TOYOTA SUPRA 1995 Service Repair Manual

 Trouble Area O/D OFF Indicator
Light *1Blinks
 Memory *2 See
Page Trouble Area Light *1 Blinks Memory  Page
 
 
 
 
 

Harness or connector between O/D direct clutch speed sensor
and ECM

O/D direct clutch speed sensor

ECM
 
 
 
 
 

 
 
 
 
 

 
 
 
 
 
AT2±89
 
 
 
 
 
 

Harness or connector between No.5 solenoid valve and

ECM

No.5 solenoid valve

ECM
 
 
 
 
 
 

 
 
 
 
 
 

 
 
 
 
 
 
AT2±92
 
 
 
 
 
 

Harness or connector between TRAC ECU and ECM.

TRAC ECU
 
 
 
 
 
 

 
 
 
 
 
 

 
 
 
 
 
 
AT2±95
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±57

*1: ºOº mark means ºO/D OFFº light blinks once every 2 seconds.
ºXº mark means ºO/D OFFº light never blinks.
*2: ºOº marks means the ECM memorizes the malfunction code if the ECM detects the diagnostic trouble code
detection condition.
*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 O/D OFF indicator light to blink. The 2 trip
repeats the same mode twice. (However, the IG switch must be turned OFF between the 1st trip and 2nd
trip.)
HINT:
wIf the malfunction returns to normal while a malfunction warning is being output, the O/D OFF indicator
light stops blinking and goes off.
However, the diagnostic trouble code is retained in memory until it is cleared from memory.
wIf the diagnosis system outputs a diagnostic trouble code even though the O/D OFF indicator was not
blinking, there is intermittent trouble. Check all the connections in the circuits corresponding to that
code.
wCodes 42, 62, 63 and 64 are limited to short or open circuits in the electrical system comprised of the
solenoids, wire harnesses, and connectors. The ECM is unable to detect mechanical trouble (sticking,
for example) in the solenoid valves.
wIf the speed sensors No.1 and No.2 happen to fail simultaneously, the ECM will neither alert the driver
by blinking the O/D OFF indicator nor record any diagnostic trouble code. It will, however, decide that
the vehicle can be driven only in 1st and none of the other gears, shifting upward will then be
prohibited. AT2±58
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

Memo
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±59

STANDARD VALUE OF ECM TERMINAL
(*A= (E10), B= (E9))
 Terminals Symbols Wiring
Color Condition Standard
Value
 B13 ± B69 SLN±E1 Y±G eBR Ignition switch ON 10 ± 14 V B14 ± B69 SLU±E1 LG±B eBR Ignition switch ON 10 ± 14 V
     Shift Lever: P or N position Below 1 V
 B76 ± B69 NSW±E1 B±W eBR IG ON Shift Lever: Other than
P or N position 10 ± 14 V
 B1 ± B21 NCO±NCO L eY IG OFF, Disconnect ECM connector 560 ± 680
 B3 ± B23 SP2±SP2 G e R IG OFF 560 ± 680

    IG OFF 10 ± 16

 B10 ± B69 S1 ± E1 WR eBR Vehicle driving in 2nd gear position 10 ± 14 V

B10 B69

S1 E1

WR eBR
IG ON10 ± 14 V    IG OFF 10 ± 16
 B9 ± B69 S2 ± E1 RL eBR Vehicle driving in 2nd or 3rd position 10 ± 14 V
 B9 B69 S2 E1 RL eBR IG ON Below 0.5 V
Accel Pedal is not depressedBelow 1 5 V B43 ± B65 VTA1 ± E2 YeBR IG ON Accel. Pedal is not depressed Below 1.5 V
 B43 ± B65 VTA1 ± E2 Y eBR IG ON Accel. Pedal is fully depressed 3.0 ± 5.5 V
IDL1 E2Accel Pedal is not depressedBelow 1 VB64 B65IDL1 ± E2ReBRIG ONAccel. Pedal is not depressedBelow 1 V B64 ± B65 IDL1 E2 R eBR IG ON Accel. Pedal is depressed 10 ± 14 V 
 A2 ± B65
 
 SP1 ± E2
 
 P eBR
 
 Ignition switch ON
turn one rear wheel slowly 
 Repeat 0±8 V
or above
 
 A3 ± B69
 
 KD±E1
 
 YeBR
 
 IG ON
 
 
Kickdown SW: OFF
(Accel. pedal is not depressed) 
 10 ± 14 V
 
 
A3 ± B69 
 
KD ± E1 
 
Y eBR 
 
IG ON 
 
Kickdown SW: ON
(Accel. pedal is fully depressed) 
 Below 0.5 V
Shift position: R position10 ± 14 V 
 A7 ± B69 
 R ± E1 
 RB eBR 
 IG ON 
 Shift position: Other than R
position 
 Below 0.5 V
     Shift position: 2 position 10 ± 14 V
 
 
A9 ± B69 
 
2 ± E1 
 
LG±R eBR 
 
IG ON 
 
Shift position: Other than 2
position 
 Below 0.5 V
Shift position: L position10 ± 14 V 
 A10 ± B69 
 L ± E1 
 G±B eBR 
 IG ON 
 Shift position: Other than L
position 
 Below 0.5 V
 A12 ± B69 OD1 ± E1 BR±B eBR Ignition switch ON 4 ± 6 V
AT2±60± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

