Drive 1 drive slot sensor drive fault detected. Distributor Pickups

There are many advantages to the Hall effect sensor.

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As the teeth move away, the flux springs back outward, inducing a voltage in the pickup coil. So for camshaft position sensing, a Hall sensor is typically better than a VR sensor, as it produces a full strength signal at low speeds, unlike a VR sensor. Because it generates a signal without requiring external power, it is very easy to implement.

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When you place the metal piece on the sensor the needle on the voltmeter will swing one way. Having the sensor tip wider than the teeth is definitely not good either, as the signal will be weak, subject to noise, and very likely unusable.

A magnetic crank position sensor should also produce an alternating current when the engine is cranked so a voltage output check can be performed.

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When a notch, pin, teeth or hole in a timing wheel the reluctor moves past the sensor, it causes a change in the magnetic flux field around the sensor. Its accuracy is unaffected even when covered in under hood muck. Instead of teeth on the wheel, as in a variable reluctor sensor, you must have small magnet and a shutter wheel.

The sensor wiring will affect the signal seen by the VR circuit, and hence the processor. This might happen if you try to squeeze a very small multi-tooth wheel inside a distributor, for example. Note that only one 'zero-crossing' is appropriate for triggering, this is the steep crossing at the tooth the drive 1 drive slot sensor drive fault detected zero-crossing is relatively flat, and so the timing of it is quite variable compared to the proper trigger.

Use the tachRef program. This confusion can be avoided by oscilloscope to observe both the input waveform to the circuit and the output of the circuit that goes to the processor. The wrong polarity will show up as either an extra tooth or erratic spacing of the teeth in the region around the missing tooth section.

The right triangle provides a slow up ramp, then the right angle side provides a very sharp vertical drop - which is what you want to minimize the crossing location error. Note also that best bet is to obtain an OEM matched wheel and sensor set whenever possible.

The sensor uses a magnetic pickup to produce a signal. This type of switching has not been used in ignition system by manufacturers for many years. With the sensor connected, the output voltage across the appropriate module terminals while cranking the engine should be at least 20 milliVolts mV on the AC scale of your meter.

Even then you have to figure out how this will come out when it goes through the VR circuit. Changing any one of these VR polarity, ignition input capture edge changes the actual trigger point, so the timing should be 're-calibrated'.

Sensor output can be checked by disconnecting the coil and cranking the engine to see if the sensor produces a voltage signal. In the s it became more common, mainly on Chrysler imports. Check the manual for your car for the specified voltage. Hall applied an current to a piece of metal inserted between two magnets, he found it created a secondary voltage in the metal at a right angle to the applied voltage.

The wrong edge may be so variable that MS-II considers the signal out of range, and rejects it altogether. It has been used by virtually every auto manufacturer for many years and is still widely used. Variable reluctor sensors are cheap and very rugged, Hall effect sensors are much smaller, more expensive, and nearly as rugged.

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The square wave it produces is particularly suitable for use in digital electronic systems. A variable reluctor magnetic sensor typically has two wires, and possibly a shield wire. There are two zero-crossings per tooth - a steep crossing occurs when a tooth passes, the other 'shallow' crossing occurs between teeth. Most modern electronic ignitions use one of three types of sensors in the distributor or crank position sensor.

The Hall effect sensor consists of three parts: When a magnet is placed in proximity to the wafer, the current tends to bunch up on one side of the silicon. The principle was discovered in If you swap the wires from the sensor so the one previously used as the trigger is grounded, and the other - that was grounded - is used as the signal for the VR circuit then the trigger point will now be the negative-going zero crossing, and the setting in MegaTune should be changed to 'rising edge'.

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In these cases the distributor also mechanically adjusted the timing, though MegaSquirt-II could be used with a points type distributor by locking the mechanical and vacuum advance mechanisms. When a window vane of the shutter wheel is in line with the Hall element and the magnet, the magnetic field expands to reach the element and no voltage is produced.

If the trigger is properly set up on the 'falling edge' in MegaTune, this means the the trigger is the positive-going zero crossing from the sensor.

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Hall effect crankshaft position sensors typically have three terminals: Don't just grab a Ford sensor and a Honda wheel and expect them to work with each other. A Hall Effect Sensor may be normally 'high' or normally 'low', depending on how it is designed. Then check with a timing light, and if things are not right i. The Hall sensor has electronic circuitry that provides a constant voltage pulse regardless of the speed.

Some crank position sensors also use Hall sensors. A tooth that is too long will 'spread out' the zero crossing, making the zero-crossing unpredictable, causing timing 'jitter'. The correct width will help provide a sharp zero-crossing transition, making the timing predictable. Here are three ways: The pulse produced is as long as there is a magnetic field of some strength present, and is always of the same polarity positive with respect to ground.

This type of sensor produces an alternating current AC wave output. On an oscilloscope, you should see a square wave form: This induced current has reversed direction as the magnetic field returns to normal. When there is metal between the Hall element and the magnet, the magnetic field is blocked from reaching the element and a voltage is produced. Older engines might use mechanical contact points.

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You can use the LED tester to check the signal. Kettering Triggers points The Kettering 'points' type of ignition used a drive 1 drive slot sensor drive fault detected as a mechanical switch to turn the primary circuit on and off. You do this with a 5 or 12 Volt source MegaSquirt will work with either voltage, check your sensor specs to see which it expects.

A small magnet is attached to the other end, and this assembly is mounted in the distributor facing the distributor shaft. The VR sensor output voltage output is highly dependent on the proximity of the tooth. Hall-Effect triggering has been widely used on European vehicles with Bosch electronics since the late s.

Then you want to select the polarity of the edge going to the ECU to be that which lines up with the 'most vertical' zero crossing on the VR input side. Easiest Go ahead and set the delay tooth, trigger edge and trigger offset under the assumption that the zero crossing trigger will occur when the centers of the sensor and tooth are aligned and this will be what the ECU sees.

The Hall effect sensor consists of semiconductor material which will conduct current when the material is subject to a magnetic field. When a there is a 'slot' between the LED and photo cell, light passes through the slot and falls on the photo cell, causing the photo cell to produce a voltage.

If the wheel won't fit, by all means make your own wheel, but with the exact same tooth type, so you know it will be matched to the sensor. The most important consideration for a VR sensor is that the tooth width not the wheel thickness, but the length of the top of tooth in the direction of travel should be matched to the sensor tip width not the overall all width of the sensor, just the sensing element which is usually visible at the end.

In the sensors we are concerned with, the Hall effect is used to change of resistance in a semiconductor in a magnetic field, and this is then used to switch an output voltage from high to low, or vice versa. In some cases, the Hall sensor doesn't produce a voltage signal, instead it pulls a voltage low.

It is based on the Hall effect. The best bet is to use the sensor gap recommended by the manufacturer, and if that is not available, you may have to experiment. The result is that the points produce an approximately square wave signal on the point connected to the coil negative terminalwith an 'amplitude' of 12 volts when they are openpulled to ground when they close charging.

Hall element, which has a small current flowing through it, Magnet, Metal shutter wheel, which has small evenly-spaced windows. North pole will turn it on, South will not, or vice-versa, depending on the orientation of the sensor. A core of steel is wrapped with hundreds of turns of fine wire at one end.

The direction of rotation doesn't matter to the VR polarity i. Best Set it up on the bench the way you want to set it up on the car and scope the output. The sensor must have voltage and ground to produce a signal, so check these terminals first with an analog voltmeter if you suspect it is not working.

However, if you change both - you should be where you started whether that was right or wrong!

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