1997 TOYOTA SUPRA engine

A00492
ON
Throttle Position
SensorECM
4
3
2(+)
1(-)41
43
64
65
B
5V
IDL1
E2
B B
VTA1
B+
BVCC
DI-246
- DIAGNOSTICSENGINE (2JZ-GTE)
474 Author
: Date
:
1997 SUPRA (RM502U)
OBDII scan tool (excluding TOYOTA hand-held tester)
1 Check for open and short in harness or ECM.
PREPARATION:
(a) Disconnect the throttle position sensor connector.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminals 1 and 2 of throttle position
sensor connector.
OK:
Voltage: 9 - 14 V
OK Confirm good connection at sensor.
If OK, replace throttle position sensor.
NG
2 Check for open and short in harness and connector between throttle position
sensor and ECM (See page IN-28).
NG Open or short in harness between ECM and
throttle position sensor.
OK
Confirm connection at ECM.
If OK, replace ECM.

S03241S03242
A06719
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-215
443 Author
: Date
:
1997 SUPRA (RM502U)
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
The camshaft position sensors (G1 and G2 signals) consist of a signal plate and a pick up coil.
The G1, G2 signal plates each have one tooth on the outer circumference and are mounted on the intake
side of the cylinder head.
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 ECM detects the standard crankshaft angle based on the G1, G2 signals, detects the actual crankshaft
angle and engine speed by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0340
No camshaft position sensor signal to ECM with engine speed
600 rpm or more
Open or short in camshaft position sensor circuit

Camshaft position sensor
StarterP0340
No crankshaft position sensor signal to ECM during cranking

Starter

ECM
WIRING DIAGRAM
Refer to page DI-212 for the WIRING DIAGRAM.
INSPECTION PROCEDURE
1 Check resistance of camshaft position sensors.
PREPARATION:
Disconnect camshaft position sensor connector.
CHECK:
Measure resistance of camshaft position sensors.
OK:
Resistance
Cold835 - 1,400 W
Hot1,060 - 1,645 W
ºColdº is from - 10°C (14°F) to 50°C (122°F) and ºHotº is from
50°C (122°F) to 100°C (212°F).
DI4T2-01

FI6519A03396
G. NE Signal Waveforms
5 V/Division
20 m sec./Division (Idling) G1
G2
NE
DI-216
- DIAGNOSTICSENGINE (2JZ-GTE)
444 Author
: Date
:
1997 SUPRA (RM502U)
Reference INSPECTION USING OSCILLOSCOPE

During cranking or idling, check between ECM terminals
G1, G2 and G1
, NE and NE
of ECM.
HINT:
The correct waveforms are as shown.
NG Replace distributor.
OK
2 Check for open and short in harness and connector between ECM and camshaft
position sensor (See page IN-28).
NG Repair or replace harness or connector.
OK
3 Inspection sensor installation.
NG Tighten the sensor.
OK
Check and replace ECM (See page IN-28).

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-247
475 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1100 Barometric Pressure Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
The BARO sensor is built into the ECM. This is a semiconductor pressure sensor with properties which cause
its electrical resistance to change when stress is applied to the sensor's crystal (silicon) (piezoelectric effect).
This sensor is used to detect the atmospheric (absolute) pressure and outputs corresponding electrical sig-
nals. Fluctuations in the air pressure cause changes in the intake air density, which can cause deviations
in the air-fuel ratio. The signals from BARO sensor are used to make corrections for these fluctuations. If
the ECM detects DTC P1100, the fail safe function operates and the atmospheric pressure is set at a
constant 760 mmHg.
DTC No.DTC Detecting ConditionTrouble Area
P1100Open or short detected in barometric pressure sensor circuit
(2 trip detection logic)
ECM
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P1100) being output?
YES Go to relevant DTC chart.
NO
Replace ECM.
DI4TA-01

