1995 TOYOTA SUPRA Service Repair Manual

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Page 1929 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Replace oxygen sensor.
Go to relevant diagnostic trouble code chart.
Are there any other codes (besides code 21 or 28) being output?
WIRING DIAGRAM
INSPECTION PROCEDURE (Except California specificatio

Page 1930 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE (Only for California specification vehicles)
HINT: If diagnostic trouble code º21º is output, check the main heated oxygen sensor (Fr) circuit.
If diagnostic trouble code º28º

Page 1931 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Check voltage between terminals HT1, HT2 of engine control module
connector and body ground.
INSPECTION USING OSCILLOSCOPE
Replace main heated oxygen sensor.*
Check and replace engine control module.

Page 1932 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 22 Engine Coolant Temp. Sensor Circuit
CIRCUIT DESCRIPTION
The engine coolant temperature sensor senses the
coolant temperature. A thermistor built in the sensor
changes its resistance value acco

Page 1933 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±404)
(1) Connect SST (check harness ªAº).
(See page EG±404)
(2) Turn ignition switch ON.
Measure voltage between terminals THW and E2
of engine control module connector.
Check for int

Page 1934 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 24 Intake Air Temp. Sensor Circuit
CIRCUIT DESCRIPTION
The intake air temp. sensor is built into the volume air flow meter and senses the intake air temperature.
The structure of the sensor and co

Page 1935 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±404)
(1) Connect SST (check harness ªAº).
(See page
EG±404)
SST 09990±01000
(2) Turn ignition switch ON.
Measure voltage between terminals THW and E2 of en-
gine control module conn

Page 1936 of 2543

TOYOTA SUPRA 1995 Service Repair Manual CIRCUIT DESCRIPTION
See page EG±419 for the circuit description
DTC No.Diagnostic Trouble Code Detecting ConditionTrouble Area
(1) (Main heated*1) oxygen sensor voltage is
0.45 V or less (lean) for 9

CIRCUIT DESCRIPTION
See page EG±419 for the circuit description
DTC No.Diagnostic Trouble Code Detecting ConditionTrouble Area
(1) (Main heated*1) oxygen sensor voltage is
0.45 V or less (lean) for 90 sec. under codi±
tions (a) and (b):
(2 trip detection logic)*
2
(a) Engine coolant temp.: 70°C (158°F)
or more
(b) Engine speed: 1,500 rpm or more
(2)*1Difference of air±fuel ratio feedback
compensation value between front (No.
1 ~ 3 cylinders) and rear (No. 4 ~ 6
cylinders) is more than 15 percentage for
20 sec. or more under conditions (a)
and (b):
(2 trip detection logic)*
2
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(1)*1Difference of air±fuel ratio feedback
compensation value between front (No.
1 ~ 3 cylinders) and rear (No. 4 ~ 6
cylinders) is more than 15 percentage for
20 sec. or more under conditions (a)
and (b):
(2 trip detection logic)*
2
(a) Engine speed: 2,000 rpm or more
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(3)*1Engine speed varies by more than 15 rpm
over the preceding crank angle period
during a period of 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine speed: Idling
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
(2) Engine speed varies by more than 15 rpm
over the preceding crank angle period
during a period of 20 sec. or more under
conditions (a) and (b):
(2 trip detection logic)*
2
(a) Engine speed: Idling
(b) Engine coolant temp.: Between 60°C
(140°F) and 95°C (203°F)
*1: Only for California specification vehicles
*
2: See page EG±397.
Open or short in (main heated*1) oxygen
sensor circuit
(Main heated*
1) oxygen sensor
Ignition system
ECM
Open and short in injector circuit
Fuel line pressure (injector leak, blockage)
Mechanical system malfunction
(skipping teeth of timing belt)
Ignition system
Compression pressure (foreign object caught
in valve)
Volume air flow meter (air intake)
ECM
Open and short in injector circuit
Fuel line pressure (injector leak, blockage)
Mechanical system malfunction
(skipping teeth of timing belt)
Ignition system
Compression pressure (foreign object caught
in valve)
Volume air flow meter (air intake)
ECM
Open and short in injector circuit
Fuel line pressure (injector leak, blockage)
Mechanical system malfunction
(skipping teeth of timing belt)
Ignition system
Compression pressure (foreign object caught
in valve)
Volume air flow meter (air intake)
ECM
Open and short in injector circuit
Fuel line pressure (injector leak, blockage)
Mechanical system malfunction
(skipping teeth of timing belt)
Ignition system
Compression pressure (foreign object caught
in valve)
Volume air flow meter (air intake)
ECM
DTC 25 26 Air±Fuel Ratio Lean Rich Malfunction
EG±428± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

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