Nissan Sentra Service Manual: U1002 System comm (CAN)

Nissan Sentra Service Manual / Brakes / Brake control system / Dtc/circuit diagnosis / U1002 System comm (CAN)

DTC Logic

DTC DETECTION LOGIC

DTC	Display item	Malfunction detected condition	Possible cause
U1002	SYSTEM COMM(CAN)	When ABS actuator and electric unit (control unit) is not transmitting or receiving CAN communication signal for 2 seconds or less.	CAN communication line ABS actuator and electric unit (control unit)

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If вЂњDTC CONFIRMATION PROCEDUREвЂќ has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.DTC REPRODUCTION PROCEDURE

With CONSULT

Turn the ignition switch ON.
Perform self diagnosis for вЂњABSвЂќ.

Is DTC вЂњU1002вЂќ detected? YES >> Proceed to BRC-88, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis Procedure

CAUTION:

Never apply 7.0 V or more to the measurement terminal.
Use a tester with open terminal voltage of 7.0 V or less.
Turn the ignition switch OFF and disconnect the battery cable from the negative terminal when checking the harness.

1.CHECK CAN DIAGNOSIS SUPPORT MONITOR

Select вЂњABSвЂќ and вЂњCAN Diagnosis Support MonitorвЂќ in order with CONSULT.
Check malfunction history between each control unit connected to ABS actuator and electric unit (control unit).

Check the result of вЂњPASTвЂќ? All items are вЂњOKвЂќ>>Refer to GI-39, "Intermittent Incident".

вЂњTRANSMIT DIAGвЂќ is other than вЂњOKвЂќ>>GO TO 2.

A control unit other than ABS actuator and electric unit (control unit) is anything other than вЂњOKвЂќ>>GO TO 3.

2.CHECK TRANSMITTING SIDE UNIT

Check the ABS actuator and electric unit (control unit) harness connector terminals 14 and 26 for damage or loose connection.

Is the inspection result normal? YES >> Erase self-diagnosis results. Then perform self-diagnosis for вЂњABSвЂќ with CONSULT.

NO >> Recheck terminals for damage or loose connection.

3.CHECK APPLICABLE CONTROL UNIT

Check damage or loose connection of each CAN communication line harness connector terminals.

Is the inspection result normal? YES >> Erase self-diagnosis results. Then perform self-diagnosis for applicable control unit with CONSULT.

NO >> Recheck terminals for damage or loose connection.

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