1997 TOYOTA SUPRA diagram

BE6653S02437A03033
ON
Check Harness A
B72, 71
HT1(+) HTS(+)
ECM
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-197
425 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0135 Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 1)
DTC P0141 Heated Oxygen Sensor Heater Circuit
Malfunction (Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to ºInsufficient Coolant Temp. for Closed Loop Fuel Controlº on page DI-190.
DTC No.DTC Detecting ConditionTrouble Area
P0135
When the heater operates, heater current exceeds 2 A
(2 trip detection logic)
Open or short in heater circuit of heated oxygen sensor
Htd htP0135
P0141Heater current of 0.25 A or less when the heater operates
(2 trip detection logic)
Heated oxygen sensor heater

ECM
HINT:

Bank 1 refers to the bank that includes cylinder No.1.

Sensor 1 refers to the sensor closer to the engine body.

Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to page DI-190 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check voltage between terminals HT1, HTS 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 terminals HT1, HTS of ECM connec-
tor and body ground.
HINT:

Connect terminal HT1 to bank 1 sensor 1.

Connect terminal HTS to bank 1 sensor 2.
OK:
Voltage: 9 - 14 V
OK Check and replace ECM (See page IN-28).
NG
DI4SW-01

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-199
427 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0136 Heated Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to ºInsufficient Coolant Temp. for Closed Loop Fuel Controlº on page DI-190.
DTC No.DTC Detecting ConditionTrouble Area
P0136
Voltage output of the heated oxygen sensor (bank 1 sensor 2)
remains at 0.4 V or more or 0.5 V or less when the vehicle is
driven at 40 km/h (25 mph) or more after the engine is warmed
up
(2 trip detection logic)

Heated oxygen sensor
HINT:

Bank 1 refers to the bank that includes cylinder No.1.

Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to page DI-190 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P0136) being output?
YES Go to relevant DTC chart.
NO
2 Check for open and short in harness and connector between ECM and heated
oxygen sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
DI4SX-01

FI6934
Battery
B
2A
1
AM2
R/B No.2 2 W-R
IB1 4Ignition Switch
B-W
76IJ19
B-O
1 Solenoid Resistor
2
3
4
8
7
62
2
2
2
2
21
1
1
1
1
1 Injector
No.1
No.2
No.3
No.4
No.5
No.6R-L
R-Y
R-G
R-W
R
R-B
BR
BR
ED
B
B
B
B
B
B
B
B 20
19
18
17
16
15
80
79#10
#20
#30
#40
#50
#60
E01
E02
ECM
W-R
W B-YGR BRL
FI6588
FI6538
A00064
100 m sec./Division (Idling)
1 m sec./Division (Idling)
Injection Duration 10 V/
Division(Magnification)
GND GND 10 V/
Division
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-205
433 Author
: Date
:
1997 SUPRA (RM502U)
WIRING DIAGRAM
Reference INSPECTION USING OSCILLOSCOPE
INJECTOR SIGNAL WAVEFORM
With the engine idling, measure between terminals #10 - #60 and E01 of ECM.
HINT:
The correct waveform is as shown.

P22425
Knock Sensor 1
(On front side)
1W
Knock Sensor 2
(On rear side)
1WB
B 50
49
KNK2 KNK1ECM
E1
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-209
437 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0325 Knock Sensor 1 Circuit Malfunction
DTC P0330 Knock Sensor 2 Circuit Malfunction
CIRCUIT DESCRIPTION
Knock sensors are fitted one each to the front and rear of the left side of the cylinder block to detect engine
knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes de-
formed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition
timing is retarded to suppress it.
DTC No.DTC Detecting ConditionTrouble Area
P0325No knock sensor 1 signal to ECM with engine speed between
2,050 rpm and 5,950 rpm
Open or short in knock sensor 1 circuit

Knock sensor 1 (looseness)

ECM
P0330No knock sensor 2 signal to ECM with engine speed between
2,050 rpm and 5,950 rpm
Open or short in knock sensor 2 circuit

Knock sensor 2 (looseness)

ECM
If the ECM detects the above diagnosis conditions, it operates the fail safe function in which the corrective
retard angle value is set to the maximum value.
WIRING DIAGRAM
DI4T0-01

S03471
Camshaft Position
Sensor No.1
Camshaft Position
Sensor No.2
Camshaft Position
Sensor1
1
1 2
2
2W
O
B-W
L
B-R
BR BR26
6
25
27
7 B
B
B
B
BG1
G1

G2
NE
NE

E1 ECM DI-212
- DIAGNOSTICSENGINE (2JZ-GTE)
440 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0335 Crankshaft Position Sensor ºAº Circuit
Malfunction
CIRCUIT DESCRIPTION
The crankshaft position sensor (NE signal) consist of a signal plate and a pick up coil. The NE plate has 24
teeth and is mounted on the crankshaft.
When the camshaft rotates, the protrusion on the signal plate and the air gap on the pick up coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pick up coil.
The NE signal sensor generates 24 signals for every engine revolution. The ECM detects the standard
crankshaft angle based on the G1, G2 signals, detects the actual crankshaft angle and the engine speed
by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0335
No crankshaft position sensor signal (NE signal) to ECM dur-
ing cranking
(2 trip detection logic)
Open or short in crankshaft position sensor circuit for NE
signal
C k h ft iti f NE i lP0335No crankshaft position sensor signal (NE signal) to ECM with
engine speed 600 rpm or more
(2 trip detection logic)
Crankshaft position sensor for NE signal

