Toyota AVENSIS 2000 Supplement Manual page 194

1 2 3 4 5 6
9 10 1112 1314
DLC3
Tester connection
7 (Bus Line) – 5 (Signal ground)
4 (Chassis Ground) – Body
16 (B+) – Body
AVENSIS/CORONA SUP (RM781E)
DIAGNOSTICS
(b)
7 8
1516
A04550
During communication
Always
Always
HINT:
If your display shows "UNABLE TO CONNECT TO VEHICLE"
when you have connected the cable of OBD scan tool or hand–
held tester to the DLC3, turned the ignition switch ON and oper-
ated the scan tool, there is a problem on the vehicle side or tool
side.
– AUTOMATIC TRANSAXLE (U240E)
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 detec-
tion. By switching the engine and ECT ECU to
check mode when troubleshooting, the technician
can cause the CHK ENG to light up and for a mal-
function that is only detected once or momentarily
(hand–held tester) (See page DI–62).
S
*2 trip detection logic:
When a logic malfunction is first detected, the mal-
function is temporarily stored in the engine and ECT
ECU memory. If the same malfunction is detected
again during the 2nd test drive, this 2nd detection
causes the CHK ENG to light up .
Inspect the DLC3.
The vehicle's engine and ECT ECU uses ISO 9141–2 for
communication. The terminal arrangement of DLC3 com-
plies with ISO15031–3 and matches the ISO 9141–2 for-
mat.
Condition
S
If communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.
S
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 manual.
DI–63
Specified condition
Pulse generation
1 Ω or less
9 – 14 V