Toyota COMPUTER-CONTROLLED SYSTEM Training Manual page 148

4
DIAGNOSIS - OBD-II (On-Board Diagnostic System )
Conventional OBD
New OBD (OBD-II )
CHECK ENGINE When a proble m
LAMP has been detected
Lights Lights or blink s
When the proble m
has been solved
Goes off after about 5 seconds Goes off after 2 or 3 trip s
DIAGNOSTIC Code 2 digits ( e .g . : 25, 31)
5 digits (e .g . : P0120 )
CODE
Reading operation
Connection of terminal TE 1
and terminal
E l
Code display "CHECK ENGINE" lamp blink s
Code clearing*'
Removal of
memory
fuse
OBD-II scan tool o r
TOYOTA hand-held teste r
ENGINE ECU
Reading operation
Connection of terminal TE 2
DATA
and terminal
E l
Reading
DIAGNOSIS REDER, DIAGNOSI S
instruments
MONITOR, or TOYOTA hand-hel d
teste r
Output terminal
Terminal VF Terminal SDL* 2
Communication
Slow (about 1 .5 seconds) Fast ( about 0 .05 to 1 .0 seconds )
rate
Data display
Few
Man y
item s
Data displa y
method
Toyota standard SAE standar d
ACTIVE TEST*3
Not available
Available ( performed using a n
OBD-II scan tool or TOYOT A
FREEZE-FRAM DATA Not available hand-held tester )
* i
+ z
•3
In the case of a new OBD (OBD-II), diagnostic codes can also be cleared by removing the memory fuse in the
same manner as the conventional OBD .
SDL ; The communication terminal between the Engine ECU and the TOYOTA hand-held tester use the VPW
( Variable Pulse Width) system in accordance with the SAE J1850 requirements .
Actuators (injector, ISC valve, etc .) are operated by sending a signal from the tester to the Engine ECU .