1995 TOYOTA SUPRA Service Repair Manual

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Page 1905 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 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±453

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

OFF

ON

EG±457

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

N.A.

OFF

X

EG±460
*4: 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±GE ENGINE TROUBLESHOOTINGEG±397

Page 1906 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 1 IGF detected in 3 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

Ignition timing fixed at 10°BTDC
Injection time fixed:
(Starting....9 msec.
(IDL ON....3.6 msec.
(IDL OFF....6.7 msec.

KS input 15 times/sec. or more

35

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

41

VTA1 is fixed at 0°

The following must each be repeated at least 2
Times consecutively:
0.25 V VTA 0.95 V
IDL: ON
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±398
± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

Page 1907 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTCCircuit
G, NE signal circuit (No.2)
Engine coolant temp. sensor
circuit
Intake air temp. sensor circuit
Throttle position sensor
circuit
CHECK FOR INTERMITTENT PROBLEMS
As described in the precedin

DTCCircuit
G, NE signal circuit (No.2)
Engine coolant temp. sensor
circuit
Intake air temp. sensor circuit
Throttle position sensor
circuit
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) 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) are output during the diagnostic trouble
code check, and inspection of the appropriate circuits reveals 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±387.
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 indi-
cates that the place where the wire harness, connector or ter-
minals being pulled or vibrated has a 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 thor-
oughly for faulty contacts, etc., then try the check again. If the
malfunction indicator lamp still does not go off, check and re-
place ECM.
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±399

Page 1908 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 1909 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Check idle speed.
Check ignition timing.
Check idle speed.
(1) Shift transmission into ªNº position.
(2) Warm up engine to normal operating tempera±
ture.
(3) Switch OFF all accessories.
(4) Switch

Page 1910 of 2543

TOYOTA SUPRA 1995 Service Repair Manual EG±193
IG±4
EG±408.
(1) Be sure that there is enough fuel in the tank.
(2) Turn ignitiion switch ON.
(3) Using SST, connect terminals FP and +B of data
link connector 1.
SST 09834±18020
Check that

Page 1911 of 2543

TOYOTA SUPRA 1995 Service Repair Manual PARTS LOCATION
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±403

Page 1912 of 2543

TOYOTA SUPRA 1995 Service Repair Manual STANDARD VALUE OF ECM TERMINALS
Connectors of the engine control module are waterproof and are
the bolt type.
For waterproof type connectors, in order to measure the voltage
of ECM terminals and the

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