TOYOTA SUPRA 1997 Service Repair Manual

P20769
70 - 90 km/h
(43 - 56 mph)
Idling
IG SW OFF
Warm up
3 - 5 min.
2 min.3 - 5 min.
2 min.Time
(7) (6)
(5) (7) (3)
(2) (1) DI-218
- DIAGNOSTICSENGINE (2JZ-GTE)
446 Author
: Date
:
1997 SUPRA (RM502U)
SYSTEM CHECK DRIVING PATTERN
(1) Connect the OBDII scan tool or TOYOTA hand-held tester to the DLC3.
(2) Start the engine and warm it up with all accessories switched OFF.
(3) Run the vehicle at 70 - 90 km/h (43 - 56 mph) for 3 min. or more.
(4) Idle the engine for about 2 min.
(5) Stop at safe place and turn the ignition switch OFF.
(6) Start the engine and do steps (3) and (4) again.
(7) Check the ºREADINESS TESTSº mode on the OBDII scan tool or TOYOTA hand-held tester. If ºCOMPLº
is displayed and the MIL does not light up, the system is normal. If ºINCMPLº is displayed and the MIL does
not light up, run the vehicle again and check it.
HINT:
ºINCMPLº is displayed when either condition (a) or (b) exists.

The system check is incomplete.

There is a malfunction in the system.
If there is a malfunction in the system, the MIL will light up after steps (2) to (6) above are done.

A00168
ON
EGR Gas Temp.
Sensor
2
146
65
B
BTHG
ECM
5V
E2
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-219
447 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and read value of EGR gas temperature.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and TOYOTA hand-held tester main switch ON.
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 10°C (50°F) or more
HINT:
If there is an open circuit, the TOYOTA hand-held tester indicates 3.1°C (37.6°F).
OK Go to step 4.
NG
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the EGR gas temp. sensor connector.
(b) Connect sensor wire harness terminals together.
(c) Turn ignition switch ON.
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 159.3°C (318.7°F)
OK Confirm good connection at sensor.
If OK, replace EGR gas temp. sensor.
NG

A00706
ON
EGR Gas
Temp. Sensor
2
1ECM
46
65
B
BTHG
5V
E2
Check Harness A
ECM
B46, 65
E2
(-) THG
(+)
DI-220
- DIAGNOSTICSENGINE (2JZ-GTE)
448 Author
: Date
:
1997 SUPRA (RM502U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Connect between terminals THG and E2 of ECM.
HINT:
EGR gas temp. sensor connector is disconnected. Before
checking, do a visual check and connect pressure check for the
ECM connector (See page IN-28).
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 159.3°C (318.7°F)
OK Open in harness between terminals E2 or THG.
Repair or replace harness.
NG
Confirm connection at ECM.
If OK, replace ECM.
4 Check connection of vacuum hose, EGR hose (See page EC-2).
NG Repair or replace.
OK
5 Check EGR system (See page EC-7).
OK Check and replace ECM (See page IN-28).
NG

A00595
ON
Air
Air
E
F
E
F
System: ON
System: OFF
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-221
449 Author
: Date
:
1997 SUPRA (RM502U)
6 Check the VSV for EGR.
PREPARATION:
Select the ACTIVE TEST mode on the TOYOTA hand-held tes-
ter.
CHECK:
Check operation of VSV when it is operated by the TOYOTA
hand-held tester.
OK:
EGR system is ON:
Air from pipe E flows out through pipe F.
EGR system is OFF:
Air does not flow from pipe E to pipe F.
OK Go to step 8.
NG
7 Check operation of the VSV for EGR (See page SF-69).
NG Replace VSV for EGR.
OK
Check for open in harness and connector be-
tween VSV and ECM (See page IN-28).
8 Check EGR vacuum modulator (See page EC-7).
NG Repair or replace.
OK

DI-222
- DIAGNOSTICSENGINE (2JZ-GTE)
450 Author
: Date
:
1997 SUPRA (RM502U)
9 Check EGR valve (See page EC-7).
NG Repair or replace.
OK
10 Check value of EGR gas temp. sensor.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester. (EGR system ON)
(d) Race the engine at 4,000 rpm for 3 min.
CHECK:
Measure the EGR gas temp. while racing engine at 4,000 rpm.
OK:
EGR gas temp. after 3 min.: 120°C (248°F) or more
NG Replace EGR gas temp. sensor.
OK
Check and replace ECM (See page IN-28).

