Toyota T100 1996 Service Manual page 434

DI−170
HINT:
After confirming DTC P0125 use the OBD II scan tool or TOYOTA hand−held tester to confirm voltage output
of heated oxygen sensor from "CURRENT DATA".
If voltage output of heated oxygen sensor is 0 V, heated oxygen sensor circuit may be open or short.
WIRING DIAGRAM
From
9
IG Switch
EA1
2
1 2 3
5
2
2
2
2
2 2 1
From Battery
To Body Ground
INSPECTION PROCEDURE
1 Connect OBD II scan tool or TOYOTA hand−held tester and read value for
voltage output of heated oxygen sensor (bank 1 sensor 1).
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand−held tester to the DLC3.
(b) Warm up the engine to normal operating temp.
CHECK:
Read voltage output of heated oxygen sensor (bank 1 sensor 1) when engine is suddenly raced.
HINT:
Perform quick racing to 4,000 rpm 3 times using the accelerator pedal.
OK:
Heated oxygen sensor (bank 1 sensor 1) output a RICH signal (0.45 V or more) at least once
NG
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
9
W−R W−R W−R
IE1
R/B No.2
2
Heated
Oxygen
Sensor
(Bank 1
1
Sensor 2)
− ENGINE (5VZ−FE)
Heated
2 3
Oxygen
Sensor
(Bank 1
Sensor 1)
1 4
P−G
3
4
BR
BR
R−G
EB
OK Check and replace ECM (See page IN−26).
5 13
W
E6 E6
3 16
E5 E7
13 19
OX2
R
E6 E6
24 16
E7 E5
9 15
HT2
E5 E7
(M/T)(A/T)
ECM
OX1
E1
HT1
E03
E1
E1
E03
P19611