S05428
Battery
B
W-B
EFI No.1
EB
R/B
No.2
2A12
B-D
R/B
No.2
2
2 2 2
51
32
EFI No.2 Relay
B-R L-O
E1 L-O
B-R
B-R 5EA2
BP1
BI
2
W-B
W-B
Fuel
Pump
5 4
L
6BP1
5L-R
FP4 Fuel Pump ECU
B+
B+
E
1DI FPCVSV for
Fuel Pressure
12
W-L
IB1IC2
73
22
21
B
A
A
V-WV-W
V-W
GG
G 1211
124IC2IJ1
IJ1
IC2
DI FPC5VEO1 FPUECM
5
10 DI-248
- DIAGNOSTICSENGINE (2JZ-GTE)
476 Author
: Date
:
1997 SUPRA (RM502U)
DTC P1200 Fuel Pump Relay/ECU Circuit Malfunction
CIRCUIT DESCRIPTION
The fuel pump speed is controlled at 2 steps (high speed, low speed) by the condition of the engine (starting,
light load, heavy load), when the engine starts (STA ON), the ECM sends a Hi signal (about 5 V) to the fuel
pump ECU (FPC terminal).
The fuel pump ECU then outputs Hi voltage (battery positive voltage) to the fuel pump so that the fuel pump
operates at high speed.
After the engine starts, during idling or light loads, the ECM outputs a Low signal (about 2.5 V) to the fuel
pump ECU, the fuel pump ECU outputs Low voltage (about 9 V) to the fuel pump and causes the fuel pump
to operate at low speed.
If the intake air volume increases (high engine load), the ECM sends a Hi signal to the fuel pump ECU and
causes the fuel pump to operate at high speed.
DTC No.DTC Detecting ConditionTrouble Area
Open or short in fuel pump circuit for 1 sec. or more with en-
gine speed 1,000 rpm or less
(2 trip detection logic)

Open or short in fuelpumpECU circuit
P1200
Open in input circuit of fuel pump ECU (FPC) with engine
speed 1,000 rpm or less
(2 trip detection logic)

Open or short in fuel pump ECU circuit

Fuel pump ECU

ECM power source circuit

Fuel pump
Open or short in diagnostic signal line (DI) of fuel pump ECU
with engine speed 1,000 rpm or less
(2 trip detection logic)
Fuel um

ECM
WIRING DIAGRAM
DI4TB-01

BE6653S03247S03248
A03137
ON
1(+)
BE6653S03247S03249
A03138
START
5 (+)
8 (-)
- DIAGNOSTICSENGINE (2JZ-GTE)
DI-249
477 Author
: Date
:
1997 SUPRA (RM502U)
INSPECTION PROCEDURE
1 Connect the TOYOTA hand-held tester and check operation of fuel pump
(See page SF-5).
OK Go to step 7.
NG
2 Check voltage of fuel pump ECU power source.
PREPARATION:
(a) Remove LH quarter trim panel (See page SF-83).
(b) Disconnect fuel pump ECU connector.
(c) Turn ignition switch ON.
CHECK:
Measure voltage between terminal 1 of fuel pump ECU connec-
tor and body ground.
OK:
Voltage: 9 - 14 V
NG Check for open and short in harness and con-
nector between EFI main relay (Marking: EFI
MAIN) and fuel pump ECU (See page IN-28).
OK
3 Check voltage between terminals 5 and 8 of fuel pump ECU connector.
PREPARATION:
(a) Remove LH quarter trim panel (See page SF-83).
(b) Disconnect fuel pump ECU connector.
CHECK:
Measure voltage between terminals 5 and 8 of fuel pump ECU
connector when ignition switch is turned to start.
OK:
Voltage: 4.5 - 5.5 V
OK Go to step 5.
NG

DI-250
- DIAGNOSTICSENGINE (2JZ-GTE)
478 Author
: Date
:
1997 SUPRA (RM502U)
4 Check for open and short in harness and connector between terminals FPC of
ECM and 5 of fuel pump ECU, terminal 8 of fuel pump ECU and body ground
(See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
5 Check fuel pump (See page SF-5).
NG Repair or replace fuel pump.
OK
6 Check for open and short in harness and connector between terminal 2 and fuel
pump and body ground (See page IN-28).
NG Repair or replace harness or connector.
OK
Replace fuel pump ECU.

- DIAGNOSTICSENGINE (2JZ-GTE)
DI-251
479 Author
: Date
:
1997 SUPRA (RM502U)
7 Check for open and short in harness and connector between terminals DI of
ECM and 6 of fuel pump ECU (See page IN-28).
NG Repair or replace harness or connector.
OK
Check and replace ECM.