S03243S03486
A03069
EGR Gas Temp. Sensor
Connector
BE6653S03244S03487A03070
ON
Wire Harness Side
1(-)
2(+)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-223
451 Author
: Date
:
1997 SUPRA (RM502U)
OBDII scan tool (excluding TOYOTA hand-held tester)
1 Check resistance of EGR gas temp. sensor.
PREPARATION:
Disconnect EGR gas temp. sensor connector.
CHECK:
Measure resistance between terminals of EGR gas temp. sen-
sor connector.
OK:
Resistance: 600 kW or less.
HINT:
If there is open circuit, ohmmeter indicates 720 kW or more.
NG Check and replace EGR gas temp. sensor
(See page SF-77).
OK
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect EGR gas temp. sensor connector.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals of EGR gas temp. sensor
wire harness side connector.
OK:
Voltage: 4.5 - 5.5 V
OK Go to step 4.
NG

A00709
ONCheck Harness A
ECM
B46, 65
E2(-)
THG(+)
DI-224
- DIAGNOSTICSENGINE (2JZ-GTE)
452 Author
: Date
:
1997 SUPRA (RM502U)
3 Check for open in harness or ECM.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals THG and E2 of ECM con-
nector.
HINT:
EGR gas temp. sensor connector is disconnected.
OK:
Voltage: 4.5 - 5.5 V
OK Open in harness between terminal E2 or THG.
repair or replace harness.
NG
Confirm connection at ECM.
If OK, replace ECM.
4 Check connection of vacuum hose, EGR hose (See page EC-2).
NG Repair or replace.
OK
5 Check EGR system (See page EC-7).
OK Check and replace ECM (See page IN-28).
NG

A00710
ONCheck Harness A
B75
EGRON
OFF
Air
Air
E
FE
F
VSV: ON VSV: OFF
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-225
453 Author
: Date
:
1997 SUPRA (RM502U)
6 Check the VSV for EGR.
PREPARATION:
(a) Connect Check Harness A to the connectors on the wire
harness side (See page DI-164).
HINT:
The other side of Check Harness A is not connected to the ECM
terminals.
(b) Turn ignition switch ON.
CHECK:
Check VSV function
(1) Connect between terminal EGR of ECM connector
and body ground (ON).
(2) Disconnect between terminal EGR of ECM connec-
tor and body ground (OFF).
OK:
(1) VSV is ON:
Air from pipe E flows out through pipe F.
(2) VSV is OFF:
Air does not flow from pipe E to pipe F.
OK Go to step 8.
NG
7 Check operation of the VSV for EGR (See page SF-77).
NG Replace VSV for EGR.
OK
Check for open in harness and connector be-
tween engine room R/B and ECM
(See page IN-28).

S03243S03486
A03069
EGR Gas Temp. Sensor
Connector
DI-226
- DIAGNOSTICSENGINE (2JZ-GTE)
454 Author
: Date
:
1997 SUPRA (RM502U)
8 Check EGR vacuum modulator (See page EC-7).
NG Repair or replace.
OK
9 Check EGR valve (See page EC-7).
NG Repair or replace.
OK
10 Check resistance of EGR gas temp. sensor.
PREPARATION:
(a) Disconnect EGR gas temp. sensor connector.
(b) For EGR system is ON, connect between terminal EGR
of ECM connector and body ground
(See page DI-217, step 5).
(c) Start the engine and warm it up.
(d) Race the engine at 4,000 rpm for 3 min.
CHECK:
Measure the resistance of the EGR gas temp. sensor while rac-
ing the engine at 4,000 rpm.
OK:
Resistance of EGR gas temp. senor after 3 min. 9.0 kW
or less
HINT:
Resistance: 188.6 - 439.0 kW at 20°C (68°F).
NG Replace EGR gas temp. sensor.
OK
Check and replace ECM (See page IN-28).

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-227
455 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0402 Exhaust Gas Recirculation Flow Excessive
Detected
CIRCUIT DESCRIPTION
Refer To Exhaust Gas Recirculation Flow Insufficient Detected on page DI-217.
DTC No.DTC Detecting ConditionTrouble Area
P0402
EGR gas temp. sensor value is high during EGR cut-off when
engine is cold (Race engine at about 4,000 rpm without load so
that vacuum is applied to port E)
(2 trip detection logic)
EGR valve stuck open

EGR VSV open malfunction

Open in VSV circuit for EGR
Sh t i EGR t i itEGR valve is always open
(2 trip detection logic)
Short in EGR gas temp. sensor circuit

ECM
See DTC P0401 for CONFIRMATION CHECK DRIVING PATTERN and WIRING DIAGRAM.
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and read EGR gas temperature value.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the TOYOTA hand-held tester main switch ON.
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 150°C (302°F) or less. (Not immediately after driving)
HINT:
If there is a short circuit, the TOYOTA hand-held tester indicates 159.3°C (318.7°F).
OK Go to step 4.
NG
DI4T4-01