1997 TOYOTA SUPRA turn signal

BE6653
FI7058A00486
ON
Throttle Position
SensorECM
4
3
2
141
43
64
65B
B
B
B
VCC5V
VTA1
B+
IDL1
E2
A00716
ON
Throttle Position
Sensor
ECM
4
3
2
141
43
64
65
B
5V
IDL1
E2B B
VTA1
B+
BVCC
Check Harness A
ECM
B65, 64
IDL1 E2
DI-244
- DIAGNOSTICSENGINE (2JZ-GTE)
472 Author
: Date
:
1997 SUPRA (RM502U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Disconnect the throttle position sensor connector.
(c) Connect sensor wire harness terminals between termi-
nals 1 and 2.
(d) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand-held tester.
OK:
CTP switch signal: ON
OK Confirm good connection at sensor.
If OK, replace throttle position sensor.
NG
3 Check for open in harness or ECM.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Connect between terminals IDL and E2 of ECM connec-
tor.
HINT:
Throttle position sensor connector is disconnected.
Before checking, do a visual check and contact pressure check
for the connector (See page IN-28).
(c) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand-held tester.
OK:
CTP switch signal: ON
OK Open in harness between ECM and throttle
position sensor, repair or replace harness.
NG
Confirm connection at ECM.
If OK, replace ECM.

BE6653A00499A00488
ON
Throttle Position
SensorECM
4
3
2
141
43
64
65
B
5V
IDL1
E2B B
VTA1 B+
BVCC
A00717
ON
Throttle Position
Sensor
ECM
4
3
2
141
43
64
65
B
5V
IDL1
E2
BB
VTA1 B+
BVCC
ECM
B Connector
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-245
473 Author
: Date
:
1997 SUPRA (RM502U)
4 Check for short in harness or ECM.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Disconnect the throttle position sensor connector.
(c) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand-held tester.
OK:
CTP switch signal: OFF
OK Confirm good connection at sensor.
If OK, replace throttle position sensor.
NG
5 Check for short in harness or ECM.
PREPARATION:
(a) DIsconnect the B connector from ECM
(See page DI-164).
HINT:
Throttle position sensor connector is disconnected.
(b) Turn ignition switch ON.
CHECK:
Read CTP switch signal on the TOYOTA hand-held tester.
OK:
CTP switch signal: OFF
OK Short in harness between ECM and throttle
position sensor, repair or replace harness.
NG
Confirm connection at ECM.
If OK, replace ECM.

S03235
Battery
B
R/B
No.22
2A
AM2
W-R W-R
IB147 6
Igniter
Switch
B-O
IJ11B-OB-OB-O B-O B-O
B-O
B-O
B-O
B-O
B-O
B-O
Spark Plug
Ignition Coil No.1
L-YG
Y
Y-B
Y-G
Y-R No.2
No.3
No.4
No.5
No.6 112
1
1
1
1
12
2
2
2
2
2
1
Noise Filter
BRECM
BR
EC
I24Igniter Tr
2
I22
6
5
4
10
11
12
I3 B
B
B
B
B
B
B
1
2
3
9
8
7
357
56
55
54
53
52
58
IGF5V IGT6 IGT5 IGT4IGT3 IGT2 IGT1
Tr1
5V
I3
I3
I3
I3
I3
I2 I3I3 I3 I3 I3I3
R-W
W-R
LG
B-R
L
R
R-Y DI-252
- DIAGNOSTICSENGINE (2JZ-GTE)
480 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1300 Igniter Circuit Malfunction
CIRCUIT DESCRIPTION
The ECM determines the ignition timing, turns on Tr1 at a predetermined angle (°CA) before the desired
ignition timing and outputs an ignition signal (IGT) º1º to the igniter.
Since the width of the IGT signal is constant, the dwell angle control circuit in the igniter determines the time
the control circuit starts primary current flow to the ignition coil based on the engine rpm and ignition timing
one revolution ago, that is, the time the Tr2 turns on.
When it reaches the ignition timing, the ECM turns Tr1 off and outputs the IGT signal º0º.
This turns Tr2 off, interrupting the primary current flow and generating a high voltage in the secondary coil
which causes the spark plug to spark. Also, by the counter electromotive force generated when the primary
current is interrupted, the igniter sends an ignition confirmation signal (IGF) to the ECM.
The ECM stops fuel injection as a fail safe function when the IGF signal is not input to the ECM.
DTC No.DTC Detecting ConditionTrouble Area
P1300No IGF signal to ECM for 6 consecutive IGT signals during
engine running
Open or short in IGF or IGT circuit from igniter to ECM

