Toyota Celica 2005 Repair Manual page 642

INSPECTION PROCEDURE
HINT:
Hand−held tester only:
To determine the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen
sensor or other trouble areas can be distinguished).
(a) Perform ACTIVE TEST using the hand−held tester (A/F CONTROL).
HINT:
"A/F CONTROL" is the ACTIVE TEST which changes the injection volume to −12.5 % or +25 %.
(1) Connect the hand−held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine by running it at 2,500 rpm for approximately 90 seconds.
(4) Select the menu "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL."
(5) Perform "A/F CONTROL" with the engine idling (press the right or left button).
RESULT:
Heated oxygen sensor reacts in accordance with increase and decrease of the injection volume
+25 % → rich output: More than 0.5 V
−12.5 % → lean output: Less than 0.4 V
NOTICE:
There is a delay of few seconds in the sensor 1 (front sensor) output, and there is approximately 20
seconds delay at maximum in the sensor 2 (rear sensor).
Output voltage of heated oxygen
sensor (sensor 1: front sensor)
Injection volume
+25 %
−12.5 %
Output voltage
Case 1
More than 0.5 V
Less than 0.4 V
Injection volume
+25 %
−12.5 %
Output voltage
Case 2
Almost
no reaction
Injection volume
+25 %
−12.5 %
Output voltage
Case 3
More than 0.5 V
Less than 0.4 V
Injection volume
+25 %
−12.5 %
Case 4
Output voltage
Almost
no reaction
2005 CELICA (RM1131U)
DIAGNOSTICS − ENGINE (2ZZ−GE)
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)
Injection volume
+25 %
−12.5 %
Output voltage
More than 0.5 V
OK
Less than 0.4 V
Injection volume
+25 %
−12.5 %
Output voltage
More than 0.5 V
NG
Less than 0.4 V
Injection volume
+25 %
−12.5 %
Output voltage
Almost
OK
no reaction
Injection volume
+25 %
−12.5 %
Output voltage
Almost
NG
no reaction
641
Mainly suspected
trouble area
⎯
OK
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
OK
Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
NG
Extremely rich or lean actual
air−fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
NG
etc.)
DI−443