transmission TOYOTA SUPRA 1995 Service Repair Manual

DTC 51 Switch Condition Signal Circuit
CIRCUIT DESCRIPTION
Park/Neutral Position Switch
The ECM uses the signals from the park/neutral position switch to determine whether the transmission is in park
or neutral, or in some other position.
Air Conditioning Switch Signal
The ECM uses the output from the air conditioning switch to determine whether or not the air conditioning is
operating so that it can increase the idling speed of the engine if necessary.
Throttle Position Sensor IDL Signal
The IDL contacts are mounted in the throttle position sensor, and detects the idle condition.
 DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area
 
 
 
 
(1) 3 sec. or more after engine starts with
closed throttle position switch OFF
(IDL1)
 
 
Throttle position sensor IDL circuit
Alt dldbl 
 51
 
 
(IDL1)
(2) Park/neutral position switch: OFF
(Shiftposition inºRººDºº2ºorºLº
 
 

Accelerator pedal and cable

Park/neutral position switch

A/C switch circuit 
 
 
 
(Shift position in ºRº, ºDº, º2º or ºLº
position.)
(3) A/C switch ON 
 

A/C switch circuit

ECM
HINT: In this circuit, diagnoses can only be made in the test mode.
EG±460± ENGINE2JZ±GE ENGINE TROUBLESHOOTING

Diagnosis Inspection (Test Mode)
Compared to the normal mode, the test mode has an in-
creased sensing ability to detect malfunctions.
It can also detect malfunctions in the starter signal circuit, the
IDL contact signal of the throttle position sensor, air condi-
tioning signal and park/neutral position switch signal.
Furthermore, the same diagnostic items which are detected
in the normal mode can also be detected in the test mode.
DIAGNOSTIC TROUBLE CODE CHECK
1. Initial conditions.
(a) Battery voltage 11 V or more
(b) Throttle valve fully closed
(c) Transmission in neutral position
(d) Air conditioning switched OFF
2. Turn ignition switch OFF
3. Using SST, connect terminals TE2 and E1 of the data link
connector 2.
SST 09843±18020
4. Turn ignition switch ON.
HINT:
wTo confirm that the test mode is operating, check that the
malfunction indicator lamp flashes when the ignition
switch is turned to ON.
wIf the malfunction indicator lamp does not flash, proceed
to troubleshooting of the TE2 terminal circuit on page
EG±598.
5. Start the engine.
6. Simulate the conditions of the malfunction described by the
customer.
7. After the road test, using SST, connect terminals TE1 and E1
of the data link connector 2.
SST 09843±18020
8. Read the diagnostic trouble code on malfunction indicator
lamp on the telltale light RH (See page EG±491).
9. After completing the check, disconnect terminals TE1, TE2
and E1, and turn off the display.
HINT:
wThe test mode will not start if terminals TE2 and E1 are
connected after the ignition switch is turned ON.
wWhen the engine is not cranked, diagnostic trouble
codes º43º (Starter signal) output, but this is not
abnormal.
wWhen the automatic transmission shift lever is in the ºDº,
º2º, ºLº or ºRº shift position, or when the air conditioning
is on or when the accelerator pedal is depressed, code
º51º (Switch condition signal) is output, but this is not
abnormal. EG±492
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

(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) Switch OFF all accessories.
(4) Switch OFF air conditioning.
(5) Connect tachometer test probe to terminal
IG of data link connector 1.
Check Idle speed.
Idle speed: 650  50 rpm

Never allow tachometer test probe to touch
ground as it could result in damage to igniter
and/or ignition coil.

As some tachometers are not compatible
with this ignition system, we recommended
that you confirm the compatibility of your
unit before use.
Check ignition timing.
(1) Shift transmission into ªNº position.
(2) Warm up engine to normal operating tempera±
ture.
(3) Keep the engine speed at idle.
(4) Using SST, connect terminals TE1 and E1 of
data link connector 1.
SST 09843±18020
(5) Connect a timing light clip to the check wire.
(See page EG±20)
Check ignition timing.
Ignition timing: 10 2° BTDC @ idle
Proceed to matrix chart of problem symp-
toms on page EG±514.
Proceed to page EG±518 and continue to
troubleshoot.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±507

DTC 16 A T Control Signal Malfunction
CIRCUIT DESCRIPTION
The signal from the A/T CPU retards the ignition timing of the engine during A/T gear shifting, thus momentarily
reducing torque output of the engine for smooth clutch operation inside the transmission and reduced shift
shock.
 
 DTC No.
 
 Diagnostic Trouble Code Detecting Condition
 
 Trouble Area
 
 16
 
 
Fault in communications between the engine
CPU and A/T CPU in the ECM 
 
ECM
If the ECM detects the diagnostic trouble code º16º in memory, it prohibits the torque control of the A/T which
performs smooth gear shifting.
INSPECTION PROCEDURE
Are there any other codes (besides Code 16) being output?
Go to relevant diagnostic trouble code chart.
Replace engine control module.
EG±524± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

