1997 TOYOTA SUPRA traction control

DI4VT-01
W02272
Rear Speed Sensor Rotor SLIP Indicator Light
TRAC OFF Indicator Light
SNOW Indicator Light
Throttle Control Relay
(TRAC Solenoid Relay)TRAC OFF
Switch SNOW Mode
Switch
ABS ECU
ECM Throttle Control ECU
DLC1
Throttle Position Sensor
Sub-throttle
Position Sensor
Front Speed Sensor Rotor
Sub-throttle Valve MotorFront Speed SensorFront Speed Sensor RotorRear Speed Sensor
DLC2
Front Speed Sensor
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-505
733 Author
: Date
:
1997 SUPRA (RM502U)
PARTS LOCATION

DI7HK-01
R00463
13 12 11
26 25 24 23 22 21 20 19 18 17 16 15 14 16 15 14 13 12 11 10 91 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 10 Throttle Contrl ECU
T15T16
DI-506
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
734 Author
: Date
:
1997 SUPRA (RM502U)
TERMINALS OF ECU
Symbols (Terminal No.)STD Voltage (V)Condition
BATT (T16-1) - E1 (T15-26)9 - 14Always
+B (T16-9) - E1 (T15-26)9 - 14IG switch ON, Engine stops
EFIB (T15-1) - E1 (T15-26)9 - 14IG switch ON, Engine stops
IDL1 (T15 4) E1 (T15 26)0 - 3IG switch ON, Throttle valve fully closedIDL1 (T15-4) - E1 (T15-26)9 - 14IG switch ON, Throttle valve fully open
VTA1 (T15 6) E1 (T15 26)0.3 - 0.8IG switch ON, Throttle valve fully closedVTA1 (T15-6) - E1 (T15-26)3.2 - 4.9IG switch ON, Throttle valve fully open
IDL2 (T15 3) E1 (T15 26)0 - 3Engine running, Sub-throttle valve fully closedIDL2 (T15-3) - E1 (T15-26)9 - 14Engine running, Sub-throttle valve fully open
VTA2 (T15 19) E1 (T15 26)0.3 - 0.8Engine running, Sub-throttle valve fully closedVTA2 (T15-19) - E1 (T15-26)3.2 - 4.9Engine running, Sub-throttle valve fully open
FRO (T16-16) - E1 (T15-26)Pulse generationVehicle driving at about 30 km/h (19 mph)
FLO (T16-8) - E1 (T15-26)Pulse generationVehicle driving at about 30 km/h (19 mph)
RRO (T16-15) - E1 (T15-26)Pulse generationVehicle driving at about 30 km/h (19 mph)
RLO (T16-7) - E1 (T15-26)Pulse generationVehicle driving at about 30 km/h (19 mph)
WT (T16 10) E1 (T15 26)0 - 3IG switch ON, TRAC OFF indicator light ONWT (T16-10) - E1 (T15-26)9 - 14IG switch ON, TRAC OFF indicator light OFF
IND (T16 2) E1 (T15 26)0 - 3IG switch ON, SLIP indicator light ONIND (T16-2) - E1 (T15-26)9 - 14IG switch ON, SLIP indicator light OFF
CSW (T16 6) E1 (T15 26)0 - 3IG switch ON, TRAC OFF switch holded on pushingCSW (T16-6) - E1 (T15-26)9 - 14IG switch ON, TRAC OFF switch released
RLY+ (T16-4) - RLY- (T16-12)9 - 14IG switch ON
SIND (T16 11) E1 (T15 26)0 - 3IG switch ON, SNOW indicator light ONSIND (T16-11) - E1 (T15-26)9 - 14IG switch ON, SNOW indicator light OFF
SNOW (T16 14) E1 (T15 26)0 - 3IG switch ON, SNOW mode switch holded on pushingSNOW (T16-14) - E1 (T15-26)9 - 14IG switch ON, SNOW mode switch released
A (T15-12) - E01 (T15-13)Pulse generationEngine running, Throttle valve fully closed
A (T15-11) - E01 (T15-13)Pulse generationEngine running, Throttle valve fully closed
B (T15-25) - E01 (T15-13)Pulse generationEngine running, Throttle valve fully closed
B (T15-24) - E01 (T15-13)Pulse generationEngine running, Throttle valve fully closed
NE (T15-16) - E1 (T15-26)Pulse generationIdling
FAIL (T15 9) E1 (T15 26)Pulse generationIG switch ON (normal condition)FAIL (T15-9) - E1 (T15-26)9 - 14IG switch ON (abnormal condition)
EFIF (T15 17) E1 (T15 26)0 - 2IG switch ON, ECM normal conditionEFIF (T15-17) - E1 (T15-26)4.5 - 5.5IG switch ON, ECM abnormal condition

- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-507
735 Author
: Date
:
1997 SUPRA (RM502U)EFI+ (T15-7) - E1 (T15-26)
Pulse generationIG switch ON
EFI- (T15-20) - E1 (T15-26)Pulse generationIG switch ON
ETC+ (T15-8) - E1 (T15-26)Pulse generationIG switch ON
ETC- (T15-21) - E1 (T15-26)Pulse generationIG switch ON
TC (T16-3) - E1 (T15-26)4.5 - 5.5IG switch ON, Engine stops
WA (T16 5) E1 (T15 26)9 - 14IG switch ON, ABS ECU normal conditionWA (T16-5) - E1 (T15-26)0 - 3IG switch ON, ABS ECU abnormal condition

DI4VV-01
DI-508
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
736 Author
: Date
:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomInspection CircuitSee page
TRAC does not operate.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring,replace the throttle control ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. Power source circuit.
3. Speed sensor circuit.
DI-501
DI-535
DI-538
SLIP indicator light
abnormal.SLIP indicator light circuit.DI-550
SNOW indicator light
abnormal.1. SNOW indicator light circuit.
2. SNOW made switch circuit.DI-551
DI-551
TRAC OFF indicator light
abnormal.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring,replace the throttle control ECU.
1. TRAC OFF indicator light circuit.
2. TRAC OFF switch circuit.
DI-547
DI-547
DTC check cannot be done.
Only when inspection circuits for each problem symptom are all normal and the
problem is still occurring,replace the throttle control ECU.
1. TRAC OFF indicator light circuit.
2. Tc terminal circuit.
DI-547
DI-553

DI4VW-01
F03368
Throttle Control
ECU R/B No.5
Throttle Control Relay
(TRAC Solenoid Relay)
R/B
No.2
Battery+B
RLY-
RLY+
E01 9
12
4
13
BR L-B BR-BL-R 14
11
12
L-B L-Y L-R
BR-B
B2
1
2A5
4
2
13
IB5
T16
T15
EC 51
65
5
IB5
IB5T16
T16
TRAC
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-509
737 Author
: Date
:
1997 SUPRA (RM502U)
CIRCUIT INSPECTION
DTC 11, 12 Throttle Control Relay Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
11Instead of throttle control relay is ON, voltage at +B of ECU
terminal does not output 4 V or more for 1 sec. or more.

Throttle control relay

TRAC fuse

Wire harness and connector (throttle control relay circuit)

Throttle control ECU
12Instead of throttle control relay is OFF, voltage at +B of ECU
terminal outputs 4 V or more for 2 sec. or more.
Throttle control relay

Wire harness and connector (throttle control relay circuit)

Throttle control ECU
WIRING DIAGRAM

F03369
R/B No.2
TRAC
F03370BE6053F06762
LOCK
R/B No.5
(-) (+)
DI-510
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
738 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check TRAC fuse.
PREPARATION:
Remove TRAC fuse from R/B No.2.
CHECK:
Check continuity of TRAC fuse.
OK:
Continuity
NG Check for short in all harness and components
connected to TRAC fuse.
OK
2 Check voltage between terminal 1 of R/B No.5 (for throttle control relay).
PREPARATION:
Remove throttle control relay from P/B No.5.
CHECK:
Measure voltage between terminal 1 of R/B No.5 (for throttle
control relay).
OK:
Voltage: 10 - 14 V
NG Repair or replace harness or connector.
OK

F03372F03373F03374
F03375
3
61
4
Open
Continuity
Continuity
31
4
61 3
64
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-51 1
739 Author
: Date
:
1997 SUPRA (RM502U)
3 Check throttle control relay.
PREPARATION:
Remove throttle control relay from R/B No.5
CHECK:
Check continuity between each terminal of throttle control relay.
OK:
Terminals 4 and 6Continuity (Reference value 80 W)
Terminals 1 and 3Open
CHECK:
(a) Apply battery voltage between terminals 4 and 6.
(b) Check continuity between terminals.
OK:
Terminals 1 and 3Continuity
NG Replace throttle control relay.
OK

DI-512
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
740 Author
: Date
:
1997 SUPRA (RM502U)
4 Check for open and short in harness and connector between throttle control
relay and throttle control ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.
If the connections are normal, the ECU may be defective.