Quote:
Originally Posted by AndrewCologne
…lets the signal provide less voltage to the ECU, and the signal’s amplitude will be lower. The ECU interprets this as a too lean mixture even if it's ok and increases the duty cycle.
It’s ok for testing purposes, but it still compensates for a fault on the CIS side, so the real solution is to fix the existing problem.
|
The basic problem is the range of the fuel mixture change, based on the O2 input (pin 2 of Lambda ECU) change being too large, resulting in an excessive fuel control pressure change.
This is what causes the engine surging. An incorrect warm control pressure WUR setting can cause this, or the Lambda ECU's closed loop feedback gain.