Toyota T100 1996 Service Manual page 445

2 Check for heated oxygen sensor (bank 1 sensor 1) data.
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 heated oxygen sensor (bank 1 sensor 1) output voltage and short−term fuel trim.
RESULT:
Pattern
1
2
3
1, 2
3 Check fuel pressure (See page SF−5).
OK
4 Check injector injection (See page SF−21).
OK
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
Heated oxygen sensor output voltage
Lean condition (Changes at 0.55 V or less)
Rich condition (Changes at 0.35 V or more)
Except 1 and 2
− ENGINE (5VZ−FE)
3 Check for heated oxygen sensor
(bank 1 sensor 1) (See page DI−172).
NG Check and repair fuel pump, pressure
regulator, fuel pipe line and filter
(See page SF−5).
NG Replace injector.
Short−term fuel trim
Changes at about + 20 %
Changes at about − 20 %
Except 1 and 2
DI−181