Toyota Celica 2005, Repair Manual

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A04550
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DLC3
− DIAGNOSTICS ENGINE (2ZZ − GE)
DI − 297
2005 CELICA (RM1131U)
(b) Check the DLC3.
The vehicle’s ECM uses the ISO 9141
− 2 for communica-
tion protocol. The terminal arrangement of the DLC3 com-
plies with SAE J1962 and matches the ISO 9141
− 2 for-
mat.
Symbol Name Result
(Terminal No.) (Reference terminal) (Condition)
SIL Bus ”+” line Pulse generation
(7) (5 − Signal ground) (During transmission)
CG Chassis ground 1
Ω
or less
(4) (Body ground) (Always)
SG Signal ground 1 Ω or less
(5) (Body ground) (Always)
BAT Battery positive 9 to 14 V
(16) (Body ground) (Always)
HINT:
Connect the cable of the hand
− held tester to the DLC3, turn the
ignition switch ON and attempt to use the hand − held tester. If
the screen displays UNABLE TO CONNECT TO VEHICLE, a
problem exists in the vehicle side or the tester 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.
(c) Inspect the battery voltage.
Battery Voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
(d)
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 is not illuminated, troubleshoot the MIL circuit (See
page DI
− 663).
(2) When the engine is started, the MIL should not illu-
minate. If the lamp remains on, the diagnosis sys-
tem has detected a malfunction or abnormality in
the system.
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