DTC DETECTION LOGIC

To judge the malfunction of A/F sensor 1, this diagnosis measures response time of the A/F signal computed by ECM from the A/F sensor 1 signal. The time is compensated by engine operating (speed and load), fuel feedback control constant, and the A/F sensor 1 temperature index. Judgment is based on whether the compensated time (the A/F signal cycling time index) is inordinately long or not.

DTC No.
Trouble diagnosis name
DTC detecting condition
Possible Cause
P0133
Air fuel ratio (A/F) sensor 1 (bank 1) circuit slow response
  • The response of the A/F signal computed by ECM from A/F sensor 1 signal takes more than the specified time.
  • Harness or connectors
    (The A/F sensor 1 circuit is open or shorted.)
  • A/F sensor 1
  • A/F sensor 1 heater
  • Fuel pressure
  • Fuel injector
  • Intake air leaks
  • Exhaust gas leaks
  • PCV
  • Mass air flow sensor
P0153
Air fuel ratio (A/F) sensor 1 (bank 2) circuit slow response

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE-I
 
 3.PERFORM DTC CONFIRMATION PROCEDURE-II
 
 4.PERFORM DTC CONFIRMATION PROCEDURE-II
 
 5.CHECK AIR-FUEL RATIO SELF-LEARNING VALUE
 
 6.DETECT MALFUNCTIONING PART
 
 7.PERFORM DTC CONFIRMATION PROCEDURE