Overdrive (assuming it's manual) is controlled by a solenoid mounted on the overdrive unit (type P) itself. On the M46 transmission, it is mounted on the lower left side. That solenoid is controlled by a relay in the electrical console, behind the ashtray. These solenoids are a known problem with the M46 and many owners install an 'overdrive delete' cover in its place.
If you have an automatic, there is a relay in a similar position controlling a similar solenoid.
On either transmission, trace the wires from the transmission case to the interior and verify that they are not chafed or rubbing the body ground points.
What is a overdrive delete cover? Does this mean the overdrive does not work? Why not buy a new overdrive solenoid?I have the 5 speed manual transmission.
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SOURCE: 4th gear locked out on 1990 740 volvo wagon
Sounds like your overdrive solenoid is dirty or broken. Take off the solenoid and clean it really well, put it back on and see if it works. If not you will have to replace it.
This happened to my fathers and I had to clean it.
Sometimes the tranny oil is so dirty that little bits of metal get stuck in the solenoid area and you have to scrape them off. You might want to do a tranny flush if it's bad.
SOURCE: fuse box for volvo 740
I have a 1987 740 & the fuse box is located behind the ash tray in the center console. After removing the ash tray you can access the fuse box. Each fuse description, size, & location are listed on the back of the ash tray.
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