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Car Forum / Driving, Maintenance, Tuning / Maintenance and Repair / October 20061996 v6 Corsica Question
Hi, I am unable to locate the oil pressure sending switch on this car. > Hi, > > I am unable to locate the oil pressure sending switch on this car. Look under the front exaust manifold and above the starter area for a one-wire switch with a large hex-shaped housing. Toyota MDT in MO > Look under the front exaust manifold and above the starter area for a > one-wire switch with a large hex-shaped housing. > > Toyota MDT in MO I see a one wire switch where you say, but if i unplug it, the fuel pump still engages? > > Look under the front exaust manifold and above the starter area for a > > one-wire switch with a large hex-shaped housing. [quoted text clipped - 3 lines] > I see a one wire switch where you say, but if i unplug it, the fuel > pump still engages? Why are you concerned about this? The oil pressure sender / fuel pump switch assembly isn't meant to keep the pump from operating. If you let the group know what your actual concern is we could address it more precisely. I thought you just wanted to know where the OP sender was. Toyota MDT in MO If you > let the group know what your actual concern is we could address it more > precisely. I thought you just wanted to know where the OP sender was. Yes, I want to know where the OP sender was. To check if I found it, I unplugged it, thinking the fuel pump would not engage. I guess that's not the case. I was told that the OP sender disabled the fuel pump in case of an accident so that if you wrecked the car, the fuel pump wouldn't keep spewing gas all over the road. > If you > [quoted text clipped - 8 lines] > accident so that if you wrecked the car, the fuel pump wouldn't keep > spewing gas all over the road. I don't think carmakers have used the oil pressure switch for that purpose for many years. Since the switch to full computer control of the engine, its much quicker and more fool-proof to shut down the fuel pump when the ECM stops seeing crank sensor pulses. > Yes, I want to know where the OP sender was. To check if I found it, I > unplugged it, thinking the fuel pump would not engage. I guess that's > not the case. I see. > I was told that the OP sender disabled the fuel pump in case of an > accident so that if you wrecked the car, the fuel pump wouldn't keep > spewing gas all over the road. GM has held on to this dual purpose OP sender design for decades now. I guess they are concerned the fuel pump relay will fail, and the cost to incorporate the sender/switch as a failsafe is virtually nil. It is not a safety shutoff measure, rather a FP relay failure measure. Toyota MDT in MO http://tinyurl.com/yy4rjc One is located as stated above, next to oil filter, but there is an optional sender [I nc about this] located elsewhere, so I linked the above for ya to figure it out.  SignatureKnifeblade_03 http://www.automotiveforums.com |
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