DTC 42 No. 1 Vehicle Speed Sensor Signal Circuit
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4±pulse signal for every revolution of the rotor shaft, which
is rotated by the transmission output shaft via the driven gear. After this signal is converted into a more
precise rectangular waveform by the waveform shaping circuit inside the odometer and trip meter, it is
then transmitted to the engine control module. The ECM determines the vehicle speed based on the
frequency of these pulse signals.
DTC No.Diagnostic Trouble Code Detecting ConditionTrouble Area
For A/T
All conditions below are detected
Continuously for 8 sec. or more:
(a) No.1 vehicle speed signal: 0 km/h
(mph)
(b) Engine speed: 3,000 rpm or more
(c) Park/neutral position switch: OFF
(d) Stop light switch: OFF
For A/T
All conditions below are detected
Continuously for 8 sec. or more:
(a) No.1 vehicle speed signal: 0 km/h
(mph)
(b) Engine speed: Between 1,500 rpm
and 4,000 rpm
(c) Engine coolant temp.: 80°C (176°F)
or more
(d) Load driving

No.1 vehicle speed sensor

Telltale light RH (Odometer and trip meter)

Open or short in No.1 vehicle speed sensor
circuit

ECM
HINT: In test mode, diagnostic trouble code 42 is output when vehicle speed is 5 km/h (3 mph) or
below.

Waveform between terminals SP1 and E1 when vehicle
speed is approx. 20 km/h (12mph).
HINT: As the vehicle speed increases, the number of signals
from SP1 increases. EG±556
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTING

Malfunction: Open in EGR Gas Temp. Sensor Circuit
(1) Disconnect the EFI No.1 fuse (30A) for 10 sec. or more, with IG switch OFF.
Initiate test mode (Connect terminal TE2 and E1 of data link connector 2 with IG
switch OFF).
(2) Start the engine and warm up.
(3) Idle the engine for 3 min.
(4) With the A/C ON and transmission in 5th position (A/T in 3rd speed) drive at 88 96
km/h (55 60 mph) for 4 min or less.
HINT: If a malfunction exists, the malfunction indicator lamp will light up during step (4).
NOTICE: If the conditions in this test are not strictly followed, detection of the malfunction
will not be possible.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±565

DTC 51 Switch Condition Signal Circuit
CIRCUIT DESCRIPTION
Park/Neutral Position Switch
The ECM uses the signals from the park/neutral position switch to determine whether the transmission is in park
or neutral, or in some other position.
Air Conditioning Switch Signal
The ECM uses the output from the air conditioning switch to determine whether or not the air conditioning is
operating so that it can increase the idling speed of the engine if necessary.
Throttle Position Sensor IDL Signal
The IDL contacts are mounted in the throttle position sensor, and detects the idle condition.
 DTC No. Diagnostic Trouble Code Detecting Condition Trouble Area
 
 
 
 
 
 
51
 
 
 
 
 
 
(1) 3 sec. or more after engine starts with
closed throttle position switch OFF
(IDL1)
(2) Park/neutral position switch: OFF
(Shift position in ºRº, ºDº, º2º or º1º
position.)
(3) A/C switch ON 
 
 
 
 
 

Throttle position sensor IDL circuit

Accelerator pedal and cable

Park/neutral position switch

A/C switch circuit

ECM
HINT: In this circuit, diagnosis can only be made in the test mode.
± ENGINE2JZ±GTE ENGINE TROUBLESHOOTINGEG±571

SERVICE SPECIFICATIONS
SERVICE DATA
 
 
 
Turbocharger 
 
 
Turbocharging pressure
Impeller wheel axial play Limit
Impeller wheel radial play Limit 
 
 
61±75 kPa (0.62±0.76 kgf/cm2, 8.8±10.8 psi)
0.162 mm (0.0064 in.)
0.110 mm (0.0045 in.)
TORQUE SPECIFICATIONS
 
 Part tightened 
 NVm 
 kgfVcm 
 ftVlbf
 Turbocharger x Turbine outlet elbow 25 250 18
 Turbo water pipe x Turbocharger 8.8 90 78 in.Vlbf
 Side bearing housing plate x Turbocharger 8.8 90 78 in.Vlbf
 No.2 air tube x No.2 turbocharger 21 210 15 
 Turbocharger x Exhaust manifold
 
 54
 
 550
 
 40
 Turbo oil pipe x Turbocharger 21 210 15
 Turbo oil pipe x Cylinder block 39 400 29
 Turbocharger stay x Turbocharger 43 440 32 
 Turbocharger stay x Cylinder block
 
 43
 
 440
 
 32
 Exhaust gas control valve x Turbine outlet elbow 69 700 51
 Main heated oxygen sensor x Exhaust gas control valve 20 200 14
 Exhaust gas control valve stay x Exhaust gas control valve 43 440 32 
 Exhaust gas control valve stay x Cylinder block
 
 43
 
 440
 
 32
 Exhaust bypass pipe x Turbine outlet elbow 25 250 18
 Exhaust bypass pipe x Exhaust gas control valve 25 250 18
 Intake air control valve x No.2 turbocharger 21 210 15 
No.4 air tube x No.1 turbocharger 
21 
210 
15 
 No.1 air tube x No.1 turbocharger
 
 21
 
 210
 
 15
 No.2 front exhaust pipe x Exhaust gas control valve 62 630 46
 Front exhaust pipe x No.2 front exhaust pipe 58 590 43
 Pipe support bracket x Transmission 43 440 32 
 
 
Upper front crossmember extension x Front suspension Bolt
Nut
 
 
 
29
33
 
 
 
300
340
 
 
 
22
25
 
 
Front lower arm bracket stay x Front suspension Bolt
Nut 
 
44
59 
 
450
600 
 
33
43
 CAC duct x CAC 4.9 50 43 in.Vlbf
 CAC x Body 13 135 10
EG±162± ENGINETURBOCHARGER SYSTEM (2JZ±GTE)