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DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-533
TRANSAXLE [ECT]
05NPC-01
PRE-CHECK
1. DIAGNOSIS SYSTEM
(1) When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you need to connect an OBD II scan tool com-
plying with SAE J1987 or a hand-held tester to the
vehicle, and read off various data output from the
vehicle's ECM.
(2) OBD II regulations require that the vehicle's on-
board computer illuminate the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in the drive system components which affect the ve-
hicle emissions. In addition to the MIL illuminating
when a malfunction is detected, the applicable
DTCs prescribed by SAE J2012 are recorded in the
FI0534 ECM memory (See page 05-555 ).
If the malfunction does not occur in 3 consecutive trips, the MIL
goes off but the DTCs remain in the ECM memory.
(3) To check the DTCs, connect the OBD II scan tool or
hand-held tester to the DLC3 of the vehicle. The
OBD II scan tool or hand-held tester also enables
you to erase the DTCs and check freeze frame data
and various forms of engine data (For instruction
book).
(4) The DTCs include SAE controlled codes and
Manufacturer controlled codes. SAE controlled
codes must be set as prescribed by the SAE, while
Manufacturer controlled codes can be set freely by
a manufacturer within the prescribed limits (See the
DTC chart on page 05-555 ).
(5) The diagnosis system operates in the normal mode
during the normal vehicle use, and also has a check
mode for technicians to simulate malfunction symp-
toms and perform troubleshooting. Most DTCs use
2 trip detection logic(*) to prevent erroneous detec-
tion. By switching the ECM to the check mode when
troubleshooting, technicians can cause the MIL to
illuminate for a malfunction that is only detected
once or momentarily. (hand-held tester).
(6) *2 trip detection logic:
When a malfunction is first detected, the malfunc-
tion is temporarily stored in the ECM memory. If the
same malfunction is detected again during the se-
cond test drive, this second detection causes the
MIL to illuminate.
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(a) Inspect the DLC3.
The vehicle's ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with SAE
1 23 4 5 6 78 J1962 and matches the ISO 9141-2 format.
9 10111213141516
DLC3
A04550
Tester connection Condition Specified condition
7 (Bus Line) - 5 (Signal ground) During communication Pulse generation
4 (Chassis Ground) - Body Always 1 or less
5 (Signal Ground) - Body Always 1 or less
16 (B+) - Body Always 9 to 14 V
HINT:
If your display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the OBD II scan tool or
hand-held tester to the DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
side or tool side.
S If the communication is normal when the tool is connected
to another vehicle, inspect the DLC3 on the original ve-
hicle.
S If the communication is still impossible when the tool is
connected to another vehicle, the problem is probably in
the tool itself, so consult the Service Department listed in
the tool's instruction manual.
(b) Inspect the battery voltage.
Battery Voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
(c) Check the MIL.
(1) The MIL comes on when the ignition switch is turned
ON and the engine is not running.
HINT:
If the MIL does not light up, troubleshoot the combination meter
(See page 05-1538 ).
(2) When the engine is started, the MIL should go off.
If the lamp remains on, it means that the diagnosis
system has detected a malfunction or abnormality
in the system.
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2. Normal Mode:
DTC CHECK
NOTICE:
Hand-held tester only:
When the diagnostic system is switched from the normal
mode to the check mode, all the DTCs and freeze frame
data recorded in the normal mode will be erased. So before
switching modes, always check the DTCs and freeze frame
data, and note them down.
(a) Checking DTCs using the OBD II scan tool or hand-held
tester.
(1) Connect the OBD II scan tool or hand-held tester
to DLC3.
(2) Turn the ignition switch ON.
DLC3 (3) Use the OBD II scan tool or hand-held tester to
check the DTCs and freeze frame data and note
Hand-Held them down (For operating instructions, see the
Tester
G25492 OBD II scan tool's instruction book).
(4) See page 05-555 to confirm the details of the
DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding hand-held tester) to check the DTCs, use the nor-
mal mode. For codes on the DTCs chart subject to "2 trip
detection logic", turn the ignition switch OFF after the
symptom is simulated once. Then repeat the simulation
process again. When the problem has been simulated
twice, the MIL is indicated on the instrument panel and
DTCs are recorded in the ECM.
