Note: Before enabling Narrowband O2 simulation, the ECU's wideband-sensor input pin must be configured. Clicking Edit Wideband input pin assignment... takes you to the pin-configuration dialog where you can modify the Wideband (WB) pin assignment.
Enable narrowband simulation causes the ECU to produce and use a narrowband oxygen sensor signal based on a wideband oxygen sensor unit's signal. The simulated signal is a square wave indicating either richer or leaner than the Wideband switch point.
Wideband switch point defines the wideband sensor's output voltage around which the ECU will cycle the air/fuel mixture during closed-loop fuel control. Normally this will be the voltage that the wideband sensor uses to represent a stoichiometric mixture (14.7:1 air/fuel ratio for gasoline).
To determine the appropriate switch point for normal operation, look at the wideband unit's documantation to find the wideband unit's output voltage that represents a 14.7:1 gasoline air/fuel ratio (lambda = 1.0). Otherwise, log the wideband unit's output as a raw value (volts) while operating the engine with a true narrowband sensor installed and narrowband simulation disabled, then take an average of the voltage readings while the engine is operating in normal closed-loop mode (a constantly cycling FrontO2 voltage reading).
You can also refer to our online wiki page which has a collection of suggested starting points for various WB kits.
For the purposes of narrowband simulation, the following startup options cause the ECU to ignore the wideband signal until it is valid.
Delay for specifies the number of seconds for the ECU to wait following engine start before the ECU begins looking at the wideband voltage. Prior to the expiration of this timer, the narrowband simulation produces a lean indication (simulating a cold narrowband sensor).
Wideband units typically produce a high (lean) , low (rich) or stoichiometric indication until they warm up sufficiently to be operational. and until WB not equal to specifies a voltage range that the output of the wideband unit must leave before the ECU begins interpreting the wideband voltage. Prior to leaving this voltage range, the narrowband simulation produces a lean indication (simulating a cold narrowband sensor).
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