1995 TOYOTA SUPRA Service Repair Manual

jack points TPMS reset trunk release seats air condition lane assist

Page 2009 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC
No.
Number of
MIL BlinksCircuitDiagnostic Trouble Code Detecting Condition
(a) Engine coolant temp.: 60°C (140°F) or more
(2 trip dectection logic)*3
(2 trip dectection logic)*3
(2 trip dectecti

Page 2010 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Malfunction detection (1st time)
(temporarily recorded)Malfunction detection (2nd time)
(MIL lights up)

Trouble Are

Malfunction detection (1st time)
(temporarily recorded)Malfunction detection (2nd time)
(MIL lights up)

Trouble Area

Malfunction
Indicator
Lamp*
1

Memory*2

See page

Trouble Area

Normal
Mode

Test
Mode

Memory

See page

Open in EGR gas temp. sensor circuit
Short in VSV circuit for EGR
EGR hose disconnected, valve stuck
Clogged EGR gas passage
ECM

ON

ON

EG±564

Open or short in fuel pump ECU circuit
Fuel pump ECU
Fuel pump
ECM power source circuit
ECM

OFF

ON

EG±568

A/C switch circuit
Throttle position sensor IDL circuit
Park/neutral position switch circuit
Accelerator pedal and cable
ECM

N.A.

OFF

X

EG±571
*3: This indicates items for which º2 trip detection logicº is used. With this logic, when a logic malfunction is
first detected, the malfunction is temporarily stored in the ECM memory. If the same case is detected again
during the second drive test, this second detection causes the Malfunction Indicator Lamp to light up.
The 2 trip repeats the same mode a 2nd time. (However, the IG switch must be turned OFF between the
1st trip and 2nd trip).
In the Test Mode, the Malfunction Indicator Lamp lights up the 1st trip a malfunction is detected.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±503

Page 2011 of 2543

TOYOTA SUPRA 1995 Service Repair Manual FAIL±SAFE CHART
If any of the following codes is detected, the ECM enters fail±safe mode.
DTC No. Fail±Safe Operation Fa

FAIL±SAFE CHART
If any of the following codes is detected, the ECM enters fail±safe mode.
DTC No. Fail±Safe Operation Fail±Safe Deactivation Conditions

14

Fuel cut

6 IGF signals detected in 6 consecutive
ignitions
16 Torque control prohibited Returned to normal condition
22

THW is fixed at 80°C (176°F)

Returned to normal condition
24 THA is fixed at 20°C (68°F) Returned to normal condition

31

Volume of air flowing is measured by turbo pressure
Sensor to determine injection volume and ignition
Timing

Returned to normal condition

34

Fuel cut

Returned to normal condition
Turbo

Turbo
Pressure Fuel cut Returned to normal condition
35 Sensor

35

BARO
Sensor

Atmospheric pressure is fixed at
101.3 kPa (760 mmHg, 29.92 inVHg)
Returned to normal condition

41

VTA1 is fixed at closed throttle position

The following must each be repeated at
least 2 times consecutively:
0.1 V VTA1 0.95 V
IDL: ON

47

VTA2 is fixed at wide open throttle
Position

The following must be repeated at least 2
times consecutively
0.1 V VTA2 0.95 V
52 Max. timing retardation IG switch OFF
53 Max. timing retardation Returned to normal condition
55 Max. timing retardation IG switch OFF
Back±Up Function
If there is trouble with the program in the ECM and the ignition signals (IGT) are not output from the microcomput-
er, the ECM controls fuel injection and ignition timing at predetermined levels as a back±up function to make
it possible to continue to operate the vehicle.
Furthermore, the injection duration is calculated from the starting signal (STA) and the throttle position signal
(IDL). Also, the ignition timing is fixed at the initial ignition timing, 10
°BTDC, without relation to the engine speed.
HINT: If the engine is controlled by the back±up function, the malfunction indicator lamp lights up to warn the
driver of the malfunction but the diagnostic trouble code is not output. EG±504
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

Page 2012 of 2543

TOYOTA SUPRA 1995 Service Repair Manual G, NE signal circuit (No.2)
Engine coolant temp. sensor
circuit
Intake air temp. sensor circuit
Throttle position sensor
circuit
Sub±throttle position sensor
circuit
CircuitDTC
CHECK FOR INTERMITTENT

G, NE signal circuit (No.2)
Engine coolant temp. sensor
circuit
Intake air temp. sensor circuit
Throttle position sensor
circuit
Sub±throttle position sensor
circuit
CircuitDTC
CHECK FOR INTERMITTENT PROBLEMS
As described in the preceding paragraph, abnormality detection
ability in the test mode is increased compared to that in the normal
mode, so that when intermittent problems occur in the ECM signal
circuits (G1, G2, NE, THW, THA, VTA1, VTA2) shown in the table
below, the appropriate diagnostic trouble code is output.
Accordingly, when the diagnostic trouble codes shown in the table
opposite (13, 22, 24, 41, 47) are output during the diagnostic
trouble code check, and inspection of the appropriate circuits re-
veals no abnormality, check for intermittent problems as described
below.
By checking for intermittent problems, the place where intermittent
problems are occurring due to poor contacts can be isolated.
CLEAR DIAGNOSTIC TROUBLE CODES
See page EG±493.
SET TEST MODE
1. With the ignition switch OFF, using SST, connect the
terminals TE2 and E1 of the data link connector 2.
SST 09843±18020
2. Start the engine and check to see the malfunction indicator
lamp goes off.
PERFORM A SIMULATION TEST
Using the symptom simulation (See page IN±24), apply vibration
to and pull lightly on the wire harness, connector or terminals in the
circuit indicated by the malfunction code.
In this test, if the malfunction indicator lamp lights up, it indicates
that the place where the wire harness, connector or terminals be-
ing pulled or vibrated has faulty contact. Check that point for loose
connections, dirt on the terminals, poor fit or other problems and
repair as necessary.
HINT: After cancelling out the diagnostic trouble code in memory
and set the test mode, if the malfunction indicator lamp does not
go off after the engine is started, check thoroughly for faulty con-
tacts, etc., then try the check again, if the malfunction indicator
lamp still does not go off, check and replace ECM.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±505

Page 2013 of 2543

TOYOTA SUPRA 1995 Service Repair Manual BASIC INSPECTION
In many cases, by carrying out the basic engine check shown in the following flow chart, the location causing
the problem can be found quickly and efficiently. Therefore, use of this

Page 2014 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±20)
Check idle speed.
Proceed to matrix chart of problem symp-
toms on page EG±514.
(1) Shift transmission into ªNº position.
(2) Warm up engine to normal operating tempera±
ture.
(3

Page 2015 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page
IG±26)
Check fuel pressure.
Proceed to page EG±264 and continue to
troubleshoot.
(1) Be sure that there is enough fuel in the tank.
(2) Turn ignition switch ON.
(3) Using SST, connect term

Page 2016 of 2543

TOYOTA SUPRA 1995 Service Repair Manual PARTS LOCATION
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±509

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