Technical Multimeter readings how/to check

[mozart]

Greetings from greece ...
Many time i see some threads about checking car parts with multimeter..can everybody who knows write what we measure and what values we should see ?
Things to consider
Ht leads (we measure resistance what values are good to see ? ) coil ?
Crank sensor ? Blue valve temp sensor ?
Lamda sensor ? Any electric test ? We can check all these also from awscan 2 accurate from the test ?

 

[bugsymike]

Greetings from greece ...
Many time i see some threads about checking car parts with multimeter..can everybody who knows write what we measure and what values we should see ?
Things to consider
Ht leads (we measure resistance what values are good to see ? ) coil ?
Crank sensor ? Blue valve temp sensor ?
Lamda sensor ? Any electric test ? We can check all these also from awscan 2 accurate from the test ?

Regarding sensors they will have different acceptable readings/values so need to check recommendations.
Regarding HT leads with carbon string suppressed leads in effect the longer the lead the higher the resistance, however the main thing is to have a reading as no reading indicates a break inside the lead, this is not visible from outside inspection. In that circumstance what often happens is the engine will run , but misfire under load for instance up hill, but also in damp weather as the HT voltage (like water) will take the easiest route.
Many modern sensors etc. can only be checked with suitable diagnostic equipment or oscilloscopes, rather than multimeters.