Discussion
I've finally managed to get my tuscan talking to the laptop so quickly checked things out and lambda 456 is showing a constant 0 volts. It also shows as ok. With the car running the adaptive are well into the 30.
123 flicks between 0 and 1 volts generally around 0.8 and the adaptive around -2 to -4. Only had it running briefly so was cold but does that indicate lambda 456 is dead?
123 flicks between 0 and 1 volts generally around 0.8 and the adaptive around -2 to -4. Only had it running briefly so was cold but does that indicate lambda 456 is dead?
This is taken from the diagnostics manual:
LAMBDA 1 & LAMBDA 2
Lambda 1&2 show the signals from the lambda sensors on each set of three cylinders.
Lambda1 is the front three cylinders (ie. cylinders 1,2&3) and lambda 2 is the rear three
cylinders (ie. 4,5&6 ). After starting the sensors will take at least 30 seconds to warm up,
before they will read correctly . Once warmed up, the lambda signals should switch between
approx. 0 & 1-1.5 volts. 0 volts shows that the fuel mixture is lean, 1 volt shows that the
mixture is rich. The rate of switching will alter with engine speed, and the percentage of time
spent rich relative to lean will alter with engine load. If reading is a CONSTANT 0 V, check
sensor for proper connection, and sensor heater wires for continuity (6 ohms between white
red wires)
NOTE: Lambda sensors are supplied with 12V on the red wires ONLY WHEN THE FUEL
PUMP IS RUNNING, the WHITE wire is earth and BLACK the signal.
Can download it from here:
https://docs.google.com/file/d/0B4pzeL_TBDYeOGFmNG...
LAMBDA 1 & LAMBDA 2
Lambda 1&2 show the signals from the lambda sensors on each set of three cylinders.
Lambda1 is the front three cylinders (ie. cylinders 1,2&3) and lambda 2 is the rear three
cylinders (ie. 4,5&6 ). After starting the sensors will take at least 30 seconds to warm up,
before they will read correctly . Once warmed up, the lambda signals should switch between
approx. 0 & 1-1.5 volts. 0 volts shows that the fuel mixture is lean, 1 volt shows that the
mixture is rich. The rate of switching will alter with engine speed, and the percentage of time
spent rich relative to lean will alter with engine load. If reading is a CONSTANT 0 V, check
sensor for proper connection, and sensor heater wires for continuity (6 ohms between white
red wires)
NOTE: Lambda sensors are supplied with 12V on the red wires ONLY WHEN THE FUEL
PUMP IS RUNNING, the WHITE wire is earth and BLACK the signal.
Can download it from here:
https://docs.google.com/file/d/0B4pzeL_TBDYeOGFmNG...
It does sound like a knackered sensor.
A sign of health in a digital lambda sensor is the number of cross counts (i.e. the flicks between detecting lean and rich) a good sensor should do this at least once a second.
It sounds like your sensor has gone and is constantly sensing (lying) lean, pushing the adaptive map to it's highest level of positive adaption.
Have you reset the adaptives yet to see if you run smoother as a result?
A sign of health in a digital lambda sensor is the number of cross counts (i.e. the flicks between detecting lean and rich) a good sensor should do this at least once a second.
It sounds like your sensor has gone and is constantly sensing (lying) lean, pushing the adaptive map to it's highest level of positive adaption.
Have you reset the adaptives yet to see if you run smoother as a result?
http://www.nobleforums.com/showthread.php?10587-Ad...
Quite a good general discussion on MBE adaptive mapping.
Quite a good general discussion on MBE adaptive mapping.
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