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 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 841 of 1807
F03405
Throttle Control ECU
IND
T162
W
IF21
W
C127 SLIP
Indicator
Light
C10 Y
1E12 J/B No.1
GAUGE9
DI-550
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
778 Author: Date:
1997 SUPRA (RM502U)
SLIP Indicator Light Circuit
CIRCUIT DESCRIPTION
The SLIP indicator blinks during TRAC operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check SLIP indicator light.
See combination meter troubleshooting on page BE-2.
NG Repair or replace combination meter.
OK
2 Check for short in harness and connector between throttle control ECU and SLIP
indicator light (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace throttle control ECU.
DI4WA-01
Page 842 of 1807
F03406F03406
Throttle Control ECU SNOW
Indicator
Light J/B No.1
SNOW Mode Switch
(TRAC Control Switch)SIND
SNOW GAUGEP-G
P-G
R-B W-B
W-B
W-B
YT1611
T1614 IF19
C125
C109
1E12
IE IG8 6
F03407
6
8
SNOW Mode Switch
(TRAC Control Switch)
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-551
779 Author: Date:
1997 SUPRA (RM502U)
SNOW Indicator Light, SNOW Mode Switch Circuit
CIRCUIT DESCRIPTION
When you push the SNOW mode switch, TRAC control becomes SNOW mode operation and the SNOW
indicator light on, and when you push the TRAC OFF switch, TRAC control will be released to normal mode
operation and the SNOW indicator light goes off.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check SNOW mode switch.
PREPARATION:
(a) Remove SNOW mode switch (TRAC control switch).
(b) Disconnect TRAC control switch connector.
CHECK:
Measure resistance between terminals 6 and 8 of TRAC control
switch when SNOW mode switch on and off.
OK:
TRAC control switchResistance
SNOW mode switch pushed inContinuity
TRAC OFF switch pushed in1 MW or higher
NG Replace TRAC control switch.
OK
DI4WB-01
Page 844 of 1807
F03408
Throttle Control ECU
12V
Tc
R R
R P-B DLC1
Tc E1 BR
BR
BR
BRDLC2
E1Tc
3 11
21
11 3
18
ED3
4
IJ1II1
IF1
T16 P-B
S-17-1F02201F03525
DLC2DLC1
E
1
TcE1
Tc
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-553
781 Author: Date:
1997 SUPRA (RM502U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
By connecting terminals Tc and E1 of DLC1 or DLC2, the ECU displays the DTC by blinking the TRAC OFF
indicator light.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Tc and E1 of DLC2 or DLC1.
PREPARATION:
Turn ignition switch ON.
CHECK:
Measure voltage between terminals Tc and E1 of DLC2 or
DLC1.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown on
problem symptoms chart (See page DI-508).
NG
DI4WC-01
Page 855 of 1807
DI4WK-01
W01021
P squib
D squib
A34
A34
A34
A34L
Y
R
WAirbag Sensor
Assembly
P+3
2
7
6 1
2
1
2D
+
D-
P-
Spiral
Cable
DI-564
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
792 Author: Date:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC 11 Short in Squib Circuit (to Ground)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2.
DTC 11 is recorded a when ground short is detected in the squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
11
Short circuit in squib wire harness (to ground).
Squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Page 862 of 1807
AB0119R05901R14288H07913
P squib
Spiral
CableAirbag Sensor
Assembly
D squib
ON
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-571
799 Author: Date:
1997 SUPRA (RM502U)
DTC 12 Short in Squib Circuit (to B+)
CIRCUIT DESCRIPTION
The squib circuit consists of the airbag sensor assembly, spiral cable, steering wheel pad and front passen-
ger airbag assembly. It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2.
DTC 12 is recorded when a B+ short is detected in the squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
12
Short circuit in squib wire harness (to B+).
Squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.Steering wheel pad (D squib)
Front passenger airbag assembly (P squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
Refer to page DI-564 for the WIRING DIAGRAM.
INSPECTION PROCEDURES
1 Preparation (See step 1 on page DI-595).
2 Check D squib circuit.
CHECK:
For the connector (on the spiral cable side) between the spiral
cable and steering wheel pad, measure the voltage between D
+
and body ground.
OK:
Voltage: 0 V
NG Go to step 7.
OK
DI4WL-01
Page 868 of 1807
R16015
D squibSpiral
Cable1
2R
W7
6Airbag Sensor
Assembly
A34
A34
D-
D+
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-577
805 Author: Date:
1997 SUPRA (RM502U)
DTC 13 Short in D Squib Circuit
CIRCUIT DESCRIPTION
The D squib circuit consists of the airbag sensor assembly, spiral cable and steering wheel pad.
It causes the airbag to deploy when the airbag deployment conditions are satisfied.
For details of the function of each component, see FUNCTION OF COMPONENTS on page RS-2.
DTC 13 is recorded when a short is detected in the D squib circuit.
DTC No.DTC Detecting ConditionTrouble Area
13
Short circuit between D+
wire harness and D- wire harness
of squib.
D squib malfunction.
Spiral cable malfunction.
Airbag sensor assembly malfunction.Steering wheel pad (D squib)
Spiral cable
Airbag sensor assembly
Wire harness
WIRING DIAGRAM
DI4WM-01