Igniter

ECM
WIRING DIAGRAM
DI4TC-01

A00720
ONCheck Harness A
ECM
B58
IGF(+)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-253
481 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check spark plug and spark of misfiring cylinder (See page DI-204).
NG Go to step 4.
OK
2 Check for open and short in harness and connector in IGF signal circuit between
ECM and igniter (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Disconnect igniter connector and check voltage between terminal IGF of ECM
connector and body ground.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal IGF of ECM connector and
body ground.
OK:
Voltage: 4.5 - 5.5 V
OK Replace igniter.
NG
Check and replace ECM (See page IN-28).

S05426
From
BatteryR/B
No.2 2
2A
ALT
R/B
No.2
POWER
22W-L
J/B No.1 210
1B 1ESTOP
WStop Light
Switch
21G-W11
IJ1G-W4
A
STPECM
J/B
No.1 1
101H
1C
Light
Failure
Sensor
To Stop LightG-W
7
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-279
507 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1520 Stop Light Switch Signal Malfunction
Only for A/T
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut-off engine speed. (The fuel cut-off engine speed is
reduced slightly when the vehicle is braking.)
DTC No.DTC Detecting ConditionTrouble Area
P1520
The stop light switch does not turn off even once the vehicle is
driven.
(2 trip detection logic)
Short in stop light switch signal circuit

Stop light switch

ECM
WIRING DIAGRAM
DI4TK-01

A00726
ON
ONBrake Pedal
DepressedBrake Pedal
Released
Check Harness A
ECM
A4
STP(+)
DI-280
- DIAGNOSTICSENGINE (2JZ-GTE)
508 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check operation of stop light.
PREPARATION:
Check if the stop lights go on and off normally when the brake
pedal is operated and released.
NG Check and repair stop light circuit.
OK
2 Check STP signal.
When using TOYOTA hand-held tester:
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
CHECK:
Read the STP signal on the TOYOTA hand-held tester.
OK:
Break pedal is depressed: STP ... ON
Break pedal is released: STP ... OFF
When not using TOYOTA hand-held tester:
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
CHECK:
Check voltage between terminal STP of ECM and body ground.
OK:
Brake pedalVoltage
Depressed7.5 - 14 V
ReleasedBelow 1.5 V
OK Check for intermittent problems
(See page DI-147).
NG

DI-302
- DIAGNOSTICSENGINE (2JZ-GTE)
530 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
HINT:
This diagnostic chart is based on the premise that the engine is cranked normally. If the engine is not
cranked, proceed to the matrix chart of problem symptoms on page DI-169.
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and check STA signal.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push TOYOTA hand-held tester main switch ON.
CHECK:
Read STA signal on the TOYOTA hand-held tester while starter operates.
Ignition Switch PositionONSTART
STA SignalOFFON
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-169).
NG
2 Check for open in harness and connector between ECM and starter relay
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-28).

F00007
E1
Tc
Ts
lei-23-1-A
DLC1
BR3904
0.13 sec.
0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
7276
ON
OFF
0.5 sec.
0.5 sec.1.5 sec.
0.5 sec.0.5 sec.2.5 sec.
4 sec.
Repeat DI-444
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
672 Author
: Date
:
1997 SUPRA (RM502U)
2. SPEED SENSOR SIGNAL AND DECELERATION SEN-
SOR
(a) Check the speed sensor signal and deceleration sensor.
(1) Turn the ignition switch OFF
(2) Using SST, connect terminal Ts and E1 of DLC1.
SST 09843-18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:

If the ABS warning light does not blink, inspect the ABS
warning light circuit (See page DI-488).

If the ABS warning light is always on, inspect and repair,
deceleration sensor.
(5) Drive the vehicle faster than 45 km/h (28 mph) for
several seconds.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc an E1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:

See the list of DTC shown on the next page.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunctions are indicated at the same time,
the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect terminals Ts and
E1, Tc and E1 of DLC1, and turn ignition switch OFF.