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DI-157
DIAGNOSTICS - AUTOMATIC TRANSAXLE
DI0CF-06
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
S When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you connect to the vehicle an OBD II scan
tool complying with SAE J1987 or TOYOTA hand-
held tester, and read off various data output from
FI0534
the vehicle's ECM.
OBD II regulations require that the vehicle's on-
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in drive system components which affect vehicle
emissions. In addition to the MIL lighting up when
a malfunction is detected, the applicable DTCs pre-
scribed by SAE J2012 are recorded in the ECM
memory (See page DI-13 ).
If the malfunction only occurs in 3-trip, the MIL goes
off but the DTCs remain recorded in the ECM
memory.
TOYOTA hand-held tester S To check the DTCs, connect an OBD II scan tool or
TOYOTA hand-held tester to DLC3 on the vehicle.
The OBD II scan tool or TOYOTA hand-held tester
also enables you to erase the DTCs and check
freeze frame data and various forms of engine data
(For instruction book).
S DTCs include SAE controlled codes and Manufac-
turer controlled codes.
DLC3 D02118 SAE controlled codes must be set as prescribed by
the SAE, while Manufacturer controlled codes can
be set freely by the manufacturer within the pre-
scribed limits (See DTC chart on page DI-168 ).
2001 SIENNA (RM787U)
Author : Date : 311
DI-158
DIAGNOSTICS - AUTOMATIC TRANSAXLE
S The diagnosis system operates in normal mode
during 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 check mode when
troubleshooting, the technician can cause the MIL
to light up and for a malfunction that is only detected
once or momentarily (TOYOTA hand-held tester)
(See page DI-157 ).
S *2-trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the ECM memory.
If the same malfunction is detected again during the
2nd test drive, this 2nd detection causes the MIL to
light up.
(b) Inspect the DLC3.
The vehicle's ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with SAE
J1962 and matches the ISO 9141-2 format.
N09214
Terminal No. Connection/ Voltage or Resistance Condition
7 Bus Line/ Pulse generation During communication
4 Chassis Ground Body/ 1 or less Always
5 Signal Ground Body/ 1 or less Always
16 Battery Positive Body/ 9 - 14 V Always
HINT:
If your display shows "UNABLE TO CONNECT TO VEHICLE"
when you have connected the cable of OBD II scan tool or
TOYOTA hand-held tester to DLC3, turned the ignition switch
ON and operated the scan tool, there is a problem on the ve-
hicle side or tool side.
S If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.
S If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.
2001 SIENNA (RM787U)
Author : Date : 312
DI-159
DIAGNOSTICS - AUTOMATIC TRANSAXLE
2. INSPECT DIAGNOSIS (NORMAL MODE)
(a) 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 BE-2 ).
(2) When the engine is started, the MIL should go off.
FI0534 If the lamp remains on, the diagnosis system has
detected a malfunction or abnormality in the sys-
tem.
(b) Check the DTC.
NOTICE:
TOYOTA hand-held tester only: When the diagnostic sys-
tem is switched from normal mode to check mode, it erases
all DTCs and freeze frame data recorded in normal mode.
So before switching modes, always check the DTCs and
freeze frame data, and note them down.
(1) Prepare an OBD II scan tool (complying with SAE
J1978) or TOYOTA hand-held tester.
TOYOTA hand-held tester (2) Connect the OBD II scan tool or TOYOTA hand-
held tester to DLC3 at the lower of the instrument
panel.
(3) Turn the ignition switch ON and turn the OBD II scan
tool or TOYOTA hand-held tester switch ON.
(4) Use the OBD II scan tool or TOYOTA hand-held
tester to check the DTCs and freeze frame data and
note them down (For operating instructions, see the
DLC3 D02118 OBD II scan tool's instruction book).
(5) See page DI-168 to confirm the details of the
DTCs.
NOTICE:
When simulating symptoms with an OBD II scan tool (ex-
cluding TOYOTA hand-held tester) to check the DTCs, use
normal mode. For codes on the DTCs chart subject to
"2-trip detection logic", turn the ignition switch OFF after
the symptoms have been simulated the 1st time. Then re-
peat the simulation process again. When the program has
DTCs they are recorded in the ECM.
2001 SIENNA (RM787U)
Author : Date : 313
DI-160
DIAGNOSTICS - AUTOMATIC TRANSAXLE
3. INSPECT DIAGNOSIS (CHECK MODE)
HINT:
TOYOTA hand- held tester only: Compared to the normal
mode, the check mode has high sensing ability to detect mal-
functions. Furthermore, the same diagnostic items which are
detected in Normal mode can also be detected in Check mode.
(a) Check the DTC.
(1) Check the initial conditions.
S Battery positive voltage 11 V or more.
S Throttle valve fully closed.
S Transaxle in P position.
S Air conditioning switched OFF.
(2) Turn the ignition switch OFF.
(3) Prepare a TOYOTA hand-held tester.
TOYOTA hand-held tester (4) Connect the TOYOTA hand-held tester to DLC3 at
the lower of the instrument panel.
(5) Turn the ignition switch ON and switch the TOYOTA
hand-held tester ON.
DLC3 D02118
(6) Switch the TOYOTA hand-held tester from Normal
mode to Check mode (Check that the MIL flashes).
0.13 sec. 0.13 sec. (7) Start the engine (MIL goes out after the engine
starts).
ON
(8) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
OFF Leave the ignition switch ON until you have checked the
BR3904 DTCs, etc.
(9) After simulating the malfunction conditions, use the
TOYOTA hand-held tester diagnosis selector to
check the DTCs and freeze frame data, etc.
HINT:
Take care not to turn the ignition switch OFF, as turning it off
switches the diagnosis system from Check mode to Normal
mode, so all DTCs, etc. are erased.
(10) After checking the DTC, inspect the applicable cir-
cuit.
2001 SIENNA (RM787U)
Author : Date : 314
DI-161
DIAGNOSTICS - AUTOMATIC TRANSAXLE
(b) Clear the DTC.
The following operation will erase the DTC and freeze
frame data. Operating an OBD II scan tool (complying
with SAE J1978) or TOYOTA hand-held tester to erase
the codes (See the OBD II scan tool's instruction book for
operating instructions.).
4. ROAD TEST
NOTICE:
Perform the test at normal operating ATF temperature 50 - 80 ◦ Jabse Service Manual Search 2026 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo