1995 TOYOTA SUPRA Service Repair Manual

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Page 1897 of 2543

TOYOTA SUPRA 1995 Service Repair Manual If a malfunction code is displayed during the diagnostic trouble code check in test mode, check the circuit for
that code listed in the table below (Proceed to the page given for that circuit).
EG±40

Page 1898 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC
No.Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
Engine Coolant
Temp. Sensor
Circuit
Intake Air Temp.
Sensor Signal
Air±Fuel Ratio
Lean Malfunction
Open or short in engin

Page 1899 of 2543

TOYOTA SUPRA 1995 Service Repair Manual

Trouble Area

Malfunction
Indicator
Lamp*
1

Memor

Trouble Area

Malfunction
Indicator
Lamp*
1

Memory*2

See page

Trouble Area

Normal
Mode

Test
Mode

Memory

See page

Open or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM

ON

ON

EG±424

Open or short in intake air temp. sensor circuit
Intake air temp. sensor
ECM

ON

ON

EG±426

Open or short in (main heated*3) oxygen sensor circuit
(Main heated*3) oxygen sensor
Ignition system
ECM

Open or 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

ON

ON

EG±428

Open or 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

*1, 2, 3: See page EG±396.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±391

Page 1900 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC
No.Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
Air±Fuel Ratio
Rich Malfunction
(1) Difference of air±fuel ratio feedback compensation value
between front (No.1 ~ 3 cyl

Page 1901 of 2543

Trouble Area

Malfunction
Indicator
Lamp*
1

Memory*2

See page

Trouble Area

Normal
Mode

Test
Mode

Memory

See page

Open or 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

ON

ON

EG±428

Open or 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

ON

ON

EG 428

Open or short in heater circuit of sub heated oxygen sensor
Sub heated oxygen sensor
ECM

ON

N.A.

Open or short in sub heated oxygen sensor circuit
Sub heated oxygen sensor
ECM

ON

ON

EG±434

Open or short in heater circuit of main heated oxygen sensor (Rr)
Main heated oxygen sensor (Rr) heater
ECM

ON

N.A.

(Main heated*3) oxygen sensor (Rr) circuit
(Main heated*3) oxygen sensor (Rr)

ON

ON

EG±419
*1, 2, 3: See page EG±396.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±393

Page 1902 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC
No.Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
Volume Air
Flow Meter
Signal
Barometric
Pressure
Sensor Signal
Throttle Position
Sensor Signal
No.1 Vehicle
Speed Sensor
S

Page 1903 of 2543

Trouble Area

Malfunction
Indicator
Lamp*
1

Memory*2

See page

Trouble Area

Normal
Mode

Test
Mode

Memory

See page

Open or short in volume air flow meter circuit
Volume air flow meter
ECM

ON

N.A.

EG±438

ECM

ON

ON

EG±441

Open or short in throttle position sensor circuit
Throttle position sensor
ECM

ON

ON

EG±442

No.1 vehicle speed sensor
Telltale light RH
Open or short in No.1 vehicle speed sensor circuit
ECM

OFF

OFF

EG±445

Open or short in starter signal circuit
Open or short in ignition switch or starter relay circuit
ECM

N.A.

OFF

X

EG±448

Open or short in No.1 knock sensor circuit
No.1 knock sensor (looseness)
ECM

ON

N.A.

EG±450

ECM

ON

N.A.

X

EG±450

Open or short in No.2 knock sensor circuit
No.2 knock sensor (looseness)
ECM

ON

N.A.

EG±450
*1, 2: See page EG±396.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±395

Page 1904 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC
No.Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
EGR System
Malfunction
Fuel Pump
Control Signal
Switch Condition
Signal
(1) 3 sec. or more after engine starts, with close

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