B2557

INTELLIGENT KEY SYSTEM/ENGINE START FUNCTION


B2557 VEHICLE SPEED


DIAGNOSIS DESCRIPTION
B2557 vehicle speed signal compares the vehicle speed input from the unified meter and A/C amp. and ABS via CAN communication and the vehicle signal (8 pulses) from the unified meter and A/C amp. If there is the difference between each vehicle speed input, it judges that it is the malfunction and displays the DTC (Diagnostic Trouble Code).

TERMINALS AND REFERENCE VALUE FOR INTELLIGENT KEY UNIT






SELF-DIAGNOSTIC LOGIC






DIAGNOSTIC PROCEDURE
1.CHECK VEHICLE SPEED SIGNAL
Check the signal between Intelligent Key unit connector and ground.










OK or NG
OK - Check the condition of harness and connector. If it is OK, check the self-diagnosis results using
CONSULT-III again.
NG - GO TO 2.
2.CHECK HARNESS CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect Intelligent Key unit and unified meter and A/C amp. Connector.
3. Check continuity between Intelligent Key unit connector and unified meter and A/C amp. Connector.










4. Check continuity between Intelligent Key unit connector and ground.





OK or NG
OK -
- If the measured value is not waveform but 0V constant, the harness or connector between the using receiving the vehicle speed signal from unified meter and A/C amp. may be malfunctioning. Check these wirings.
- If the measured value is not waveform but 5V or 12V constant, replace unified meter and A/C etc. NG - Repair or replace harness.