Toyota Celica 2005, Руководство по ремонту

Страница: 960 / 2497

N09214
− DIAGNOSTICS AUTOMATIC TRANSAXLE (U341E)
DI − 759
2005 CELICA (RM1131U)
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
detection. 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 de-
tected once or momentarily (Hand
− held tester)
(See page DI − 758).
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.
Tester connection Condition Specified condition
7 (Bus
ę
Line) − 5 (Signal ground) During communication Pulse generation
4 (Chassis Ground) − Body Always 1
Ω
or less
5 (Signal Ground) − Body Always 1 Ω or less
16 (B
+
) − Body Always 9 to 14 V
HINT:
If your display shows ”UNABLE TO CONNECT TO VEHICLE”
when you have connected the cable of OBD II scan tool or
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 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.
959