Mode II (Mixture Ratio Feedback Control Monitor)

DIAGNOSTIC TEST MODE 2 (Mixture ratio feedback control monitor)
This mode checks, through the ECM LED, optimum control of the mixture ratio. The operation of the LED, as shown in the image, differs with the control conditions of the mixture ratio (for example, richer or leaner mixture ratios, etc., which are controlled by the ECM).




*: Maintains conditions just before switching to open loop

If the red LED remains ON or OFF during the closed loop operation, the mixture ratio may not be controlled properly. Check the related components or adjust the mixture ratio.