1995 TOYOTA SUPRA Service Repair Manual

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Page 1913 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±439)
(See page EG±472)
(See page EG±415)
(See page EG±415)
(See page EG±410)
(See page EG±410)
Symbols (Terminals No.)STD Voltage (V)Condition
Always
IG switch ON
IG switch ON and a

Page 1914 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Symbols (Terminals No.) STD Voltage (V) Condition
ACIS (B39)±E01 (B80) 9 ~ 14

Symbols (Terminals No.) STD Voltage (V) Condition
ACIS (B39)±E01 (B80) 9 ~ 14 IG switch ON
EVAP (B74)±E01 (B80) 9 ~ 14 IG switch ON
EGR (B75) E01 (B80)

Below 2.0

Idling
EGR (B75)±E01 (B80) 9 ~ 14 Engine speed at 3,500 rpm

ISC1 (B35), ISC2 (B34)
±E01 (B80)
ISC3 (B33), ISC4 (B32)
Pulse generation
(See page EG±475)
Idling, when A/C switch ON or OFF

VF1 (B29), VF2 (B28)±E1 (B69)

1.8 ~ 3.2

Maintain engine speed at 2,500 rpm for 2
minutes after warming up then return to
Idling

OX1 (B48), OX2 (B47)±E1 (B69)
OX3 (A30)*
Pulse generation
(See page EG±423)
Maintain engine speed at 2,500 rpm for 2
minutes after warming up

HT1 (B73)*, HT2 (B72)*±E01 (B80)

Below 3.0

Idling

HT1 (B73) , HT2 (B72) E01 (B80)
HT3 (A36)* 9 ~ 14 IG switch ON

KNK1 (B50), KNK2 (B49)±E1 (B69)

Pulse generation
(See page EG±452)
Idling

NSW (B76) E1 (B69)

9 ~ 14

IG switch ON
Other shift position in ºPº, ºNº position

NSW (B76)±E1 (B69)
0 ~ 3.0

IG switch ON
Shift position in ºPº, ºNº position

SP1 (A2)±E1 (B69)

Pulse generation
(See page EG±445)
IG switch ON
Rotate driving wheel slowly

TE1 (A20)±E1 (B69)

9 ~ 14

IG switch ON
TE2 (A19)±E1 (B69) 9 ~ 14 IG switch ON

W (A6) E1 (B69)
9 ~ 14 Idling
W (A6)±E1 (B69) 0 ~ 3.0 IG switch ON
OD1 (A12)±E1 (B69)
9 ~ 14
IG switch ON
A/C (A34) E1 (B69) 7.5 ~ 14 A/C switch OFF
A/C (A34)±E1 (B69) 0 ~ 1.5 A/C switch ON (At idling)

ACMG (A23) E1 (B69)
0 ~ 3.0 A/C switch ON (At idling)

ACMG (A23)±E1 (B69)
9 ~ 14
A/C switch OFF
FPU (B36)*E01 (B80) 9 ~ 14 IG switch ON
FPU (B36)*±E01 (B80) Below 2.0 Restarting at high engine coolant temp.

ELS (A15) E1 (B69)
7.5 ~ 14 Defogger switch and taillight switch ON

ELS (A15)±E1 (B69)
0 ~ 1.5
Defogger switch and taillight switch OFF
*: Only for California specification vehicles EG±406
± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

Page 1915 of 2543

TOYOTA SUPRA 1995 Service Repair Manual REFERENCE VALUE OF ECM DATA
HINT: ECM data can be monitored by TOYOTA hand±held
tester.
1. Hook up the TOYOTA hand±held tester to DLC2.
2. Monitor ECM data by following the prompts on the tester
s

REFERENCE VALUE OF ECM DATA
HINT: ECM data can be monitored by TOYOTA hand±held
tester.
1. Hook up the TOYOTA hand±held tester to DLC2.
2. Monitor ECM data by following the prompts on the tester
screen.
Please refer to the TOYOTA hand±held tester operator's manual
for further details.
REFERENCE VALUE
Item Inspection condition Reference value

INJECTOR

Engine cold to hot
Engine idling at normal operating temp.*1

Gradually decreases
Approx. 2.0 msec.
IGNITION Increase engine speed Gradually increases

IAC STEP #

Engine idling at normal operating temp.*1
A/C switch ON
A/T shifting in ºDº position
Ignition switch ON (Engine off)

20 ~ 25 steps
Step increases
Step increases
Approx. 125 steps
ENGINE SPEED RPM kept stable (Comparison with tachometer) No great changes
VA F

Engine idling at normal operating temp.*1
Increase engine speed

Approx. 35 ms
Gradually decreases
ECT Engine at normal operating temp. 75±95°C (185±203°F)*2

THROTTLE

Closed throttle position
Wide open throttle
From closed throttle position to wide open throttle

Below 5°
Above 70°
Gradually increases

VEHICLE SPD

During driving
(Comparison with speedometer)
No large differences
TARGET A/FL*5 Engine idling at normal operating temp. 2.50 + 1.25 V*3
TARGET A/FR*6 Engine idling at normal operating temp. 2.50 + 1.25 V*3
A/F FB LEFT*5 RPM stable at 2500 rpm with normal operating temp. ON
A/F FB RIGHT*6 RPM stable at 2500 rpm with normal operating temp. ON
KNOCK FB Depress throttle pedal suddenly during idling ON
STA SIGNAL During cranking ON
CTP SIGNAL Closed throttle position ON
A/C SIGNAL A/C switch ON ON
PNP SIGNAL*4 When shifting from ºPº or ºNº position into a position
other than ºPº or ºNº GEAR
O X L*5 RPM stable at 2500 rpm with normal operating temp. RICH LEAN is repeated O X R*6 RPM stable at 2500 rpm with normal operating temp. RICH LEAN is repeated
*1: If the engine coolant temp. sensor circuit is open or shorted, the ECM assumes an engine coolant temp.
value of 80
°C (176°F).
*
2: When feedback control is forbidden, 0 V is displayed.
*
3: A/T only
*
4: Oxygen sensor (Front)
*
5: Oxygen sensor (Rear)
± ENGINE2JZ±GE ENGINE TROUBLESHOOTINGEG±407

Page 1916 of 2543

TOYOTA SUPRA 1995 Service Repair Manual MATRIX CHART OF PROBLEM SYMPTOMS
When the malfunction code is not confirmed in the diagnostic trouble code check and the problem still can not
be confirmed in the basic inspection, proceed to this mat

Page 1917 of 2543

TOYOTA SUPRA 1995 Service Repair Manual CIRCUIT INSPECTION
DTC 12 G NE Signal Circuit (No.1)
CIRCUIT DESCRIPTION
The distributor in the Engine Control System contains 3 pick±up coils (G1, G2 and NE).
The G1, G2 signals inform the ECM of th

Page 1918 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE
Check resistance of each pickup coils in distributor.
INSPECTION USING OSCILLOSCOPE
Replace Distributor
Repair or replace harness or connector
Check for open and short in harness

Page 1919 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Check air gap.
Remove distributor cap & rotor.
Using SST (G1 and G2 pickups) and a thickness gauge
(NE pickup), measure the air gap between the signal ro-
tor and pickup coil projection.
SST 09240±00

Page 1920 of 2543

TOYOTA SUPRA 1995 Service Repair Manual DTC 13 G NE Signal Circuit (No.2)
CIRCUIT DESCRIPTION
See G, NE signal circuit (No. 1) on page EG±409.
DTC No. Diagnostic Trouble Code Detecting Condition

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