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DI-359
DIAGNOSTICS - ENGINE (1GR-FE)
DIDUB-01
DTC P2A00 A/F Sensor Circuit Slow Response (Bank 1
Sensor 1)
DTC P2A03 A/F Sensor Circuit Slow Response (Bank 2
Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page DI-312.
DTC No. DTC Detection Conditions Trouble Areas
S Open or short in A/F sensor (sensor 1) circuit
P2A00 Calculated test value for A/F sensor response rate deteriora-
S A/F sensor (sensor 1)
P2A03 tion level is less than threshold.
S ECM
MONITOR DESCRIPTION
After engine is warmed up, the ECM performs air-fuel ratio feedback control to regulate the air-fuel ratio
at stoichiomentric ratio. In addition, this vehicle performs Active A/F Ratio Control for approximately 10 se-
conds after preconditions met in order to measure the A/F sensor response rate. During active air-fuel ratio
control, the ECM forcibly increases and decreases the injection volume for certain amount based on learned
stoichiomentric air -fuel ratio during usual air-fuel feedback control, and measures the A/F sensor response
rate. The ECM calculates the signal from the A/F sensor while value for A/F sensor response rate deteriora-
tion level.
If the test value for A/F sensor response rate deterioration level is less than threshold, ECM interprets this
as a malfunction, and sets the DTC.
Air-fuel Ratio Sensor Output:
10 Seconds
ON
Active A/F Control OFF
Malfunction
Normal
A/F Sensor Output
Fuel Injection Volume
A23458
DI-360
DIAGNOSTICS - ENGINE (1GR-FE)
CONFIRMATION DRIVING PATTERN
Vehicle speed
25 - 75 mph) (h)
(40 -120 km/h)
(g)
Warm up 3 minutes
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the hand-held tester ON.
(d) Clear DTCs.
(e) Select the following menu items: DIAGNOSIS/ENHANCED OBD II/MONITOR INFO/MONITOR RE-
SULT.
(f) Check that RES RATE B1 S1 is INCOMPL.
(g) Start the engine and warm it up.
(h) Drive the vehicle at between 25 mph and 75 mph (40 km/h and 120km/h) for 3 minutes. However, the
vehicle should be driven at constant-speed.
(i) When detection is complete, Response rate of MONITOR RESULT changes.
If the value does not change, perform step (h) once more.
(j) Notes the value of the Monitor Result.
(k) Select the following menu items: DIAGNOSIS/ENHANCED OBD II/DTC INFO/ PENDING CODES.
(l) Check if any DTCs (any pending DTCs) are set.
MONITOR STRATEGY
P2A00 A/F sensor (Bank 1) slow response
Related DTCs
R l t d DTC
P2A03 A/F sensor (Bank 2) slow response
Required sensors/components A/F sensor
Frequency of operation Once per driving cycle
Duration 10 to 15 sec.
MIL operation 2 driving cycles
Sequence of operation None
DI-361
DIAGNOSTICS - ENGINE (1GR-FE)
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever these
See page DI-18
DTCs are not present
Active A/F control is performed when the
-
following conditions are set
Battery voltage 11 V -
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