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DI-608
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
DI1KG-03
TOYOTA hand-held tester PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
ECM controls the function of immobiliser on this vehicle.
Data of the immobiliser or DTC can be read form DLC3 of
the vehicle. When a trouble occurs in immobiliser, MIL
does not light ON but DTC inspection is performed.
Therefore when there seems to be a trouble with immobi-
DLC3 A01670
liser, use TOYOTA hand-held tester or SST to check and
troubleshoot it.
(b) Inspect the DLC3.
The vehicle's ECM uses ISO 9141-2 for communication.
The terminal arrangement of DLC3 complies with
SAEJ1962 and matches the ISO 9141-2 format.
N09214
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 - 14 V
HINT:
If your display shows "UNABLE TO CONNECT TO VEHICLE"
when you have connected the cable of OBD ll scan tool or TOY-
OTA hand-held tester to DLC3, turned the ignition switch ON
and operated the scan tool, there is a problem on the vehicle
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 impossible 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 : 762
DI-609
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
2. INSPECT DIAGNOSIS
(a) Check the DTC (Using TOYOTA hand-held tester)
(1) Prepare the OBD ll scan tool (complying with SAEJ
1978) or TOYOTA hand-held tester.
(2) Connect the OBD ll scan tool or TOYOTA hand-
held tester to DLC3 under the instrument panel low-
er pad.
(3) Turn the ignition switch ON and turn the OBD ll scan
tool or TOYOTA hand-held tester switch ON.
(4) Use the OBD ll scan tool or TOYOTA hand-held
tester to check the DTCs and freeze frame data,
note them down (For operating instructions, see the
OBD ll scan tool's instruction book.).
(5) See page DI-61 1 to confirm the details of the
DTCs.
(b) Check the DTC (Using diagnosis check wire).
E1 DLC1
(1) Turn ignition switch ON.
(2) Using SST, connect between terminals 8 (TE1) and
3 (E1) of DLC1.
SST 09843-18040
(3) Read the diagnostic trouble code from malfunction
indicator lamp.
HINT:
TE1
F02201 S If a diagnostic trouble code is not output, check the Tc ter-
minal circuit .
S ECM controls the immobiliser function on this vehicle,
DTC is out put with DTC of engine.
Normal code S As an example, the blinking patterns for codes; normal,
12 and 99 are shown in the illustration.
0.25 Sec. 0.25 Sec.
BR3904
2001 SIENNA (RM787U)
Author : Date : 763
DI-610
DIAGNOSTICS - ENGINE IMMOBILISER SYSTEM
0.5 Sec. 0.5 Sec. Malfunction Code (Example Code 12, 99)
4.5 Sec.
1.5 Sec. 2.5 Sec. One Cycle
I02680
(4) When DTC "99" is output, there is a trouble with
immobiliser. Start troubleshooting referring to
PROBLEM SYMPTOM TABLE.
(5) After completing the check, disconnect terminals 13
(TC) and 4 (CG) and turn OFF the display.
HINT:
In the event of 2 or more malfunction codes, indication will begin
from the smaller numbered code and continue in order to the
larger.
(c) Clear the DTC.
The following procedures will erase the DTCs and freeze
frame data.
(1) Operating the OBD ll scan tool (complying with
SAEJ1978) or TOYOTA hand-held tester to erase
the codes. (See the OBD ll scan tool's instruction
book for operating instructions.)
(2) Disconnecting the battery terminals or EFI fuse.
2001 SIENNA (RM787U)
Author : Date : 764
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