TOYOTA SUPRA 1997 Service Repair Manual

S03407S03406
A03150
1 V/Division
2 V/Division
EFI+, EFI- SIgnal Waveform
ETC+, ETC- SIgnal Waveform EFI+
0
EFI-
0
1 msec./Division
(Idling or IG switch ON)
1 msec./Division
(Idling or IG switch ON) ETC+
0
ETC-
0
DI-286
- DIAGNOSTICSENGINE (2JZ-GTE)
514 Author
: Date
:
1997 SUPRA (RM502U)
2 Check for open and short in harness and connector between terminals EFI+,
EFI-, ETC+ and ETC- of throttle control ECU and ECM (See page IN-28).
Reference INSPECTION USING OSCILLOSCOPE

With engine idling or IG switch ON measure waveforms
between terminals EFI+, EFI- and E2 of ECM.

With engine idling or IG switch ON measure waveforms
between terminals ETC+, ETC- and E2 of ECM.
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28).

S03236
CAC Air Bypass ValveAir
CleanerECM
Pressure
Tank
Intake
Air Control Valve (IACV)
Actuator (for IACV)
VSV for IACV
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-287
515 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1652 IACV Control Circuit Malfunction
CIRCUIT DESCRIPTION
The valve controls the opening or closing of the No.2 intake air passage in order to pass the charge air from
No.2 turbocharger.
DTC No.DTC Detecting ConditionTrouble Area
P1652
During idling, voltage level at the output terminal (VSV1) of
ECM is low
(2 trip detection logic)
Open or short in VSV circuit for IACV

VSV for IACV

ECM
DI4TO-01

S03469
Battery
EB
B
2A2
1 R/B
No.2
EFI No.1B-W
22 R/B
No.2
35
2 2 2
1 B-R
B-Y5
EA2B-R
8
EA1B-R
EFI Relay
12
G-R38
BVSV3B+ ECM
E01
M-RELVSV2
VSV1E01
B+ E01 39
B
40
B
24
A VSV for Exhaust
Bypass Valve
G-Y
G-B 1
12
2 B-R
B-R
B-R
GR
W-B
VSV for Exhaust
Gas Control Valve
VSV for Intake
Air Control Valve
DI-288
- DIAGNOSTICSENGINE (2JZ-GTE)
516 Author
: Date
:
1997 SUPRA (RM502U)
WIRING DIAGRAM

BE6653S03252S03253
A03147
ON
Air
Air
Air Filter
E
E
F
VSV: ON
VSV: OFF
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-289
517 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and check operation of VSV for IACV.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to DLC3.
(b) Turn ignition switch ON and TOYOTA hand-held tester
main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-
held tester.
CHECK:
Check operation of VSV when VSV is operated by the TOYOTA
hand-held tester.
OK:
VSV is ON:
Air from pipe E flows out through pipe F.
VSV is OFF:
Air from pipe E flows out through the air filter.
OK Check for intermittent problems
(See page DI-147).
NG
2 Check VSV for IACV (See page SF-61).
NG Replace VSV for IACV.
OK
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI MAIN) and ECM (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28).

BE6653S03238
A03151
ON
Check Harness A
ECM
VSV1 (+)
B40
DI-290
- DIAGNOSTICSENGINE (2JZ-GTE)
518 Author
: Date
:
1997 SUPRA (RM502U)
OBDII scan tool (excluding TOYOTA hand-held tester)
1 Check VSV for IACV (See page SF-61).
NG Replace VSV for IACV.
OK
2 Check voltage between terminal VSV1 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 terminal VSV1 of ECM connector
and body ground.
OK:
Voltage: 9 - 14 V
NG Check and repair harness or connector.
OK
Check and replace ECM (See page IN-28).

S03468
Battery
EB
B
2A2
1 R/B
No.2
EFI No.1B-W
223 5
2 2 2
1
EFI Main Relay W-B
GR
GR 8
EA1 B-R5
EA2B-R12
L-W60
B
VSV for Waste
Gate ValveVSV4B+ ECM
E01
M-RELB+
24
A
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-291
519 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1658 Waste Gate Valve Control Circuit
Malfunction
CIRCUIT DESCRIPTION
Refer to ºBoost Pressure High Malfunctionº on page DI-274.
DTC No.DTC Detecting ConditionTrouble Area
P1658
Under VSV operation condition of the waste gate at repid ac-
celerating, changes of voltage level can be found at the output
terminal (VSV4) of ECM
(2 trip detection logic)
Open or short in VSV circuit for waste gate valve

VSV for waste gate valve

ECM
WIRING DIAGRAM
DI4TP-01

DI-292
- DIAGNOSTICSENGINE (2JZ-GTE)
520 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and check operation of VSV for waste
gate valve (See page DI-266).
OK Go to step 3.
NG
2 Check VSV for waste gate valve (See page SF-63).
NG Replace VSV for waste gate valve.
OK
3 Check for open and short in harness and connector between EFI main relay
(Marking: EFI MAIN) and ECM (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28).
OBDII scan tool (excluding TOYOTA hand-held tester)
1 Check VSV for waste gate valve (See page DI-266).
NG Replace VSV for waste gate valve.
OK

BE6653S03237
A03152
ON
Check Harness A
ECM
VSV4 (+)B60
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-293
521 Author
: Date
:
1997 SUPRA (RM502U)
2 Check voltage between terminal VSV4 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 terminal VSV4 of ECM connector
and body ground.
OK:
Voltage: A/T 9 - 14 V
M/T3 V or less
NG Check and repair harness or connector be-
tween VSV for waste gate valve and ECM
(See pageIN-28 ).
OK
Check and replace ECM (See page IN-28).

S03236
Exhaust Gas Control Valve
ECM
Pressure
Tank Air
Cleaner Actuator (for Exhaust
Gas Control Valve)
VSV for Exhaust
Gas Control
Valve
DI-294
- DIAGNOSTICSENGINE (2JZ-GTE)
522 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1661 Exhaust Gas Control Valve Control Circuit
Malfunction
CIRCUIT DESCRIPTION
The valve controls the opening or closing of the No.2 exhaust passage in order to operate No.2 turbocharger.
DTC No.DTC Detecting ConditionTrouble Area
P1661
During idling, voltage level at the output terminal (VSV2) of
ECM is low
(2 trip detection logic)
Open or short in VSV circuit for exhaust gas control valve

VSV for exhaust gas control valve

ECM
WIRING DIAGRAM
Refer to page DI-266 for the WIRING DIAGRAM.
DI4TQ-01

BE6653S03254S03255A06731
ON
Air Air
E
FE
Air Filter
VSV: ON VSV: OFF
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-295
523 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and check operation of VSV for exhaust
gas control valve.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to DLC3.
(b) Turn ignition switch ON and TOYOTA hand-held tester
main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-
held tester.
CHECK:
Check operation of VSV when VSV is operated by the TOYOTA
hand-held tester.
OK:
VSV is ON:
Air from pipe E flows out through pipe F.
VSV is OFF:
Air from pipe E flows out through the air filter.
OK Check for intermittent problems
(See page DI-147).
NG
2 Check VSV for exhaust gas control valve (See page SF-65).
NG Replace VSV for exhaust gas control valve.
OK