P2423

P2423 HC ADSORPTION CATALYST FUNCTION

DTC Logic

DTC Detection Logic




The ECM monitors the phase gap between heated oxygen sensor 2 signal and heated oxygen sensor 3 signal.

The phase gap between heated oxygen sensor 2 signal and heated oxygen sensor 3 signal becomes small as the HC adsorption catalyst (under floor) is deteriorated.

When the phase gap between heated oxygen sensor 2 signal and heated oxygen sensor 3 signal approaches a specified limit value, the HC adsorption catalyst (under floor) malfunction is diagnosed.







DTC Confirmation Procedure

Step 1-2:

Step 2 (Continued):

Diagnostic Procedure

Step 1-5:

Step 5 (Continued)-7:

Step 7 (Continued)-11: