Toyota Camry Manual page 1279

DI–252
2 Connect the OBD II scan tool or TOYOTA hand–held tester, and read value for
voltage output of A/F sensors (bank 1, 2 sensor 1).
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand–held tester to the DLC3.
(b) Warm up the A/F sensors (bank 1, 2 sensor 1) with the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Read voltage value of A/F sensors (bank 1, 2 sensor 1) on the screen of OBD II scan tool or TOYOTA hand–
held tester, when you perform all the following conditions.
HINT:
The voltage of AFRu,AFLu terminal of ECM is 3.3 fixed and the AFRy,AFLy terminal is 3.0 V fixed.
Therefore, it is impossible to check the A/F sensor output voltage at the terminals (AFRu,AFLu/
AFRy,AFLy) of ECM.
OK:
Condition
Engine idling
Engine idling E i idli
Driving at engine speed 1,500 rpm or more and vehicle
speed 40 km/h (25 mph) or move, and operate throttle valve
open and close
HINT:
D
During fuel enrichment, there is a case that the output voltage of A/F sensors (bank 1, 2 sensor 1) is
0.56 V), it is normal.
below 2.8 V (
*
D
During fuel cut, there is a case that the output voltage of A/F sensors (bank 1, 2 sensor 1) is above
3.8 V (
0.76 V), it is normal.
*
D
If output voltage of A/F sensors (bank 1, 2 sensor 1) remains at 3.30 V (
all the above conditions, A/F sensors (bank 1, 2 sensor 1) circuit may be open.
D
If output voltage of A/F sensor remains at 3.8 V (
performing all the above conditions, A/F sensors (bank 1, 2 sensor 1) circuit may be short.
: When you use the OBD II scan tool (excluding TOYOTA hand–held tester).
*
NG
3 Check for open and short in harness and connector between ECM and A/F
sensors (bank1, 2 sensor1) (See page IN–31).
OK
DIAGNOSTICS – ENGINE (1MZ–FE)
D Not remains at 3.3. V (*0.660 V)
N t Not remains at 3.3. V ( 0.660 V) i t 3 3 V (*0 660 V)
D Not remains at 3.8 V (*0.76 V) or more D Not remains at 3 8 V (*0 76 V) or more
D Not remains at 2.8 V (*0.56 V) or less
*: When you use the OBD II scan tool (excluding TOYOTA hand–held tester)
0.76 V) or more, or 2.8 V (
*
OK Go to step 10.
NG Repair or replace harness or connector.
A/F Sensor Voltage value
0.660 V) even after performing
*
0.56 V) or less even after
*
Author : Date :
487