Question about 1995 Nissan Pickup

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Could a bad speed sensor cause my 1995 4 cyl. nissan pick up to go into limp mode, what code is a bad speed sensor, where are the computers in the '95's, and how could I flash the codes out of this vehicle? Could I probe it like the obd-1 hondas or do I need a flash tool to plug in somewhere on this vehicle in order to flash the codes like the obd-1 gm's?

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I have researched this for some time and found the following: A faulty speed sensor causes the following symptoms - delayed acceleration, a hopping sensation, bad gas mileage, speedometer on and off, (limp mode is a misnomer on this particular model), yes it goes into a "limp" mode but what is happening is that it is circumventing the system into another operational mode, not the true "limp home" mode. It won't go uphill over 40 miles per hour and it is verified by removing the seat and checking the box and the flashes of light to count to determine the code. After fixing the first code, it will give you a secondary code. Don't turn the box off or reset it or you will have to start all over again. Sometimes the sensors can be cleaned. The primary cause is condensation in the sensor and heat. If it is heat, there is probably a problem which is more serious to be addressed. Take the sensor apart, probe with a cleaning implement and spray with electronic cleaner. Someone said spray with WD40 but I wouldn't recommend that - something tells me that it could cause the electronics to meld and that is in opposition to the objective. I hope I said this all correctly. I have a Haynes manual and additionally have read every blog I could find. Some were just plain silly and if you want to spend the $160 - 260 bucks, go ahead. Don't forget that some mechanics will simply clean your sensor and still charge you. You will have a speedometer but the computer will be telling the truck to cut back on the levels of fuel/air. If you know about computers, when you get the "blue screen of death" and reboot, your computer will ask you if you want to go to the "best last known configuration" and that is exactly what the computer in the 1995 Nissan pickup is doing. Then when you get the speedometer working again, there is always another sensor in the "next" position on the module. So, what if the oxygen sensor actually malfunctioned first and that caused the speed sensor to fail. The code for the speed sensor would come up first then the code for the oxygen when in actuality, it was the oxygen sensor that caused the problem in the first place and that is a $35 fix. There is also another sensor called the "knock" sensor. I found in my Nissan there is sometimes a knocking and tapping which does sound like a tappit but isn't. If you will consider all things such as have you recently washed the engine compartment, driven through water puddles, etc., the seasonal temperature, if it had a cooling problem and overheated, etc., this all has to be taken into consideration. If anyone can add to this I, too, will appreciate more info too. I am just a little gray-haired old lady waiting for the sun to go down and I'm going to take the seat out and count the flashing light to get the code. Then I'm climbing under it and cleaning the speed sensor. I just bought the truck, just washed the engine and just sprayed each sensor and clip with electronic cleaner. I should have taken them apart and cleaned each one weeks ago and didn't. The mechanic wants $60 an hour labor, $95 diagnostic, $250 speed sensor, $50 oxygen sensor then what else? Oh, they need the payment for their "alignment machine" paid for this month. HaHa - smiles 4 miles. . .

Posted on May 13, 2011


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Because you replaced the speed sensor and are still experiencing the problem, we suspect that you have a faulty speedometer cluster.
Please check this link and go through the article to have an indepth knowledge to your problem....
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