FI0534
DI5OU
−
02
P22892
DLC3
TOYOTA
−
Hand
−
Held Tester
−
DIAGNOSTICS
ENGINE
DI
−
3
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 Diagnostic
Trouble Codes (DTC) prescribed by SAE J2012 are
recorded in the ECM memory (See page
DI
−
13
).
If the malfunction does not reoccur in 3 trips, the MIL goes off
but the DTC remain recorded in the ECM memory.
S
To check the DTC, connect the OBD II scan tool or
TOYOTA hand
−
held tester to Data Link Connector
3 (DLC3) on the vehicle. The OBD II scan tool or
TOYOTA hand
−
held tester also enables you to
erase the DTCs and check freezed frame data and
various forms of engine data (For operating instruc-
tions, see the OBD II scan tool’s instruction book.).
S
DTC include SAE controlled codes and manufac-
turer controlled codes. SAE controlled codes must
be set as prescribed by the SAE, while manufactur-
er controlled codes can be set freely by the
manufacturer within the prescribed limits (See DTC
chart on page
DI
−
13
).
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