1997 TOYOTA SUPRA engine

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).

BE6653S02439A03139
START
Check Harness A
ECM
57, 56, 55, 54
53, 52 IGT3
(+)
IGT2
(+)
IGT1
(+)
IGT4
(+)IGT5
(+)IGT6
(+)
FI6952
IGT 1 - 6, IGF signal waveform
2 V/
Division
IGT 1 - 6
0
IGF
0
20 msec./Division (Idling)
DI-254
- DIAGNOSTICSENGINE (2JZ-GTE)
482 Author
: Date
:
1997 SUPRA (RM502U)
4 Check for open and short in harness and connector in IGT 1 ~ 6 signal circuit
between ECM and igniter (See page IN-28).
NG Repair or replace harness or connector.
OK
5 Check voltage between terminal IGT 1 - 6 of ECM connector and body ground.
PREPARATION:
Connect Check Harness A (See page DI-164).
CHECK:
Measure voltage between terminal IGT 1 ~ 6 of ECM connector
and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
Reference INSPECTION USING OSCILLOSCOPE
During cranking or idling, check waveforms between terminal
IGT 1 - 6, IGF and E1 of ECM.
HINT:
The correct rectangular waveforms are as shown.
NG Check and replace ECM (See page IN-28).
OK

BE6653S02439A03139
START
Check Harness A
ECM
57, 56, 55, 54
53, 52 IGT3
(+)
IGT2
(+)
IGT1
(+)
IGT4
(+)IGT5
(+)IGT6
(+)
BE6653S02440A06728
ON " START
2(+)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-255
483 Author
: Date
:
1997 SUPRA (RM502U)
6 Disconnect igniter connector and check voltage between terminal IGT 1 ~ 6 of
ECM connector and body ground.
PREPARATION:
(a) Disconnect igniter connector.
(b) Connect Check Harness A (See page DI-164).
CHECK:
Measure voltage between terminal IGT 1 - 6 of ECM connector
and body ground when engine is cranked.
OK:
Voltage: More than 0.1 V and less than 4.5 V
NG Check and replace ECM (See page IN-28).
OK
7 Check voltage between terminal 2 of igniter connector and body ground.
PREPARATION:
Disconnect igniter connector.
CHECK:
Measure voltage between terminal 2 of igniter connector and
body ground, when ignition switch is turned to ºONº and
ºSTARTº position.
OK:
Voltage: 9 - 14 V
NG Check and repair igniter power source circuit.
OK

DI-256
- DIAGNOSTICSENGINE (2JZ-GTE)
484 Author
: Date
:
1997 SUPRA (RM502U)
8 Check for open and short in harness and connector between ignition switch and
ignition coil, ignition coil and igniter (See page IN-28).
NG Repair or replace harness or connector.
OK
9 Check ignition coil (See page IG-1).
NG Replace ignition coil.
OK
Replace igniter.

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-257
485 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1335 Crankshaft Position Sensor Circuit
Malfunction (during engine running)
CIRCUIT DESCRIPTION
Refer to ºCrankshaft Position Sensor ºAº Circuit Malfunctionº on page DI-212.
DTC No.DTC Detecting ConditionTrouble Area
P1335No crankshaft position sensor signal (NE signal) to ECM with
engine speed 1,000 rpm or more

Open or short in crankshaft position sensor circuit for NE
signal

Crankshaft position sensor for NE signal

Starter

ECM
See DTC P0335 for the WIRING DIAGRAM and INSPECTION PROCEDURE.
DI4TD-01

FI6571
Sub Throttle Position
SensorECM
5V
B+ VCC
VTA2
IDL2
E2
DI-258
- DIAGNOSTICSENGINE (2JZ-GTE)
486 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1400 Sub Throttle Position Sensor Malfunction
CIRCUIT DESCRIPTION
The sub throttle position sensor is built and operates in the
same way as the main throttle position sensor. This sensor is
used for traction control. The sub throttle valve is opened and
closed by the sub throttle actuator according to signals from the
throttle control ECU to control the engine output.
DTC No.DTC Detecting ConditionTrouble Area
P1400
Condition (a) or (b) continues:
(a) VTA 2 < 0.25 V, and closed sub throttle position switch is
OFF
(b) VTA 2 > 4.9 V
Open or short in sub throttle position sensor circuit

Sub throttle position sensor

ECM
WIRING DIAGRAM
Refer to page DI-184 for the WIRING DIAGRAM.
DI4TE-01

BE6653P23933A07640A06729
ON
Check Harness A
ECM
B65, 63, 42
VTA2 (+)
IDL2 (+) E2 (-)
Sub Throttle Valve
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-259
487 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Check voltage between terminals VTA2, IDL2 and E2 of ECM.
PREPARATION:
(a) Connect Check Harness A (See page DI-164).
(b) Turn ignition switch ON.
(c) Remove intake air connector pipe and disconnect sub
throttle valve actuator connector.
CHECK:
Measure voltage between terminals VTA2, IDL2 and E2 of ECM
when the sub throttle valve is opened gradually from the closed
condition.
OK:
Throttle ValveTerminal VTA2Terminal IDL2
Fully Closed0.3 - 0.8 V0 - 3.0 V
Fully Open3.2 - 4.9 V9 - 14 V
HINT:
The voltage should increase steadily in proportion to the throttle
valve opening angle.
OK Check for intermittent problems
(See page DI-147).
NG