Page 478 of 2543
Disconnect Cruise Control ECU connector.
Turn ignition switch ON.
Repair or replace harness or connector.
Check and replace ECM.
Check voltage between terminal OD of Cruise Control ECU harness side
connector and body ground.
Measure voltage between terminal OD of Cruise
Control ECU harness side connector and body
ground.
Voltage 4 ± 6 V
Check and replace Cruise Control ECU.
Check harness and connector between Cruise Control ECU and ECM (See
page IN±30).
AT1±92± AT340E (2JZ±GE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 491 of 2543
ELECTRONIC CONTROL SYSTEM
The electronic control system for the A340E automatic transmission provides extremely precise control of
the gear shift timing and lock±up timing in response to driving conditions as sensed by various sensors
located throughout the vehicle and in response to the engine's running condition.
At the same time, the ECM control reduces vehicle squat when the vehicle starts out and gear shift shock.
The electronic control system is also equipped with a self diagnosis system which diagnoses malfunctions
for the vehicle to continue functioning when a malfunction occurs.
CONSTRUCTION
The electronic control system can be broadly divided onto three groups; the sensors, ECM and actuators.
No. 1 Vehicle Speed Sensor
No. 2 Vehicle Speed Sensor
Crankshaft Position Sensor
Camshaft Position Sensor No.1, No.2
Park/Neutral Position Switch
Neutral Start Signal
Shift lever Position Signal
Idling Signal
Throttle Position Signal
Main (Sub) Ð throttle Position Sensor
Engine Coolant temp. Sensor
A/T Fluid Temp. Sensor
O/D Main Switch
Cruise Control ECU
Kick±Down Switch
Stop Light Switch
Pattern Select Switch
SENSORSECMACTUATORS
No.1 Solenoid Valve
No.2 Solenoid Valve
No.3 Solenoid Valve
No.4 Solenoid Valve
No.5 Solenoid Valve
Engine Torque Control (ESA)
Igniters
Ignition Coils
Distributors
Spark Plugs
O/D OFF Indicator Light
(Diagnostic Trouble Code
Display)
TRAC ECU
O/D Direct Clutch Speed Sensor
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONOPERATIONAT2±7
Page 518 of 2543
DIAGNOSIS SYSTEM
The automatic transmission has built±in self±diagnostic
functions. If a malfunction occurs in the system, the ECM
stores the diagnostic trouble code in memory and the O/D
OFF (Overdrive OFF) indicator light blinks to inform the driv-
er. The diagnostic trouble code stored in memory can be read
out by the following procedure.
O/D OFF INDICATOR LIGHT INSPECTION
1. Turn the ignition switch ON.
2. Check if the O/D OFF indicator light lights up when the O/D
main switch is pushed out to OFF and goes off when the O/D
main switch is pushed in to ON.
HINT: If the O/D OFF indicator light does not light up or stay
on all the time, carry out the check for ºO/D OFF Indicator
Light Circuitº on page AT2±108.
DIAGNOSTIC TROUBLE CODE CHECK
1. Turn the ignition switch ON, but do not start the engine.
2. Push in the O/D main switch to ON.
HINT: Warning and diagnostic trouble codes can be read only
when the O/D main switch is ON. If it is OFF, the O/D OFF indi-
cator light up will light continuously and will not blink.
3. Using SST, connect terminals TE1 and E1 of the DLC 1 or
DLC2.
SST 09843±18020
4. Read the diagnostic trouble code indicated by the number of
times the O/D OFF indicator light blinks
(See next page).
HINT: If the system is operating normally, the light will blink
2 times per second. AT2±34
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 519 of 2543
The trouble code is indicated as shown in the illustration at
left (Diagnostic trouble code º42º is shown as an example).
HINT: When 2 or more trouble codes are stored in memory,
the lower±numbered code is displayed first.
