Toyota Camry Manual page 241

AX2–54
AUTOMATIC TRANSAXLE –
DIAGNOSIS SYSTEM
DESCRIPTION
When troubleshooting OBDII vehicles, the only dif–
ference from the usual troubleshooting procedure is
that you connect to the vehicle the OBDII scan tool
complying with SAE J1978 or TOYOTA hand–held
tester, and read off various data output from the
vehicle's ECM.
OBD ll regulations require that the vehicle's on –
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com–
puter detects a malfunction in the computer itself or
in drive system components which affect vehicle emi–
ssions. As in previous models, when the ECM detects
a malfunction in the transaxle control section, the MIL
lights up and the O/D OFF indicator light blinks. In
addition to the MIL lighting up when a malfunction is
detected, the applicable diagnostic trouble codes pre–
scribed by SAE J 2012 are recorded in the ECM
memory. (See page EG–404)
If the malfunction only occurs in 3 trips, the MIL goes
off but the diagnostic trouble codes remain recorded
in the ECM memory. The O/D OFF indicator light goes
off as soon as the trouble is no longer detected.
To check the diagnostic trouble codes, connect the
OBDII scan tool or TOYOTA hand–held tester to
Data Link Connector 3 on the vehicle. The OBD ll
scan tool or TOYOTA hand–held tester also enables
you to erase the diagnostic trouble codes and check
freezed frame data and various forms of engine data.
(For operating instructions, see the OBD III scan tool's
instruction book.)
Diagnostic trouble codes include SAE controlled
codes and Manufacturer controlled codes.
SAE controlled codes must be set as prescribed by the
SAE, while Manufacturer controlled codes can be set
freely by the manufacturer within the prescribed
limits.
(See diagnostic trouble code chart on page AX2–62)
TROUBLESHOOTING