askhost.blogg.se - Accurate 4-305 chevy starter

The very first thing you'll need to do is to verify if the crank sensor is producing a crank signal. The crankshaft position sensor is located on the bottom (passenger-side) of the engine timing chain cover. TEST 1: Testing The CKP Signal With A Multimeter Using the starter motor will make the multimeter average out these pulses and this type of test result is not as accurate.

In my crankshaft position sensor test instructions, I'll ask you to manually rotate the crankshaft pulley by hand because this is the only way that your multimeter will be able to see these ON/OFF voltage pulses. The most important thing to know about the crank sensor is that if it goes bad, your GM pickup or SUV will 'crank but not start' due to a lack of spark and fuel injection. The PCM uses these ON/OFF 5 Volt pulses to start activating the ignition control module and a host of other things to get your vehicle started.OFF is when that same tooth passes completely away from the crank sensor, which causes the sensor to drop the voltage down to 0 Volts.ON is when a tooth on the target wheel passes directly over the sensor, which induces the sensor to create and send a 5 Volt DC pulse.

As the ‘teeth’ on this target wheel pass by the crank sensor, they start to activate the sensor into creating an ON/OFF pulse.

A round ‘target wheel’ attached to the front of the crankshaft and positioned so that it rotates above and in close proximity to the crank sensor, starts to rotate.

When you turn the key and start cranking the engine the crank sensor gets 12 Volts on circuit A and Ground on circuit B.

Once the crank sensor produces this signal, the signal is an ON/OFF voltage signal (in DC Volts).īelow, in a nutshell, is how the crankshaft position sensor works in your 4.3L, 5.0L, and 5.7L Chevrolet or GMC (or Olds, Cadillac) pickup or SUV: The crankshaft position sensor, on your GM 4.3L, 5.0L, or 5.7L Vortec engine is a Hall Effect type sensor, which in plain English means that it needs a power and a Ground source to produce a signal.