DTC Detection Logic

DTC

CONSULT screen terms

DTC detection condition

[Trouble diagnosis content]

[Malfunction type]

U0429

00

COMMUNICATION ERROR (INVALID)

[Implausible data were received from the steering column module.]

[NO SUBTYPE INFORMATION]

1

Diagnosis condition

Steering column control module message was received.

Signal (terminal)

CAN communication

Threshold

For every message, a DLC error counter is increased in the CAN receive interrupt if message with incorrect data length is received. This error counter is compared against a predefined threshold value in a periodic function and malfunction is logged if threshold is breached.

Diagnosis delay time

20 consecutive received messages with to short DLC.

U0429

00

COMMUNICATION ERROR (INVALID)

[Implausible data were received from the steering column module.]

[NO SUBTYPE INFORMATION]

2

Diagnosis condition

Steering column control module message was received.

Signal (terminal)

CAN communication

Threshold

For every message, a update counter error counter is increased in the CAN receive interrupt if message with incorrect update counter is received. This error counter is compared against a predefined threshold value in a periodic function and malfunction is logged if threshold is breached.

Diagnosis delay time

20 consecutive received messages with invalid counter steps.

U0429

00

COMMUNICATION ERROR (INVALID)

[Implausible data were received from the steering column module.]

[NO SUBTYPE INFORMATION]

3

Diagnosis condition

Steering column control module message was received.

Signal (terminal)

CAN communication

Threshold

For every message, a checksum error counter is increased in the CAN receive interrupt if message with incorrect checksum is received. This error counter is compared against a predefined threshold value in a periodic function and malfunction is logged if threshold is breached.

Diagnosis delay time

20 consecutive received messages with wrong checksum.