Page 784 of 1807
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-493
721 Author: Date:
1997 SUPRA (RM502U)
4 Does ABS warning light go off if short pin is removed?
NO Check for short in harness and connector be-
tween warning light and DLC1 and ECU (See
page IN-28).
YES
5 Check ABS solenoid relay (See step No.2).
NG Replace ABS control relay.
OK
Repair or replace and check for short in harness and connector between DLC1 and ABS solenoid
relay (See page IN-28).
Page 794 of 1807
DI4VS-01
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-503
731 Author: Date:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843-18020, connect the terminals Tc and E
1.
If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, turn to the page referred to under the ºSee pageº for the respective ºDTC No.º in the DTC chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI-509)Throttle control relay circuit open
Throttle control relay
TRAC fuse
Wire harness and connector (throttle control relay circuit)
Throttle control ECU
12
(DI-509)Throttle control relay circuit short
Throttle control relay
Wire harness and connector (throttle control relay circuit)
Throttle control ECU
21
(DI-513)Sub-throttle valve motor circuit open or short
Sub-throttle valve motor
Wire harness and connector (sub-throttle valve motor and
E01 circuit)
Throttle control ECU
22
(DI-513)Sub-throttle valve motor malfunction
Sub-throttle valve motor
Sub-throttle valve
Sub-throttle position sensor
Wire harness and connector (E1 circuit)
Throttle control ECU
23
(DI-516)Throttle body malfunction
Sub-throttle valve
Sub-throttle position sensor
Throttle control ECU
24
(DI-519)Sub-throttle position sensor leakage/sub-throttle valve stuck
Sub-throttle valve
Sub-throttle position sensor
Wire harness and connector (E1 circuit)
Throttle control ECU
31
(DI-522)Throttle position sensor signal malfunction
Throttle position sensor
Wire harness and connector (throttle position senor and E1
circuit)
Throttle control ECU
32
(DI-526)Sub-throttle position sensor signal malfunction
Sub-throttle position sensor
Sub-throttle valve motor
Sub-throttle valve
Wire harness and connector (sub-throttle position senor and
E1 circuit)
Throttle control ECU
41
(DI-530)Engine revolution signal open or short
Wire harness and connector (NE circuit)
ECM
Throttle control ECU
42
(DI-532)ECM malfunction
Wire harness and connector (EFIF circuit)
ECM
Throttle control ECU
43
(DI-534)ECM communication circuit malfunction
Wire harness and connector (EFI+ and EFI- circuit)
ECM
Throttle control ECU
51
(DI-535)Power source voltage down
(sub-throttle valve in a bad condition)Wire harness and connector (+B and E01 circuit)
Throttle control ECU
Page 796 of 1807
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
Page 800 of 1807
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
Page 801 of 1807
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
Page 802 of 1807
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
Page 803 of 1807
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.
Page 826 of 1807
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
TRAC
L-R
BR-B
B
2
12A2
15
4 3
51
65
5
T15
EC IB5 T16T16T16
IB5 IB5
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
DI-535
763 Author: Date:
1997 SUPRA (RM502U)
DTC 51, 52 Power Source Circuit
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
51In case power source voltage comes down, sub-throttle valve
angle difference occurs.Wire harness and connector (+B and E01 circuit)
Throttle control ECU
52Engine speed is 500 rpm or more and throttle relay is ON and
ECU terminal +B voltage is less than 8 V for 10 sec. or more.
Battery
IC regulator
Wire harness and connector (+B and E01 circuit)
Throttle control ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check battery positive voltage.
OK:
Voltage: 10 - 14 V
NG Check and repair the charging system.
OK
DI4W5-01
