
DI5K9
−
03
Q08225
Q08634
TOYOTA Hand
−
held Tester
DLC3
−
DIAGNOSTICS
AUTOMATIC TRANSMISSION
DI
−
131
1996 LAND CRUISER (RM451U)
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 the OBD II scan
tool complying with SAE J1978 or TOYOTA hand
−
held tester, and read off various data output from
the vehicle’s ECM.
S
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 does not occurs in 3 trips, the MIL goes off but
the DTCs remain recorded in the ECM memory.
S
To check the DTCs, connect an OBD II scan tool or
TOYOTA hand
−
held tester to the DLC3 on the ve-
hicle. 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 en-
gine data (For operating instructions, see the OBDII
scan tool’s instruction book).
S
DTCs include SAE controlled codes and Manufac-
turer controlled codes.
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 page
DI
−
143
).
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Version 1.00 - 12/21/2010