Toyota Celica 2005 Repair Manual page 623

DI−424
2. Sum of cycle time data
3. Number of cycle time data summation
4. Sum of cycle time data
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria
Slow slope condition:
Time that output voltage of front heated oxygen sensor in-
crease. from 0.35 V to 0.45 V and that it decreases from
0.45 V to 0.35 V
Frequency cruise condition:
Oxygen sensor frequency is judged malfunction under the
following conditions:
1. Number of fail judgement
2. Neither pass nor fail determined yet
COMPONENT OPERATING RANGE
Parameter
Voltage output of the front heated oxygen sensor rapidly fluctuates between 0.4 V and 0.5 V
O2S TEST RESULT
Refer to page DI−295 for detailed information.
Front HO2S frequency monitor (cruse)
If the $90 is out of the standard value, the ECM interprets this as a malfunction.
TEST ID
$90
WIRING DIAGRAM
Refer to DTC P0130 on page DI−411.
INSPECTION PROCEDURE
HINT:
Hand−held tester only:
Narrowing down the trouble area is possible by performing "A/F CONTROL" ACTIVE TEST (heated oxygen
sensor or other trouble areas can be distinguished). Perform ACTIVE TEST using hand−held tester (A/F
CONTROL).
(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 the engine at 2,500 rpm for approximately 90 seconds.
(4) Select the item "DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL."
(5) Perform "A/F CONTROL" with the engine in an idle condition (press the right or left button).
2005 CELICA (RM1131U)
DIAGNOSTICS
Description of TEST DATA
Remained value of that average of
switching frequency is subtracted
from average of switching frequen-
cy threshold
− ENGINE (2ZZ−GE)
Sum of cycle threshold
1 time
Sum of cycle threshold x 1.2 x 10 / number of summation
Both 1 and 2 are met
Conversion Factor
Multiply by 0.04096 plus 5.2
622
10 times
Threshold
1 sec. or more
1 time or more
Standard value
sec.
Unit