Toyota Celica 2005 Repair Manual page 959

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2005 CELICA (RM1131U)

Hand−held tester

AUTOMATIC TRANSAXLE (U341E)

DIAGNOSIS SYSTEM

When troubleshooting OBD II vehicles, the only dif-

ference from the usual troubleshooting procedure

is that you connect the vehicle to an OBD II scan

tool complying with SAE J1987 or hand−held tester,

and read off various data output from the vehicle's

OBD II 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

emissions. In addition to the MIL lighting up when

a malfunction is detected, the applicable DTCs pre-

scribed by SAE J2012 are recorded in the ECM

memory (See page DI−42).

If the malfunction does not occur in 3 consecutive trips, the MIL

goes off but the DTCs remain recorded in the ECM memory.

To check the DTCs, connect an OBD II scan tool or

hand−held tester to DLC3 on the vehicle. The OBD

II scan tool or hand−held tester also enables you to

erase the DTCs and check freeze frame data and

various forms of engine data (For operating instruc-

tions, see the instruction book).

DTCs include SAE controlled codes and Manufac-

turer 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 pre-

scribed limits (See DTC chart on page DI−781).

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