1995 TOYOTA SUPRA Service Repair Manual

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Page 2049 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE
HINT: When other codes are output in addition to 27 at the same time, check the circuits for other codes first.
(See page EG±510)
(1) Connect SST (check harness ªAº).
(See page

Page 2050 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±321)
Disconnect sub heated oxygen sensor connector.
(See page EG±321)
Measure resistance between terminals 1 and 2 of
sub heated oxygen sensor connector.
Resistance: 11 Ð 16 at 20°

Page 2051 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 31 Mass Air Flow Meter Circuit
CIRCUIT DESCRIPTION
The mass air flow meter is an air flow meter which uses a platinum hot wire. The hot wire air flow meter
works on the principle that when the ele

Page 2052 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page IN±30).
(See page EG±510)(1) Connect SST (check harness ªAº).
(See page EG±510)
SST 09990±01000
(2) Start engine.
Measure voltage between terminals VG and E21 of
engine control module

Page 2053 of 2543

TOYOTA SUPRA 1995 Service Repair Manual CIRCUIT DESCRIPTION
To control maximum turbocharging pressure the turbocharger system includes a waste gate valve con-
trolled by an actuator. The actuator is controlled by the manifold pressure which

Page 2054 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (1) Check actuator hose connection.
(2) Disconnect actuator hose.
(3) Using SST, apply pressure to the actuator.
SST 09992±00241
Waste gate valve operate smoothly.
Operation pressure:
119 kpa (1.2 kg

Page 2055 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±510)
(1) Remove VSV.
(2) Disconnect VSV connector.
Check operation of VSV for waste gate valve when
battery positive voltage is applied and released to
the VSV terminals.
Battery positiv

Page 2056 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 35 Turbo Pressure Sensor Circuit Barometric Pressure (BARO)
Sensor Circuit
CIRCUIT DESCRIPTION
HINT DTC 35 is used to indicate malfunctions in the turbo pressure sensor circuit or BARO sensor c

DTC 35 Turbo Pressure Sensor Circuit Barometric Pressure (BARO)
Sensor Circuit
CIRCUIT DESCRIPTION
HINT DTC 35 is used to indicate malfunctions in the turbo pressure sensor circuit or BARO sensor circuit.
1. TURBO PRESSURE SENSOR
This sensor detects the air intake chamber pressure and converts the pressure reading into a voltage which
is used to control the turbo pressure by the ECM.
If the ECM detects the below diagnosis conditions, it operates the fail safe function in which the ECM stops
fuel injection at engine speed 2,400 rpm or more and throttle opening angle 20° or more.

DTC No.
Circuit
Diagnostic Trouble Code Detecting Condition
Trouble Area

35

Turbo
Pressure
Sensor

Open or short in turbo pressure sensor
circuit for 0.5 sec. or more

Open or short in turbo
pressure sensor circuit
Turbo pressure sensor
ECM
2. BARO SENSOR
This sensor is built into the ECM. It is used to detect the atmospheric (absolute) pressure and outputs corre-
sponding electrical signals. 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
the fluctuations. If the ECM detects the below diagnosis conditions, it operates the fail safe function in which
the atmospheric pressure is assumed to be 101.3 kPa (1.03 kgf/cm
2, 14.7 psi).
DTC No. Circuit Diagnostic Trouble Code Detecting Condition Trouble Area

35

BARO
Sensor

Open or short in BARO sensor circuit for
0.5 sec. or more

ECM
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±549

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