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Car Forum / Honda Cars / February 200891 Prelude Electrical Issue
My daughter is reporting some strange electrical behavior with her 91 Honda Prelude. Sometimes when she does one thing electrical, then it affects other electrical things as well. For example, when she lowers the window or turns on the wipers, then the radio is affected and lights dim. Today when she pressed on the brakes, the car died (she only was slowing down some). She has had no trouble starting the car and the voltage at the battery is over 12v (I can't remember what I saw when I tested it) when no load and not charging, and 14.2v when the engine is running. The battery was bought last July, and the alternator was replace last summer too. I could not find any wires that were grounding out in the engine area. The fuse box under the hood did not show any signs of moisture or arcing. I'm not sure where to look next to solve the problem. Could it be an electrical relay. Any ideas might help. Thanks Jerry You might look around for ground points and clean the connections, starting on and around the engine, and then the interior. A factory electrical troubleshooting manual shows all the ground points. The manuals can be found cheap on ebay. Just a thought. dan > Any ideas might help. > > Thanks > > Jerry > You might look around for ground points and clean the connections, > starting on and around the engine, and then the interior. A factory > electrical troubleshooting manual shows all the ground points. The > manuals can be found cheap on ebay. That makes sense. I have already purchased the manuals online last summer so I'll check all the grounds next. > Just a thought. Thanks > dan Jerry > My daughter is reporting some strange electrical behavior with her 91 > Honda Prelude. [quoted text clipped - 21 lines] > > Jerry Let the engine running at idle. If the idle speed drops under electrical loads, then the throttle angle sensor (aka throttle position sensor or TPS) might be out of adjustment >> My daughter is reporting some strange electrical behavior with her 91 >> Honda Prelude. [quoted text clipped - 25 lines] > electrical loads, then the throttle angle sensor (aka throttle > position sensor or TPS) might be out of adjustment rubbish!!! never touch the tps - it's set at factory and never needs adjusting. > bi...@scn.org wrote: > >> My daughter is reporting some strange electrical behavior with her 91 [quoted text clipped - 29 lines] > rubbish!!! never touch the tps - it's set at factory and never needs > adjusting. Either way, I don't see this behavior anyway. I did find that one ground was only held on by a partially stripped nut on top of the engine, near the alternator (that was replaced by a local repair shop last summer), I tightened it with a new nut.It might have been the issue since it was slightly tighter than finger tight. I also cleaned up the connection if a wire brush. I don't know if this fixes it or not yet because I never experienced the problem, only my daughter has. I drove it for about 20 minutes after that, playing with all the electrical devices I could and it worked fine. Nothing got dimmer or reacted like it had any problem when something else electrical was being adjusted or operated. It might be fixed now or it might not be fixed. Only time will tell. Jerry > > bi...@scn.org wrote: > > >> My daughter is reporting some strange electrical behavior with her 91 [quoted text clipped - 31 lines] > > Either way, I don't see this behavior anyway. Then you can check for ground connections. When the engine is not running, measure the voltage between the battery terminals and compare it with the measurements you get from the (+) terminal to the valve cover (+) terminal to the engine block (+) terminal to the transmission housing (+) terminal to chassis voltage drops should be no more than 0.05 - 0.1 volt > I did find that one ground was only held on by a partially stripped > nut on top of the engine, near the alternator (that was replaced > by a local repair shop last summer), I tightened it with a new > nut.It might have been the issue since it was slightly tighter > than finger tight. I also cleaned up the connection if a wire > brush. make sure you check and tighten the nuts on the alternator terminals too!!! > I don't know if this fixes it or not yet because I never experienced > the problem, only my daughter has. I drove it for about 20 minutes [quoted text clipped - 5 lines] > > Jerry Was the rear defogger on when she experienced the problems? the defogger typically draws 25A !! Still, i don't see how the engine dies when the brake is applied, if the TPS is good, i would suspect vacumm leaks or other causes of mechanical malfunctions >>> bi...@scn.org wrote: >>>>> My daughter is reporting some strange electrical behavior with her 91 [quoted text clipped - 60 lines] > Still, i don't see how the engine dies when the brake is applied, if > the TPS is good, that's because its not the tps!!! apart from anything else, tps gives you code. > i would suspect vacumm leaks that's more like it. > or other causes of > mechanical malfunctions welcome to psychic car care 101. > bi...@scn.org wrote: > [quoted text clipped - 65 lines] > that's because its not the tps!!! apart from anything else, tps gives > you code. Except for the signal it receives from the TPS, the ECU has absolutely no other reference to the position of the throttle plate. The signal from the TPS is in form of electric voltage, and falls into a certain range (corresponding to the throttle positions at idle and WOT) The ECU only throws a code when the voltage it receives is out out range, and then defaults the throttle to a certain position. Your car will start, but will not be drivable as the gas pedal will not work. Note that the ECU is completely blind to how you calibrate the TPS to the physical postion of the throttle plate. The links you sent regarding the codes for TPS doesn't work. But thanks for the turkey dog treat recipes. My dog loves it!! Cheers > > i would suspect vacumm leaks > [quoted text clipped - 4 lines] > > welcome to psychic car care 101. >> bi...@scn.org wrote: >>>>> bi...@scn.org wrote: [quoted text clipped - 57 lines] > Except for the signal it receives from the TPS, the ECU has absolutely > no other reference to the position of the throttle plate. correct. > The signal from the TPS is in form of electric voltage, and falls into > a certain range (corresponding to the throttle positions at idle and > WOT) The ECU only throws a code when the voltage it receives is out > out range, it doesn't know enough to understand "out of range" - all it checks for is whether there's any connection. three leads - one at each end of the carbon track and one for the brush - just like a potentiometer. if the track is broken, code. if the brush is worn and doesn't contact, as happens at high mileage where a spot wears on the track, code. > and then defaults the throttle to a certain position. the throttle position is entirely mechanical, so no change in actual throttle position. as for assumptions, if it doesn't get tps signal, injection stops. > Your > car will start, but will not be drivable as the gas pedal will not > work. that's not my experience - it cuts completely. > Note that the ECU is completely blind to how you calibrate the > TPS to the physical postion of the throttle plate. you are not supposed to touch the calibration. period. the eacv exists entirely to remove the need to ever go near tps calibration. that's why it's shear-bolted into position - so as to be non-adjustable. you can of course adjust the throttle plate's idle position, but the throttle plate and the tps remain synced and in calibration. > The links you sent regarding the codes for TPS doesn't work. But > thanks for the turkey dog treat recipes. My dog loves it!! [quoted text clipped - 7 lines] >>> mechanical malfunctions >> welcome to psychic car care 101. > bi...@scn.org wrote: > >> My daughter is reporting some strange electrical behavior with her 91 [quoted text clipped - 29 lines] > rubbish!!! never touch the tps - it's set at factory and never needs > adjusting. oh my bad!! the sensor is made of magnesium alloy and it's welded to the throttle body!! muahahhaha... |
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