An oscilloscope is a powerful diagnostic tool allowing a direct connection to sensors out put going way beyond what live data from a scan tool is capable of telling you
Basically an oscilloscope is a graphing volt meter,or volts over time.
Voltage readings and time in numerical form are not easy to interpret the other dimension that an oscilloscope gives is frequency.
I change per second is 1 hertz and then on up to giga hertz .
Voltage changes from an engines sensors alter over a time period of milliseconds that a digital voltmeter stands no chance of displaying
the ecu is knackered a common replace it to see if its broken ploy from a typical garage.
ecus are expensive and replacing one lightly will just leave you skint with the same problem.
ecus do fail but it isnt very common,certain vauxhauls had the ecu strapped to theeengine where heat and vibration quickly damaged it so in this case yes an ecu should be replaced but not automatically
A sure sign of your engine having problems is the classic rotten egg smell from your exhaust this is a very good sign of a failing lambda sensor or other problems causing the catalytic converter not to function properly
we cater for all of south Yorkshire but specialize in engine diagnostics Sheffield
lunar use the evidence driven approach to fault diagnostics never the substitution method that just leads the diagnostic procedure to a dead end.
gather data then apply a theory at last attempt but with the notion of throwing the idea out if further information throws doubt on it
A dirty throttle body can and will produce a p1555 code or in other words the tps is reporting a certain throttle position and due to carbon the maf isn't getting the air it expects.
The zafira uses fly by wire accelerator control so this gets a little messy.
In certain instances p1550 crops up up this situation is really bad
here we have a vauxhaull zafira with a main code of po170 and two pending codes p1555 is going to be a dirty throttle body.
Po130 well the 02 sensor is new so its going to be faulty wiring to the ECU
we have two crt scopes when is semi digital
these two beauties are used for sensor checks along with our dso scope which uses a laptop for its processing and screen
correct fuel pressure with an injection engine is vital.
The most usual direction for pressure to go is down if say your fuel pump is suspect or your fuel filter is blocked.
Low delivery rate can affect your cars power output mark ably
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Lunar auto diagnostics