Toyota Camry Manual page 1224

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TOYOTA Hand–Held Tester

ENGINE (1MZ–FE)

DIAGNOSIS SYSTEM

When troubleshooting OBD II vehicles, the only dif-

ference from the usual troubleshooting procedure

is that you connect to the vehicle the OBD II scan

tool complying with SAE J1978 or TOYOTA hand–

held tester, and read off various data output from

the vehicle's ECM.

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 emission control

system/components or in the powertrain control

components which affect vehicle emissions, or a

malfunction in the computer. In addition to the MIL

lighting up when a malfunction is detected, the ap-

plicable Diagnostic Trouble Codes (DTC) pre-

scribed by SAE J2012 are recorded in the ECM

memory (See page DI–211).

If the malfunction does not reoccur in 3 consecutive trips, the

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

To check the DTC, connect the OBD II scan tool or

TOYOTA hand–held tester to Data Link Connector

3 (DLC3) on the vehicle. The OBD II scan tool or

TOYOTA hand–held tester also enables you to

erase the DTC and check freezed frame data and

various forms of engine data (For operating instruc-

tions, see the OBD II scan tool's instruction book.).

DTC include SAE controlled codes and manufac-

turer controlled codes. SAE controlled codes must

be set as prescribed by the SAE, while manufactur-

er controlled codes can be set freely by the

manufacturer within the prescribed limits (See DTC

chart on page DI–211).

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