ON-BOARD DIAGNOSTIC OPERATION

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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: •  Air bag system warning light •  Generator warning light •  MIL •  Oil pressure warning light •  ABS warning light •  Brake system warning light •  AT warning light •  Keyless warning light •  4WD warning light •  DSC indicator 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.

Input/Output Check Mode

Operation procedure

•  Refer to the Workshop Manual.

Input circuit check

•  When the parts listed in the chart are operated and signal is output to the instrument cluster, the built-in microcomputer determines the operability of the input circuit based on that signal.

Check code	Parts sending input signal
08	TNS relay
22	Fuel gauge sender unit
55	Dimmer switch
59	Fuel system signal

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Individual circuit check

•  By operating the parts listed in the chart, the built-in microcomputer determines the operability of the individual parts.

Check code	Parts sending input signal
12	Speedometer
13	Tachometer
14	Buzzer
16	Fuel-level warning light
23	Fuel gauge
25	Water temperature gauge
26	LCD, warning and indicator light
57	Panel light control

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PID/Data Monitor and Record

Monitor item table