(b) When using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
(1) Connect the OBD II scan tool or hand-held tester
to DLC3.
(2) Turn the ignition switch ON.
(3) When operating an OBD II scan tool (complying
with SAE J1978) or hand-held tester to erase the
codes, the DTCs and freeze frame data will be
erased. (See the OBD II scan tool's instruction book
for operating instructions.)
(c) When not using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
(1) Disconnecting the battery terminal or remove the
EFI and ETCS fuse from engine room J/B for 60 se-
conds or more.
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3. Check Mode:
DTC CHECK
HINT:
Hand-held tester only:
Compared to the normal mode, the check mode has more sens-
ing ability to detect malfunctions. Furthermore, the same diag-
nostic items which are detected in the normal mode can also be
detected in the check mode.
(a) Procedure for Check Mode using the hand-held tester.
(1) Check the initial conditions.
S Battery positive voltage 11 V or more
S Throttle valve fully closed
S Transaxle in P or N position
DLC3 S A/C switched OFF
(2) Turn the ignition switch OFF.
Hand-Held (3) Connect the hand-held tester to the DLC3.
Tester
G25492 (4) Turn the ignition switch ON.
(5) Switch the hand-held tester from the normal mode
to the check mode (Check that the MIL flashes).
0.13 sec. 0.13 sec. NOTICE:
If the hand-held tester switches the ECM from the normal
ON mode to the check mode or vice-versa, or if the ignition
switch is turned from ON to ACC or OFF during the check
mode, the DTC and freeze frame data will be erased.
OFF (6) Start the engine (MIL goes off after the engine
BR3904 starts).
(7) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
Leave the ignition switch ON until you have checked the
DTCs, etc.
(8) After simulating the malfunction conditions, use the
hand-held tester diagnosis selector to check the
DTCs and freeze frame data, etc.
HINT:
Be sure not to turn the ignition switch OFF, as turning it OFF
switches the diagnosis system from the check mode to the nor-
mal mode, which erases all the DTCs, etc.
(9) After checking the DTC, inspect the applicable cir-
cuit.
(b) When using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
(1) Connect the OBD II scan tool or hand-held tester
to DLC3.
(2) Turn the ignition switch ON.
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(3) When operating an OBD II scan tool (complying
with SAE J1978) or hand-held tester to erase the
codes, the DTCs and freeze frame data will be
erased. (See the OBD II scan tool's instruction book
for operating instructions.)
(c) When not using the OBD II scan tool or hand-held tester:
Clearing the DTCs.
(1) Disconnecting the battery terminal or remove the
EFI and ETCS fuse from engine room J/B for 60 se-
conds or more.
4. DATA LIST
HINT:
According to the DATA LIST displayed by the OBD II scan tool or Hand-held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one method to shorten work time.
(a) Warm up the engine.
(b) Turn the ignition switch OFF.
(c) Connect the OBD II scan tool or hand-held tester to the DLC3.
(d) Turn the ignition switch ON.
(e) According to the display on tester, read the "DATA LIST".
Measurement Item/
Item Normal Condition Diagnostic Note
Display (Range)
Stop light SW Status/ S Brake Pedal is depressed: ON
STOP LIGHT SW -
ON or OFF S Brake Pedal is released: OFF
Shift Lever Position is;
S L: 1st
Actual Gear Position/ S 2: 1st or 2nd
SHIFT -
1st, 2nd, 3rd, 4th or 5th S 3: 1st, 2nd or 3rd
S 4: 1st, 2nd, 3rd or 4th
S D: 1st, 2nd, 3rd, 4th or 5th
Shift lever position is;
PNP SW Status/
PNP SW [NSW] P or N: ON
ON or OFF
Except P or N: OFF
Shift lever position is;
PNP SW Status/
REVERSE R: ON
ON or OFF
Except R: OFF
Shift lever position is;
PNP SW Status/ The shift lever position and these
DRIVE D and 4: ON
ON or OFF values are different, there are fail-
Except D and 4: OFF
ures of the PNP switch or shift
Shift lever position is;
PNP SW Status/ cable adjustment.
