Page 833 of 1807
F03376
ECM
VTO2
IDL2
Sub-throttle
Position Sensor 39
E10
E963
GR-R G-O
T1519
GR-R GR-R 3
T15
26
T15BR 12V
VTA2
12V
12V
GE01
E01 B BA A
12V
12V 12
T15
T15
25
T15
T15
23
T15
13
T15 W-B (Shielded)
L
Y
R
B Sub-throttle
Valve Motor
6
4
3
1
2
ED EC
IDL2
E1 11
24
Trottle Control ECU DI-542
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
770 Author: Date:
1997 SUPRA (RM502U)
DTC 71, 72 Emergency Fuel Cut
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
71
Vehicle stability control required signal is received 2 times
continuously from ECM and throttle control ECU is detected
the motor system malfunction. The 2nd vehicle stability re-
quired signal is received more or less than 0.5 sec.
Sub-throttle valve motor
Sub-throttle valve
Th ttl t l ECU
72Vehicle stability control required signal is received 2 times
continuously from ECM.Throttle control ECU
WIRING DIAGRAM
DI4W7-01
Page 834 of 1807
F03377
3
6
41
F03378BE6653F03379F03380
ON
IDL2
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-543
771 Author: Date:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check sub-throttle valve motor.
PREPARATION:
Disconnect sub-throttle valve motor connector.
CHECK:
Check continuity between each terminal of sub-throttle valve
motor connector.
OK:
Terminals 1 and 3Continuity
Terminal 4 and 6
Continuity
(Reference value 0.40 - 0.48 W)
NG Replace sub-throttle valve motor.
OK
2 Check voltage between terminal IDL2 of throttle control ECU and body ground.
PREPARATION:
(a) Remove throttle control ECU with connectors still con-
nected.
(b) Remove intake air duct.
(c) Disconnect sub-throttle valve motor connector.
(d) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IDL2 of throttle control ECU
and body ground, when the sub-throttle valve is fully closed
and fully open.
OK:
Sub-throttle valve positionVoltage
Fully closed0 - 3 V
Fully open9 - 14 V
OK Go to step 4.
NG
Page 835 of 1807
DI-544
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
772 Author: Date:
1997 SUPRA (RM502U)
3 Check for open and short in harness and connector between terminal IDL2 of
throttle control ECU and sub-throttle osition sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
4 Check sub-throttle position sensor (See page DI-243).
NG Adjust or replace sub-throttle position sensor
(See page SF-44).
OK
5 Check for open and short in harness and connector between terminal E01, E1 of
throttle control ECU and body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
Page 836 of 1807
F03400
J/B No.1
GAUGE 12
Throttle Control
ECU
WA ABS
Warning Light
Y L
L
L
L ABS ECU
12V
WA5 11
A20
IF2T5
T161E 42
T5
12
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-545
773 Author: Date:
1997 SUPRA (RM502U)
DTC 81 ABS Control System Malfunction
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
81Engine speed is 500 rpm or more and ABS warning light is ON
for 12 sec. or more.Wire harness and connector (WA circuit)
ABS ECU
Throttle control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check the DTC for the ABS (See page DI-501).
*1 Repair ABS control system according to the
code output.
*2
*1: Output NG code
*2: Malfunction indicator light remains ON
DI4W8-01
Page 837 of 1807
BE6653F03401F03402
ON
WA
DI-546
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
774 Author: Date:
1997 SUPRA (RM502U)
2 Check voltage between terminal WA of throttle control ECU and body ground
(See page IN-28).
PREPARATION:
Remove throttle control ECU with connectors still connected.
CHECK:
Measure voltage between terminal WA of throttle control ECU
and body ground.
OK:
Voltage: 9 - 14 V
NG Check and replace ABS ECU.
OK
3 Check for short in harness and connector between terminal WA of ABS ECU and
throttle control ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
Page 838 of 1807
F03403
Throttle Control ECU
WT
12V
CSW
T16T16
6 10
LG-R LG-R
IF22
TRAC OFF Switch
(TRAC Control Switch)
LG
4 6 W-B
IG IEW-B W-BLG-R
13 OPA DLC2 J/B No.1
GAUGE
1E12
Y
T52TRAC OFF
Indicator
T58
LG-R
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-547
775 Author: Date:
1997 SUPRA (RM502U)
TRAC OFF Indicator Light, TRAC OFF Switch Circuit
CIRCUIT DESCRIPTION
This is the TRAC control main switch. When the TRAC OFF switch is pushed on, TRAC control goes off and
the TRAC OFF indicator lights up. This indicator blinks for warnings when the trouble occurs and for display-
ing DTC.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check DTC.
Check DTC on page DI-501.
YES Repair circuit indicated by the code output.
NO
DI4W9-01
Page 839 of 1807
F03404
TRAC OFF Switch
(TRAC Control Switch) 4
6
DI-548
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
776 Author: Date:
1997 SUPRA (RM502U)
2 Check TRAC OFF switch.
PREPARATION:
(a) Remove TRAC OFF switch (TRAC control switch).
(b) Disconnect TRAC control switch connector.
CHECK:
Measure resistance between terminals 4 and 6 of TRAC control
switch when TRAC OFF switch is on and off.
OK:
TRAC OFF switchResistance
Pushed inContinuity
Released1 MW or higher
NG Replace TRAC control switch.
OK
3 Check for open and short in harness and connector between terminal CSW of
throttle control ECU and TRAC control switch and body ground
(See page IN-28).
NG Repair or replace harness or connector.
OK
4 Check TRAC OFF indicator light.
See combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK
Page 840 of 1807
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-549
777 Author: Date:
1997 SUPRA (RM502U)
5 Check for open and short in harness and connector between terminal WT of
throttle control ECU and TRAC OFF indicator light (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace throttle control ECU.