Starter

ECM
WIRING DIAGRAM
DI4T1-01

FI6975
Throttle ValveVSVECM
EGR Valve
EGR Gas
Temp. Sensor
Exhaust Gas
Air
Intake
ChamberEGR
Vacuum
Modulator
S01078
R/B No.2
Battery R/B No.2
B
B-W
W-B EFI No.1
1
2A2 2
2 2 2
3
2 1
5
EFI Main Relay
B-Y B-R2
8
EA2
EA1VSV For EGR1
2 B-R P
GR
EGR Gas
Temp. Sensor
2
1BR-Y
W-BECM
75
24
46
65B
B
B
BEGR
E01
+B
M-REL
5V
THG
E2
EB
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-217
445 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0401 Exhaust Gas Recirculation Flow Insufficient
Detected
CIRCUIT DESCRIPTION
The EGR system recirculates exhaust gas, which is controlled to the proper quantity to suit the driving condi-
tions, into the intake air mixture to slow down combustion, reduce the combustion temperature and reduce
NOx emissions. The amount of EGR is regulated by the EGR vacuum modulator according to the engine
load.
If even one of the following conditions is fulfilled, the VSV is
turned ON by a signal from the ECM. This results in atmospher-
ic air acting on the EGR valve, closing the EGR valve and shut-
ting off the exhaust gas (EGR cut-off).
Under the following conditions, EGR is cut to maintain driveabil-
ity.

Before the engine is warmed up.

During deceleration (throttle valve closed).

Light engine load (amount of intake air very small).

Engine racing.
DTC No.DTC Detecting ConditionTrouble Area
P0401
After the engne is warmed up and run at 80 km/h (50 mph) for
3 to 5 min., the EGR gas temperature sensor value does not
exceed 45°C (113°F) above the ambient air temperature
(2 trip detection logic)
EGR valve stuck closed

Short in VSV circuit for EGR

Open in EGR gas temp. sensor circuit

EGR hose disconnected

ECM
WIRING DIAGRAM
DI4T3-01

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-227
455 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0402 Exhaust Gas Recirculation Flow Excessive
Detected
CIRCUIT DESCRIPTION
Refer To Exhaust Gas Recirculation Flow Insufficient Detected on page DI-217.
DTC No.DTC Detecting ConditionTrouble Area
P0402
EGR gas temp. sensor value is high during EGR cut-off when
engine is cold (Race engine at about 4,000 rpm without load so
that vacuum is applied to port E)
(2 trip detection logic)
EGR valve stuck open

EGR VSV open malfunction

Open in VSV circuit for EGR
Sh t i EGR t i itEGR valve is always open
(2 trip detection logic)
Short in EGR gas temp. sensor circuit

ECM
See DTC P0401 for CONFIRMATION CHECK DRIVING PATTERN and WIRING DIAGRAM.
INSPECTION PROCEDURE
TOYOTA hand-held tester
1 Connect the TOYOTA hand-held tester and read EGR gas temperature value.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn ignition switch ON and push the TOYOTA hand-held tester main switch ON.
CHECK:
Read EGR gas temperature on the TOYOTA hand-held tester.
OK:
EGR gas temp.: 150°C (302°F) or less. (Not immediately after driving)
HINT:
If there is a short circuit, the TOYOTA hand-held tester indicates 159.3°C (318.7°F).
OK Go to step 4.
NG
DI4T4-01

S05422
To Turbo
Charcoal
Canister
Fuel Tank
ECMIntake Manifold VSV for
EVAP
S01079
Battery
EB
W-B
BB-W
R/B No.2
EFI No.1
EFI Main Relay
2 2A
2
2 2
2
35
1 2
B-R
B-YB-REA22VSV for EVAP
1274
B
ECM
EVAP
E01
B+
GR24
A
M-REL
V
EA18 1 DI-234
- DIAGNOSTICSENGINE (2JZ-GTE)
462 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0441 Evaporative Emission Control System
Incorrect Purge Flow
CIRCUIT DESCRIPTION
To reduce HC emissions, evaporated fuel from the fuel tank is routed through the charcoal canister to the
intake manifold for combustion in the cylinders.
The ECM changes the duty signal to the VSV for EVAP so that the intake quantity of HC emissions is ap-
propriate for the driving conditions (engine load, engine speed, etc.) after the engine is warme up.
DTC No.DTC Detecting ConditionTrouble Area
P0441
The proper response to the computer command does not oc-
cur
(2 trip detection logic)

Open or short in VSV circuit for EVAP

VSV for EVAP

Vacuum hose blocked or disconnected

ECM

Charcoal canister
WIRING DIAGRAM
DI4T6-01