Toyota Celica 2005 Repair Manual page 697

DI−498
3 Perform A/F CONTROL active test.
(a) Connect the hand−held tester to the DLC3.
(b) Run the engine at 2500 rpm for 90 seconds.
(c) Allow the engine to idle.
(d) Select from the tester menus: DIAGNOSIS / ENHANCED OBDII / ACTIVE TEST / A/F CONTROL.
(e) Switch the injection volume between +25% and −12.5%, and then check the oxygen sensor voltages.
Result
Heated oxygen sensor
Go to
(Bank 1 Sensor 1)
Injection volume
+25 %
−12.5%
Output voltage
A
More than 0.55 V
Less than 0.4 V
Injection volume
+25 %
−12.5%
Output voltage
B
Almost no reaction
Injection volume
+25 %
−12.5%
Output voltage
C
More than 0.55 V
Less than 0.4 V
Injection volume
+25 %
−12.5%
D
Output voltage
Almost no reaction
NOTICE:
The front heated oxygen sensor has an output delay of a few seconds.
The rear heated oxygen sensor has a maximum output delay of approximately 20 seconds.
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (2ZZ−GE)
Heated oxygen sensor
(Bank 1 Sensor 2)
Injection volume
+25 %
−12.5%
Output voltage
More than 0.5 V
Less than 0.4 V
Injection volume
+25 %
−12.5%
Output voltage
More than 0.5 V
Less than 0.4 V
Injection volume
+25 %
−12.5%
Output voltage
Almost no reaction
Injection volume
+25 %
−12.5%
Output voltage
Almost no reaction
696
Suspected Trouble Area
Catalysts
Heated oxygen sensor
(Bank 1 Sensor 1)
Heated oxygen sensor
(Bank 1 Sensor 2)
Extremely rich or lean fuel−trim,
etc.