Toyota Celica 2005, Руководство по ремонту

Страница: 869 / 2497

N09214
DI − 670
− DIAGNOSTICS AUTOMATIC TRANSAXLE (U240E)
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 for a malfunction that is only detected
once or momentarily (Hand
− held tester) (See page
DI − 669).
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.
868