If no diagnostic trouble code is output, or if a diagnostic
trouble code is output even though no diagnostic trouble
code output operation is performed, check the TE1 terminal
circuit on page AT2±113
ECM DATA MONITOR USING TOYOTA
HAND±HELD TESTER
1. Hook up the TOYOTA hand±held tester to the DLC2.
2. Monitor the ECM data by following the prompts on the tester
screen.
HINT: TOYOTA hand±held tester has a ºSnapshotº function
which records the monitored data.
Please refer to the TOYOTA hand±held tester operator's
manual.
CANCELING DIAGNOSTIC TROUBLE
CODE
After repair of the trouble area, the diagnostic trouble code
retained in the ECM memory must be canceled out by remov-
ing the EFI No.1 fuse for 10 seconds or more, with the ignition
switch OFF.
Check that the normal code is output after connecting the
fuse.
ECM TERMINALS STANDARD VALUE
ECM TERMINAL VALUES
MEASUREMENT BY USING TOYOTA BREAK±OUT ±BOX
AND TOYOTA HAND±HELD TESTER
1. Hook up the TOYOTA break±out±box and TOYOTA
hand±held tester to the vehicle.
2. Read the ECM input/output values by following the prompts
on the tester screen.
HINT: TOYOTA hand±held tester has ºSnapshotº function.
This record the measured values and is effective in the diag-
nosis of intermittent problems.
Please refer to the TOYOTA hand±held tester/ TOYOTA
break±out±box operator's manual for further details.
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±35
Page 520 of 2543
CHECK TERMINAL TT OUTPUT
VOLTAGE
When a voltmeter is connected to the DLC2, the following
items can be checked.
1. Throttle position sensor signal
2. Brake signal
3. Shift position signal
1. VOLTMETER CONNECTION
Connect the positive (+) probe of the voltmeter to terminal TT
and the negative (±) probe to terminal E1 of the DLC2.
HINT: If a voltmeter with small internal resistance is used, the
correct voltage will not be indicated, so use a voltmeter with
an internal resistance of at least 10 k/V.
2. TURN IGNITION SWITCH TO ON (DO NOT START THE
ENGINE)
3. CHECK THROTTLE POSITION SENSOR SIGNAL
Check if the voltage changes from approx. 0 V to approx. 8
V when the accelerator pedal is gradually depressed from the
fully closed position.
4. CHECK BRAKE SIGNAL (LOCK±UP CUT SIGNAL)
(a) Open the throttle valve fully to apply approx. 8 V to terminal
TT.
(b) In this condition, check terminal TT voltage when the brake
pedal is depressed and released.
TT terminal voltage:
0 V (When brake pedal is depressed)
8 V (When brake pedal is released)
5. START ENGINE
6. CHECK SHIFT POSITION SIGNAL
(VEHICLE SPEED ABOVE 10 km/h, 6 mph)
Check up±shifting together with terminal TT voltage.
Gear Position Terminal TT output voltage 1st Gear 0 V
2nd Gear
2 V
3rd Gear 4 V
3rd Lock±up 5 V
O/D 6 V
O/D Lock±up 7 V
HINT: Check for light shocks from up±shifting and for
changes in the tachometer.
If terminal TT Output voltage check cannot be done, do the
check of TT terminal circuit on page AT2±115. AT2±36
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTING
Page 544 of 2543
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
Page 545 of 2543
(*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
Page 557 of 2543
WIRING DIAGRAM
Check voltage between terminal SP1 of ECM connector and body ground.
Check operation of odometer and trip meter (telltale light RH
(See page BE±48)).
Check and replace ECM.
Repair or replace harness or connector between
ECM and telltale light RH.
Go to
1. Shift the shift lever to N position
2. Jack up one of the rear wheels.
3. Connect the Check Harness A.
See page EG±510)
(1) Disconnect power steering ECU connector
and cruise control ECU connector.
(5) Turn ignition switch ON.
Measure voltage between terminal SP1 of ECM
connector and body ground when the wheel is
turned slowly.
Voltage is generated intermittently.
INSPECTION PROCEDURE
± A340E (2JZÐGTE) AUTOMATIC TRANSMISSIONTROUBLESHOOTINGAT2±73
