realy. It retracts and allows fluid to flow between two small holes in the transmission, and allows shifts into 4th gear around >40 MPH.
When you push the button the arrow in the cluster lights up and power is removed from the solenoid. The passage of fluid between the holes is blocked and the OD fuction is turned off.
So if the OD doesn't work its because power isn't getting to the solenoid (fuse, relay, or exposed wires), or the solenoid is broken, or you have a problem with the transmission fluid.
I permanently enabled OD on my car by grinding a channel in my non-functional solenoid. IPD sells a kit that does the same exact thing.
http://www.ipdusa.com/Volvo-200/Tran...-266-672-1891/
Note that the OD function is inverse between autos and manuals.
Last edited by bubba240; 05-20-2009 at 02:14 PM.
#5
Bubba, I have a '90 240 DL. The overdrive stopped working completely but the light on the dash and the relay are both working. Checked the fluid and was half a quart low. Re-filled to proper level and replaced the OD solenoid with one from the used parts emporium lol. Now the OD is working but doesn't kick into 4th until around 60 or 65mph. Before it would kick in by 40 or 45mph at the most. Do you think the trani is damaged or maybe need a new OD solenoid? Thanks Jim
#7
#8
Don't forget the overdrive relay, known for issues as they age. Overdrive soleniod is often a culprit, fluid issues can affect them. I once lost overdrive in my wagon for ashort while when towing a boat, fluid overheated a little and possibly foamed resulting in no overdrive.
Regards, Andrew.
Regards, Andrew.
#9
#11
1987 overdrive issue.
Yeah, I finally figured out where the noise was coming from. I have quite a time with locating noises as I wear hearing aids and the receivers hang over the back of the ear. Makes everything sound like it is behind you.
Anyway, got any short cuts for finding a way into that part of the dash? My fuses are along the door post on the driver's side of the car.
I will probably try to find a YouTube video on it as well.
Thanks
Gus
Anyway, got any short cuts for finding a way into that part of the dash? My fuses are along the door post on the driver's side of the car.
I will probably try to find a YouTube video on it as well.
Thanks
Gus
#12
if your fuses are on the left side of the driver, you must have a 240, not a 740/940... on a 7/9, all the fuses are behind the ashtray, while on a 240, they are scattered all over.
on your 1987 240, its accessible by removing the glovebox, and its basically tucked in behind the center console air vents.
http://www.davebarton.com/pdf/relay_87_240.pdf <= relay location diagram.
the original OD relay looks something like this,
replacement:
https://www.fcpeuro.com/products/vol...60-780-3523804
on your 1987 240, its accessible by removing the glovebox, and its basically tucked in behind the center console air vents.
http://www.davebarton.com/pdf/relay_87_240.pdf <= relay location diagram.
the original OD relay looks something like this,
replacement:
https://www.fcpeuro.com/products/vol...60-780-3523804
#13
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08-29-2014 04:07 AM
240, 244, 740, affect, automatic, broken, functioning, overdrive, problem, soleniod, speedometor, stopped, transmission, volvo, working