Toyota 2GR-FE Manual page 545

Element
A
Exhaust Gas
DTC No.
P2A00 Calculated value for air-fuel ratio (A/F) sensor response
P2A03 rate deterioration level is less than threshold
MONITOR DESCRIPTION
After the engine is warmed up, the ECM performs air-fuel ratio feedback control to maintain the air-fuel
ratio at the stoichiometric level. In addition, active A/F ratio control is performed for approximately 10
seconds after preconditions are met in order to measure the A/F sensor response rate. During active A/F
ratio control, the ECM forcibly increases and decreases the injection volume by a certain amount, based
on the stoichiometric air-fuel ratio learned during normal air-fuel ratio control, and measures the A/F
sensor response rate. The ECM receives a signal from the A/F sensor while performing active A/F ratio
control and uses it to calculate the A/F sensor response rate deterioration level.
If the value for A/F sensor response rate deterioration level is less than the threshold, the ECM interprets
this as a malfunction and sets the DTC.
2GR-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
Solid electrolyte
(Zirconia Element)
Cover Platinum electrode
Air
A
A-A Section
DTC Detection Conditions
Output Voltage
Heater
• Open or short in A/F sensor circuit
• A/F sensor
• ECM
ES–389
Ideal Air-Fuel Mixture
Rich - Air Fuel Ratio - Lean
A107164E13
Trouble Area
ES