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When you depress the throttle, the throttle sensor electronically tells the computer to take the transmission out of overdrive and when the throttle is released overdrive comes back on. When you depress the brake pedal, it also will go out of overdrive by a switch connected to the brake pedal with the brake light switch. Let off the brake pedal and goes back into overdrive once at speed.
There are a couple of things to check on the M-46 with Type P overdrive (I think yours is a type P and not a type J):
1) Check the electrical connections from the switch on the top of the gearshift knob to the solenoid in the transmission with a VOM. Switch depressed - 12 VDC. Switch not depressed - 0 VDC. If OK - you are getting power to the solenoid that activates the overdrive.
2) Test the solenoid. Either use the switch on the top of the gearshift or use a local power source (12 VDC) wired to the solenoid. Listen for a light click. If you do not hear a click; the solenoid is probably defective. Test with a known good unit.
3) If the solenoid is working (and you are sure it is working) then check the oil level of the overdrive unit. These units use Dexron II/III (check your manual for the correct oil type) and ensure the oil level is correct.
4) These overdrive units are a lot like conventional automatic transmissions and are constructed as such. Consequently, the home mechanic should confine troubleshooting to the solenoid and correct oil level. The Type P units are slightly more durable than the earlier type J units but in either instance rely on fairly rigorous maintenance.
run fault codes for a problem in the transmission. Look for an od sensor/servo that is not working. Have a pressure test done on the gear box to check for internal faults/band and clutch adjustments.
It's stalling at lights because of no brake lights. Meaning the brake light switch and transmission power to shut off the overdrive is not working. Any time you touch the brake, overdrive is turned off because power to trans is stopped when brake lights come on. Both these operations are performed by the same switch under the dash and mounted so that when the brake pedal is depressed, the switch button comes out and turns on the brake lights in turn shutting down the overdrive. Adjust or replace that brake light switch and you're good to go.
Check the Fuse for the OD function, this is cab fuse panel fuse #29, 5A. If This fuse is blown, chances are the wires at the end of the shift lever are chaffed and causing the problem. This happens some times ( can't say why ), but it is simple enough to check and repair the wires if the insulation is chaffed.
Does the 3rd brake lamp illuminate? If so then your problem is multifunction switch.If it doesn't do the following checks.
Check for power to and thru the brake lamp switch itself.If you do not have power to the switch check fuse no. 10(20 amp) in the interior fuse panel.If you have power to the switch then depress brake pedal and make sure you have power thru the switch.If this is ok the check Fuse 22(20amp) with brake applied..
There isn't anything wrong with your car. This is perfectly normal. I have a 2000 ES300 as well as other people that I know and it operates in the same way. Overdrive doesn't mean the same thing for every car or transmission. In our case overdrive is simply a reference to the top gear which is 4th gear. When you switch overdrive off(which is depressing the button causing the O/D OFF dash light to illuminate,) the highest gear becomes 3rd because you turned 4th gear or overdrive off. The application scenario for this is usually mountainous terrain where a lot of uphill driving makes it more feasible not to up shift into 4th gear while ascending and descending. It will not switch back to overdrive or 4th gear until you re-engage it by turning the overdrive back on or repressing the button. Again, when the O/D OFF dash light is illuminated, overdrive which is 4th gear is off and the highest gear will then become 3rd. It will never shift into 4th gear while this light is illuminated or overdrive is off. When you press the button and the O/D OFF dash light is NOT illuminated overdrive is on and therefore it will shift into 4th gear as usual. This applies to all 97-2001 ES300's and probably any other car you drive tat exhibits this same type of change when overdrive is turned off.
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