(*A= (E10), B= (E9))
 
 Terminals
 
 Symbols
 
 
Wiring
Color 
 Condition
 
 
Standard
Value
 A14 ± B69 TRC ± E1 O eBR Ignition switch ON 10 ± 14 V
 A13 ± B69 TRC± E1 W±R eBR Ignition switch ON 10 ± 14 V
 B12 ± B31 SLT±SLT LG±R eW±G Ignition switch ON 10 ± 14 V
 
A18 B69
 
ME1
 
GYeBR
 
IG ON
 Pattern select SW: MANU 10 ± 14 V
 A18 ± B69 M ± E1 G±Y eBR IG ON Pattern select SW: NORM Below 1 V 
A28 B69
 
OD2 E1
 
VGeBR
 
IG ON
 O/D main SW: ON 10 ± 14 V A28 ± B69 OD2 ± E1 V±G eBR IG ON O/D main SW: OFF Below 0.5 V A27 ± B69 EFI± E1 BeBR Ignition switch ON 10 ± 14 V A26 ± B69 EFI± E1 W eBR Ignition switch ON 10 ± 14 V
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±61

MATRIX CHART OF PROBLEM SYMPTOMS
If a normal code is displayed during the diagnostic trouble code check but the trouble still occurs, check
the circuits for each symptom in the order given in the charts on the following pages and proceed to the
page given for troubleshooting.
The Matrix Chart is divided into 3 chapters.
Chapter 1: Electronic Circuit Matrix Chart
Chapter 2: On±vehicle Repair Matrix Chart
Chapter 3: Off±vehicle Repair Matrix Chart
When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to Chapter
2 or 3, proceed as instructed.
1. If the instruction ºProceed to next circuit inspection shown on matrix chartº is given in the flow chart for each
circuit, proceed to the circuit with the next highest number in the table to continue the check.
2. If the trouble still occurs even though there are no abnormalities in any of the other circuits, then check or
replace the ECM. AT2±62
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

±Memo±
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±63

Chapter 1. Electronic Circuit
AT2±72AT2±75AT2±79AT2±82AT2±85AT2±89AT2±97
Suspect Area
Symptom
Vehicle does not move in any forward position and reverse
position
No up±shift
No down±shift
No lock±up
Vehicle does not move in particular position or positions
Harsh engagement
No engine braking
1st " 2nd
2nd " 3rd
3rd " O/D
O/D " 3rd
3rd " 2nd
2nd " 1st
N " D
Large shift shock or Engine stalls when starting off or stopping.
*No pattern select
No.1 Vehicle speed
sensor circuit
See Page
No lock±up off
Slip or Shudder
Poor acceleration
No kick±down
Lock±up
Any driving position
Forward and reverse
Any particular position
Shift point too high or too low
Up±shifts to 2nd while in L position
Up±shifts to 3rd while in L position
Up±shifts to O/D from 3rd while O/D switch is OFF
Up±shifts to O/D from 3rd while engine is cold
No.1, No.2 solenoidcircuitNo.2 Vehicle speed
sensor circuitNo.4 solenoid
circuitNo.3 solenoid
circuit(Sub)±throttle
position sensor circuitO/D direct clutch
speed sensor circuit
* The automatic transmission in not shifted into the manual mode when the automatic transmission fluid
temperature is too high. AT2±64
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING

AT2±101AT2±99AT2±103AT2±105AT2±108AT2±111EG±312AT2±60AT2±66AT2±68AT2±92BR±128AT2±70
Park/neutral position
switchPattern select switch
circuitStop light switch
circuitKick±down switch
circuitO/D switch O/D OFF
indicator light circuitEngine coolant temp.
sensor circuitO/D cancel signal
circuitECMNo.5 solenoid
circuitOFF±Vehicle repair
matrix chartOn±Vehicle repair
matrix chartTRAC ECUA/T fluid temp.
sensor circuit
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±65

AT2±43
Suspect Area
Symptom
Vehicle does not move in any forward position and reverse
No up±shift
No down±shift
No lock±up or No lock±up off
Vehicle does not move in R position
Harsh engagement
1st
1st " 2nd
2nd " 3rd
3rd " O/D
O/D " 3rd
3rd " 2nd
2nd " 1st
N " D
No engine braking
Transmission
control rod
Slip or Shudder
2nd
No kick±down
Lock±up
Forward and Reverse
Particular position
Manual valveParking lock pawlOil strainer1±2 shift valve2±3 shift valve
N " R
N " L
1st " 2nd (D position)
1st " 2nd " 3rd " O/D
2nd "3rd
3rd " O/D
1st " 2nd (2 position)
O/D " 3rd
Vehicle does not move in any particular position or positions
(except R position)
Reverse control
valve
See Page
Chapter 2. On±Vehicle Repair
(: A340E, A340F, A340H AUTOMATIC TRANSMISSION Repair Manual Pub. No.RM391U) AT2±66
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING