DTC DETECTION LOGIC

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately low.

DTC No.
Trouble diagnosis name
DTC detecting condition
Possible Cause
P0131
Air fuel ratio (A/F) sensor 1 (bank 1) circuit low voltage
  • The A/F signal computed by ECM from the A/F sensor 1 signal is constantly approx. 0V.
  • Harness or connectors
    (The A/F sensor 1 circuit is open or shorted.)
  • A/F sensor 1
P0151
Air fuel ratio (A/F) sensor 1 (bank 2) circuit low voltage

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.CHECK A/F SENSOR FUNCTION
 
 3.PERFORM DTC CONFIRMATION PROCEDURE