1995 TOYOTA SUPRA Service Repair Manual

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Page 2073 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE
(See page EG±310)
(See page IN±30).
(1) Connect SST (check harness ªAº).
(See page EG±510)
SST 09990±01000
(2) Warm up engine to normal operating temperature.
Measure volta

Page 2074 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±180).
Remove EGR gas temp. sensor.
Measure resistance between terminals of EGR gas
temp. sensor connector.
Resistance: 64 Ð 97k at 50°C (122°F)
11 Ð 1 6k at 100°C (212°F)
2 Ð

Page 2075 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 Low 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 t i f l ECU i it

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±503. EG±568
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

Page 2076 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page IN±30).
Check for ECM power source circuit (See page
EG±576), and check for open in harness and
connector between terminal +B of data link
connector 1 and main relay.
(1) Turn ignition swi

Page 2077 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page IN±30).
(See page IN±30).(See page IN±30).
(See page EG±323)
(See page IN±30).
(1) Remove the LH quarter trim panel.
(See page EG±323)
(2) Disconnect fuel pump ECU connector.
Measure v

Page 2078 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

Page 2079 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE
PNP...Go to page EG±574.
(See page EG±514).
Setting the test mode.
(1) Turn ignition switch OFF.
(2) Connect terminals TE2 and E1 of DLC2.
(3) Turn ignition switch ON.
(For chec

Page 2080 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±292)
(See page EG±510)
(See page AC±62)
(1) Remove throttle body.
(See page EG 291)
(2) Apply vacuum to throttle opener.
(See page EG±292)
Measure resistance between terminals 3 (IDL1

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