4TH/DRIVE 4: ON
ON or OFF HINT:
Except 4: OFF
When the failure still occurs even
Shift lever position is;
PNP SW Status/ after adjusting these parts,
3RD 3: ON
ON or OFF (See page 05-566 ).
Except 3: OFF
Shift lever position is;
PNP SW Status/
2ND 2 and L: ON
ON or OFF
Except 2 and L: OFF
Shift lever position is;
PNP SW Status/
LOW L: ON
ON or OFF
Except L: OFF
Shift Solenoid SLT Status/
SOLENOID (SLT) IG SW ON: ON -
ON or OFF
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05-538 DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC
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ATF Temp. Sensor Value/ If the value is "-40 _C (-40 _F)" or
80 _C (176 _F)
AT FLUID TEMP min.: -40 _C (-40 _F) "225 _C (437 _F)", ATF temp. sen-
(After Stall Test)
max.: 225 _C (437 _F) sor circuit is opened or shorted.
Counter Gear Speed D Position is warmed up, 3rd;
SPD (NC) -
display: 50 r/min Same as input shaft speed
5. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten work time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the ignition switch OFF.
(c) Connect the hand-held tester to the DLC3.
(d) Turn the ignition switch ON.
(e) According to the display on tester, perform the "ACTIVE TEST".
Item Test Details Diagnostic Note
[Test Details]
Operate the shift solenoid valve and set the each shift position by your-
self.
[Vehicle Condition] Possible to check the operation of
SHIFT
Less than 50 km/h (31 mph) the shift solenoid valves.
[Others]
S Press button: Shift up
S Press button: Shift down
[Test Details]
Control the shift solenoid DSL to set the ATM to the lock-up condition. Possible to check the DSL opera-
LOCK UP
[Vehicle Condition] tion.
Vehicle Speed: 58 km/h (36 mph) or more
[Test Details]
Operate the shift solenoid SLT and raise the line pressure.
[Vehicle Condition]
S Vehicle Stopped.
LINE PRESS UP * -
S IDL: ON
[Others]
OFF: Line pressure up.
ON: No action (normal operation)
*: "LINE PRESS UP" in ACTIVE TEST is performed to check the line pressure changes by connecting the
SST to the automatic transaxle same as used in HYDRAULIC TEST.
HINT:
The pressure values in ACTIVE TEST and HYDRAULIC TEST are different from each other.
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6. DEFINITION OF TERMS
Term Definition
Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and its details).
Related DTCs A group of diagnostic trouble codes that are output by the ECM based on the same malfunction detection logic.
Preconditions that allow the ECM to detect malfunctions.
Typical enabling condition With all preconditions satisfied, the ECM sets the DTC when the monitored value(s) exceeds the malfunction
threshold(s).
The priority order that is applied to monitoring, if multiple sensors and components are used to detect the malfunc-
tion.
Sequence of operation
While another sensor is being monitored, the next sensor or component will not be monitored until the previous
monitoring has concluded.
Required sensor/compo-
The sensors and components that are used by the ECM to detect malfunctions.
nents
The number of times that the ECM checks for malfunctions per driving cycle.
"Once per driving cycle" means that the ECM detects malfunction only one time during a single driving cycle.
Frequency of operation
"Continuous" means that the ECM detects malfunction every time when enabling condition is met during a single
driving cycle.
The minimum time that the ECM must sense a continuous deviation in the monitored value(s) before setting a
Duration
DTC. This timing begins after the "typical enabling conditions" are met.
Malfunction thresholds Beyond this value, the ECM will conclude that there is a malfunction and set a DTC.
MIL illumination timing after a defect is detected.
"Immediately" means that the ECM illuminates MIL the instant the ECM determines that there is a malfunction.
MIL operation
"2 driving cycle" means that the ECM illuminates MIL if the same malfunction is detected again in the 2 nd driving
cycle.
7. TOYOTA/LEXUS PART AND SYSTEM NAME LIST
This reference list indicates the part names used in this manual along with their definitions.
