Page 606 of 1807
S02435
Battery
B
W-BEFI No.1
R/B No.2R/B No.2
EFI Main Relay
2
2A 1
B-W
2 22
2
1
2 3 5B-YB-R
8
EA1
B-REA25
B-RGR
W24
48A
BM-REL
OX1
23
1 4
B-L Heated Oxygen
Sensor
(Bank 1 Sensor 1)
B
B
B
EA2
B-R B-R
B-R B-R
R-L
IJ1
IC1
2
4 20
23
1 4 Heated
Oxygen
Sensor
(Bank 1
Sensor 2)
IC1
20
IC1
IJ2
IC1
IJ1
BRBR
BR
BR-WBR-W
8
18 12R-L 9
IJ2
BR
BR-W5 R-L1471
41
72ECM
B+
E1
HT1
E01
OXS
E1
HTS
E01
EDEBBR
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-191
419 Author: Date:
1997 SUPRA (RM502U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Connect the OBD II scan tool or TOYOTA hand-held tester and read value for
voltage output of heated oxygen sensor.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC 3.
(b) Warm up engine to normal operation temperature.
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 accelerator pedal.
OK:
Both heated oxygen sensors (bank 1 sensor 1) output a RICH signal (0.45 V or more) at least
once.
OK Check and replace ECM (See page IN-28).
NG
Page 607 of 1807
DI-192
- DIAGNOSTICSENGINE (2JZ-GTE)
420 Author: Date:
1997 SUPRA (RM502U)
2 Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
Replace heated oxygen sensor.
Page 608 of 1807
FI7130
Vehicle speed
50 - 65 km/h
(31 - 40 mph)
Idling
IG SW OFF(5) (3)
(1) (2)
1 - 3 min.1 min.
Time
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-193
421 Author: Date:
1997 SUPRA (RM502U)
DTC P0130 Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 1)
CIRCUIT DESCRIPTION
Refer to ºInsufficient Coolant Temp. for Closed Loop Fuel Controlº on page DI-190.
DTC No.DTC Detecting ConditionTrouble Area
P0130
Voltage output of heated oxygen sensor remains at 0.4 V or
more, or 0.55 V or less, during idling after the engine is
warmed up (2trip detection logic)Heated oxygen sensor
Fuel trim malfunction
HINT:
Bank 1 refers to the bank that includes cylinder No.1.
Sensor 1 refers to the sensor closer to the engine body.
The heated oxygen sensor output voltage and the short-term fuel trim value can be read using the OBD II
scan tool or TOYOTA hand-held tester.
WIRING DIAGRAM
Refer to page DI-190 for the WIRING DIAGRAM.
CONFIRMATION DRIVING PATTEN
(1) Connect the TOYOTA hand-held tester to the DLC3.
(2) Switch the TOYOTA hand-held tester from normal mode to check mode (See page DI-147).
(3) Start the engine and warm it up with all accessory switches OFF.
(4) Drive the vehicle at 50 - 65 km/h (31 - 40 mph) for 1 - 3 min. to warm up the heated oxygen sensor.
(5) Let the engine idle for 1 min.
HINT:
If a malfunction exists, the MIL will light up during step (5).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a TOYOTA hand-held tester, turn the ignition switch OFF after performing steps
(3) to (5), then perform steps (3) to (5) again.
DI4SU-01
Page 609 of 1807
DI-194
- DIAGNOSTICSENGINE (2JZ-GTE)
422 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
2 Check for heated oxygen sensor data.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC 3.
(b) Warm up engine to normal operating temperature.
CHECK:
Read the heated oxygen sensor output voltage and short-term fuel trim.
RESULT:
PatternHeated oxygen sensor output voltageShort-term fuel trim
1Lean condition (Changes at 0.55 V or less)Changes at about +20 %
2Rich condition (Changes at 0.4 V or more)Changes at about -20 %
3Except 1 and 2
1, 2 Check fuel trim system (See page DI-201).
3
Page 610 of 1807
P18349
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-195
423 Author: Date:
1997 SUPRA (RM502U)
3 Check the output voltage of heated oxygen sensor during idling.
PREPARATION:
Warm up the heated oxygen sensor with the engine at 2,500 rpm for approx. 90 sec.
CHECK:
Use the OBD II scan tool or TOYOTA hand-held tester read the output voltage of the heated oxygen sensor
during idling.
OK:
Heated oxygen sensor output voltage:
Alternates repeatedly between less than 0.4 V and more than 0.55 V (See the following table).
OK Perform confirmation driving pattern
(See page DI-193).
NG
Replace heated oxygen sensor.
Page 612 of 1807
BE6653S02437A03033
ON
Check Harness A
B72, 71
HT1(+) HTS(+)
ECM
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-197
425 Author: Date:
1997 SUPRA (RM502U)
DTC P0135 Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 1)
DTC P0141 Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to ºInsufficient Coolant Temp. for Closed Loop Fuel Controlº on page DI-190.
DTC No.DTC Detecting ConditionTrouble Area
P0135
When the heater operates, heater current exceeds 2 A
(2 trip detection logic)Open or short in heater circuit of heated oxygen sensor
Htd htP0135
P0141Heater current of 0.25 A or less when the heater operates
(2 trip detection logic)Heated oxygen sensor heater
ECM
HINT:
Bank 1 refers to the bank that includes cylinder No.1.
Sensor 1 refers to the sensor closer to the engine body.
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to page DI-190 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check voltage between terminals HT1, HTS of ECM connector and body ground.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals HT1, HTS of ECM connec-
tor and body ground.
HINT:
Connect terminal HT1 to bank 1 sensor 1.
Connect terminal HTS to bank 1 sensor 2.
OK:
Voltage: 9 - 14 V
OK Check and replace ECM (See page IN-28).
NG
DI4SW-01
Page 613 of 1807
DI-198
- DIAGNOSTICSENGINE (2JZ-GTE)
426 Author: Date:
1997 SUPRA (RM502U)
2 Check resistance of heated oxygen sensor heater (See page SF-82).
NG Replace heated oxygen sensor.
OK
Check and repair harness or connector be-
tween EFI main relay (Making: EFI MAIN) and
heated oxygen sensor and ECM.
Page 614 of 1807
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-199
427 Author: Date:
1997 SUPRA (RM502U)
DTC P0136 Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to ºInsufficient Coolant Temp. for Closed Loop Fuel Controlº on page DI-190.
DTC No.DTC Detecting ConditionTrouble Area
P0136
Voltage output of the heated oxygen sensor (bank 1 sensor 2)
remains at 0.4 V or more or 0.5 V or less when the vehicle is
driven at 40 km/h (25 mph) or more after the engine is warmed
up
(2 trip detection logic)
Heated oxygen sensor
HINT:
Bank 1 refers to the bank that includes cylinder No.1.
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to page DI-190 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0136) being output?
YES Go to relevant DTC chart.
NO
2 Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
DI4SX-01
