Toyota ZZT230 series Repair Manual page 432

conneclion
T es ter
(Bus $ Une)-5 (Signal ground)
Body
7
-
{Chassi s Ground)
4 - Body
5 Ground)
{stgnal
-
•
DIAGNOSTICS
•
If the same malfunction is detected again during the 2nd test
drive, this 2nd detection causes the MIL to light up .
Inspect the DLC3.
(b)
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.
0
.....
Durii'IO communication
Condition
HINT:
If your display shows "UNABLE
when you have connected the cable of OBD
TOYOTA hand-held tester to DLC3, turned the ignition switch
ON and operated the scan tool, there is a problem on the ve­
hicle side or tool side.
•
If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.
•
If communication is still not possible when the tool is con­
nected connected to another vehicle, the problem is prob­
ably in the tool itself, so consult the Service Department
listed in the tool's instruction manu a!.
AUTOMATIC TRANSAXLE (U341E)
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.
(TOYOTA hand-held tester) (See page 01-220)
*2-trip detection logic:
When a logic malfunction is first detected, the mal­
function is temporarily stored in the ECM memory.
TO
Dl-221
Specified condition
Pulse generation
t nor less
t nor less
1 4 V
CONNECT TO VEHICLE"
II scan tool or