Lambda Wiring

[Guest mcramsay]

hey just got a narrow band lambda sensor, its a 4 wire sensor meaning it has a heater installed. just wondering if the heater should be wired in through a relay which energises when the ignition is turned on, or if ican just simply come straight off a 12v switched supply?

[Andy Spencer]

Hi a narrow band lambda won't be any use for feedback for your rich running, if that's what you were hoping to use it for. The feedback loop is just too narrow for it to be effective. Mine has a narrow band one on and never use it. It does give you an outline indication at idle but that's about it.

Cheers

[TonySuperSpec]

hi

 

4 wire lambda will only be used once the ECU has started and the engine is running at temp.

 

there should be an ECU output to switch on lambda heater relay. You need a relay since the current sink on the ECU will not be up to the task.

 

The lambda signal wiring should be screened. The voltage swing from a Lambda isnormally no more than 0.5 volts Rich to Lean so any interference will make it wrong..