display TOYOTA SUPRA 1997 Service Owner's Manual

DI4VA-01
DI-452
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
680 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.
NOTICE:
When removing the ECU, turn the IG switch OFF.
SymptomsInspection CircuitSee page
ABS does not operate.
Only when 1. - 4. are all normal and the problem is still occurring, replace the ABS
ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. IG power source circuit.
3. Speed sensor circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page DI-498).
DI-442
DI-475
DI-469
BR-66 or XXX
ABS does not operate
efficiently.
Only when 1. - 4. are all normal and the problem is still occurring, replace the ABS
ECU.
1. Check the DTC, reconfirming that the normal code is output.
2. Speed sensor circuit.
3. Stop light switch circuit.
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage (See page DI-498).
DI-442
DI-469
DI-482
BR-66 or BR-66
ABS warning light
abnormal.1. ABS warning light circuit.
2. ABS ECU.DI-488
DTC check cannot be done.
Only when 1. and 2. are all normal and the problem is still occurring, replace the
ABS ECU.
1. ABS warning light circuit.
2. Tc terminal circuit.
DI-488
DI-494
Speed sensor signal check
cannot be done.1. Ts terminal circuit.
2. ABS ECU.DI-496XXX

DI-486
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
714 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Is DTC output?
Check DTC on page DI-442.
YES Repair circuit indicated by the code output.
NO
2 Is normal code displayed?
YES Check ABS solenoid relay. Check for short in
harness and connector between ABS solenoid
relay and DLC1 (See page IN-28).
NO
3 Is ABS warning light go off?
YES Check for open or short in harness and conec-
tor between ECU-IG Fuse and ECU
(See page IN-28).
NO
4 Check battery positive voltage.
PREPARATION:
Start the engine.
CHECK:
Check the battery positive voltage.
OK:
Voltage: 10 - 16 V
NG Check and repair the charging system.
OK

F03361
ABS ECU
12 V
Tc
A20 A1998
*1 *2
R
R
R
IF1
11
P-B
II1 DLC1
R
*121*2P-B R
*1
*2
DLC2
11 Tc E
13
BR
BR BR
ED
IJ1 18BR
Tc E
134
NORMAL ABS (2JZ-GE Engine)
SPORT ABS (2JZ-GTE Engine)
*1:
*2:
S-17-1 Iei-23-1-A
F00041
DLC2
DLC1
E1Tc
E1
Tc
DI-494
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
722 Author
: Date
:
1997 SUPRA (RM502U)
Tc Terminal Circuit
CIRCUIT DESCRIPTION
Connecting terminals Tc and E1 of the DLC1 or the DLC1 or the DLC2 causes the ECU to display the DTC
by flashing the ABS warning 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 If ABS warning light does not blink even after Tc
and E1 are connected, the ECU may be defec-
tive.
NG
DI4VM-01

R01346
Normal Code
2 sec.
0.25
sec.
0.25
sec.
ON
OFF
Code 11 and 21
ON
OFF0.5 sec.
2.5 sec. 4.5 sec.1.5
sec. 0.5 sec.
Code 11Code 21
F03366
ECU-B
J/B No.1 DI-502
- DIAGNOSTICSABS & TRACTION CONTROL SYSTEM
730 Author
: Date
:
1997 SUPRA (RM502U)
(3) Read the DTC from the TRAC OFF indicator light on
the combination meter.
HINT:

If no code appears, inspect the diagnostic circuit or TRAC
OFF indicator light circuit (See page DI-553 or
DI-547).

As an example, the blinking patterns for normal code and
codes 11 and 21 are shown on the left.
(4) Codes are explained in the code table on page
DI-503.
(5) After completing the check, disconnect terminals Tc
and E1, and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.
(c) Clear the DTC.
(1) Remove the ECU-B fuse from the J/B No.1 for 10
sec. or more.
(2) Install the ECU-B fuse.
(3) Confirm that the TRAC OFF indicator light shows
the normal code.

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

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

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

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

DI4WG-01
DI-560
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
788 Author
: Date
:
1997 SUPRA (RM502U)
DIAGNOSTIC TROUBLE CODE CHART
DTC No.
(See Page)Detection ItemTrouble AreaSRS
Warning Light
(N l)
System normal-OFF(Normal)
(DI-595)
Source voltage drop
Battery

Airbag sensor assemblyON
11
(DI-564)

Short in squib circuit (to ground)
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
12
(DI-571)

Short in squib circuit (to B+)
Steering wheel pad (D squib)

Front passenger airbag assembly (P squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
13
(DI-577)

Short in D squib circuit
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
14
(DI-582)

Open in D squib circuit
Steering wheel pad (D squib)

Spiral cable

Airbag sensor assembly

Wire harness
ON
31
(DI-586)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
53
(DI-588)
Short in P squib circuit
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
ON
54
(DI-592)
Open in P squib circuit
Front passenger airbag assembly (P squib)

Airbag sensor assembly

Wire harness
ON
HINT:

When the SRS warning light remains lit up and the DTC is the normal code, this means a source voltage
drop.
This malfunction is not stored in memory by the airbag sensor assembly and if the power source volt-
age returns to normal, after approx. 10 seconds the SRS warning light will automatically go out.

When 2 or more codes are indicated, the codes will be displayed in numeral order starting from the
lowest numbered code.

If a code not listed on the chart is displayed, the airbag sensor assembly is faulty.

DI4WJ-01
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-563
791 Author
: Date
:
1997 SUPRA (RM502U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
Problem SymptomInspection ItemPage

WIth the ignition switch at ACC or ON, the SRS warning light
sometimes lights up after approx. 6 seconds have elapsed.

SRS warning light lights up even when ignition switch is in the
LOCK position.

SRS warning light system malfunction (Always lit up when
ignition switch is in LOCK position.)DI-598

WIth the ignition switch at ACC or ON, the SRS warning light
does not light up.
SRS warning light system malfunction (Does not light up
when ignition switch is turned to ACC or ON.)DI-600

DTC not displayed.

SRS warning light is always lit up with a DTC check procedure.

DTC displayed without Tc and E
1 terminal connection.

Tc terminal circuitDI-603