ON-BOARD DIAGNOSTIC OPERATION

id092200103400

Malfunction Detection Function

DTC table

Freeze Frame Data

―  Determine which unit is thought to be malfunctioning based on the warning light illumination, meters and gauges records recorded in the freeze frame data, and perform malfunction diagnosis.

―  Even for malfunctions that are not currently occurring, analysis of the period (traveled distance) and malfunction status (warning light, gauges, meters control status, type of malfunction) of past malfunction occurrence can be done from the freeze frame data.

Freeze frame data	Unit	Note
Malfunction type	—	•  Abnormal messages from the PCM •  Warning light illumination request signal from other units
Illuminated warning light	—	Target warning light: •  EPS warning light •  Generator warning light •  MIL •  Oil level warning light •  Coolant level warning light •  ABS warning light •  Brake system warning light •  AT warning light
Meter, gauge control status	—	Target meter, gauge: •  Speedometer •  Tachometer •  Water temperature gauge
Traveled distance after DTC recorded	km	Only the last four digits are recorded
DTC cleared flag	Cleared/Not cleared	The freeze frame data will not be cleared even if the DTC data is cleared. If a DTC is cleared, a DTC cleared flag 'Cleared' is recorded with the corresponding freeze frame data.

DTCs and recorded freeze frame data

•  The unit thought to be malfunctioning can be inferred from the content of the freeze frame data.

•  The traveled distance at the time of the DTC and the DTC cleared flag are also recorded in the DTC.

•  To avoid false diagnosis, verify whether the warning lights, meters or gauges are normal using the input/output check mode.

Warning light illumination request signal from other modules (U2064)

Abnormal messages from other module (U2023)

•  If several malfunction signals are received at the same time, the control status of several meters and gauges are stored in one freeze frame data.