1995 TOYOTA SUPRA Service Repair Manual

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Page 1961 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±397).
CIRCUIT DESCRIPTION
The EGR system is designed to recirculate the exhaust gas, controlled according to the driving condi-
tions, back into the intake air±fuel mixture. It helps to

Page 1962 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Malfunction: Open in EGR Gas Temp. Sensor Circuit
(Vehicle Speed)
(1)Disconnect the EFI No.1 fuse (30A) for 10 sec. or more, with IG switch OFF. Initiate
test mode (Connect terminal TE2 and E1 o

Page 1963 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE
(See page
EG±404)
(See page
EG±240)
Check voltage between terminal EGR of engine control module connector
and body ground.
(1) Connect SST (check harness ªAº).
(See page EG±

Page 1964 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Check EGR system (See page Eg±168).
Remove EGR gas temp. sensor.
Measure resistance between terminals of EGR gas
temp. sensor connector.
Resistance: 64 Ð 97 k at 50°C (122°F)
11 Ð 16 k at 100�

Page 1965 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 78 Fuel Pump Control Circuit
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 en

DTC 78 Fuel Pump Control Circuit
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 engine control module sends a Hi signal (battery
positive voltage) 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 engine control module outputs a Low signal (about 9 V)
to the fuel pump ECU, the fuel pump ECU outputs Lo battery 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 engine control module sends a Hi signal to the fuel
pump ECU and causes the fuel pump to operate at high speed.
DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area

(1) Open or short in fuel pump circuit for
1 sec. Or more with engine speed
1,000 rpm or less
(2 trip detection logic)*

O h i f l ECU i i

78

2) 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
Engine control module power source circuit
Fuel pump
Engine control module

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

Engine control module
*: See page EG±397.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±457

Page 1966 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (1) Turn ignition switch ON.
(2) Using SST, connect terminals +B and FP of
data link connector1.
SST 09843±18020
Check that there is pressure in the hose from the
fuel filter.
Fuel pressure can be fe

Page 1967 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page IN±30).
(See page EG±252)
(See page IN±30).
(1) Remove the LH quarter trim panel.
(See page EG±252)
(2) Disconnect fuel pump ECU connector.
Measure voltage between terminals 3 (FPC) an

Page 1968 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 51 Switch Condition Signal Circuit
CIRCUIT DESCRIPTION
Park/Neutral Position Switch
The ECM uses the signals from the park/neutral position switch to determine whether the transmission is in park

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