TOYOTA/LEXUS name Definition
Toyota HCAC system, Hydrocarbon adsorptive Catalyst
HC adsorptive three-way catalytic converter
(HCAC) system, HC adsorptive three-way catalyst
Variable Valve Timing sensor, VVT sensor Camshaft position sensor
Variable valve timing system, VVT system Camshaft timing control system
Camshaft timing oil control valve, Oil control valve OCV,
Camshaft timing oil control valve
VVT, VSV
Variable timing and lift, VVTL Camshaft timing and lift control
Crankshaft position sensor "A" Crankshaft position sensor
Engine speed sensor Crankshaft position sensor
THA Intake air temperature
Knock control module Engine knock control module
Knock sensor Engine knock sensor
Mass or volume air flow circuit Mass air flow sensor circuit
Vacuum sensor Manifold air pressure sensor
Internal control module, Control module, Engine control
Power train control module
ECU, PCM
FC idle Deceleration fuel cut
Idle air control valve Idle speed control
VSV for CCV, Canister close valve VSV for canister control Evaporative emissions canister vent valve
VSV for EVAP, Vacuum switching valve assembly No. 1,
Evaporative emissions canister purge valve
EVAP VAV, Purge VSV
VSV for pressure switching valve, Bypass VSV Evaporative emission pressure switching valve
Vapor pressure sensor, EVAP pressure sensor, Evaporative
Fuel tank pressure sensor
emission control system pressure sensor
Charcoal canister Evaporative emissions canister
ORVR system On-boad refueling vapor recovery system
Intake manifold runner control Intake manifold tuning system
Intake manifold runner valve, IMRV, IACV (runner valve) Intake manifold tuning valve
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TOYOTA/LEXUS name Definition
Intake control VSV Intake manifold tuning solenoid valve
AFS Air fuel ratio sensor
O2 sensor Heater oxygen sensor
Oxygen sensor pumping current circuit Oxygen sensor output signal
Oxygen sensor reference ground circuit Oxygen sensor signal ground
Accel position sensor Accelerator pedal position sensor
Throttle actuator control motor, Actuator control motor, Elec-
Electronic throttle actuator
tronic throttle motor, Throttle control motor
Electronic throttle control system, Throttle actuator control
Electronic throttle control system
system
Throttle/pedal position sensor, Throttle/pedal position switch,
Throttle position sensor
Throttle position sensor/switch
Turbo press sensor Turbocharger pressure sensor
Turbo VSV Turbocharger pressure control solenoid valve
P/S pressure switch Power-steering pressure switch
VSV for ACM Active control engine mount
Speed sensor, Vehicle speed sensor "A", Speed sensor for
Vehicle speed sensor
skid control ECU
ATF temperature sensor, Trans. fluid temp. sensor, ATF
Transmission fluid temperature sensor
temperature sensor "A"
Electronic controlled automatic transmission, ECT Electronically controlled automatic
Intermediate shaft speed sensor "A" Couter gear speed sensor
Output speed sensor Output shaft speed sensor
Input speed sensor, Input turbine speed sensor "A", Speed
Input turbine speed sensor
sensor (NT), Turbine speed sensor
PNP switch, NSW Park/neutral position switch
Pressure control solenoid Transmission pressure control solenoid
Shift solenoid Transmission shift solenoid valve
Transmission control switch, Shift lock control unit Shift lock control module
Engine immobilizer system, Immobilizer system Vehicle anti-theft system
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8. The monitor will run whenever the following DTCs are not present (Monitor disablement List)
HINT:
This table indicates ECM monitoring status for the items in the upper columns if the DTCs in each line on
the left are being set.
As for the "X" mark, when the DTC on the left is stored, detection of the DTC in the upper column is not per-
formed
A92385 A98648
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A92386
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A92387 A98729
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A92388
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A92389
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A92390
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9. PROBLEM SYMPTOM CONFIRMATION
(a) Taking into consideration the results of the customer problem analysis, try to reproduce the symptoms.
If the problem is that the transaxle does not shift up, shift down, or the shift point is too high or too low,
conduct the following road test referring to the automatic shift schedule and simulate the problem
symptoms.
10. ROAD TEST
NOTICE:
Perform the test at the ATF temperature 50 to 80◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo