Nissan Sentra Service Manual: U1000 CAN Comm circuit

Nissan Sentra Service Manual / Steering / Steering control system / DTC/circuit diagnosis / U1000 CAN Comm circuit

Description

Can (controller area network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In can communication, control units are connected with 2 communication lines (can-h line, can-l line) allowing a high rate of information transmission with less wiring.

Each control unit communicate data but selectively reads required data only.

DTC Logic

Dtc detection logic

Dtc	Display item	Malfunction detected condition	Possible cause
U1000	Can comm circuit	Eps control unit is not transmitting/receiving can communication signal for 2 seconds or more.	Can communication malfunction EPS control unit

Dtc confirmation procedure

1.PRECONDITIONING

If DTC CONFIRMATION PROCEDURE 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 off to on.
Perform EPS self-diagnosis.

Is DTS U1000 detected? Yes >> proceed to diagnosis procedure. Refer to stc-30, "diagnosis procedure".

No >> inspection end.

Diagnosis Procedure

Proceed to lan-16, "trouble diagnosis flow chart".

C1609 Vehicle speed signal

DTC Logic Dtc detection logic DTC Display item Malfunction detected condition Possible cause C1609 CAN VHCL SPEED Malfunction is detected in vehicle speed sig ...

EPS Warning lamp

Component Function Check 1.CHECK THE ILLUMINATION OF THE EPS WARNING LAMP Check that the EPS warning lamp turns ON when ignition switch turns ON. Then, EPS warning lamp turns OFF after the engin ...

Other materials:

Steering column
Inspection STEERING COLUMN ASSEMBLY Check each part of steering column assembly for damage or other malfunctions. Replace entire steering column assembly if any parts are damaged. Measure steering column rotating torque using Tool. Replace steering column assembly if outside the ...

Dtc/circuit diagnosis
U1000 can comm circuit Description Refer to LAN-7, "CAN COMMUNICATION SYSTEM : System Description". Dtc logic DTC DETECTION LOGIC NOTE: U1000 can be set if a module harness was disconnected and reconnected, perhaps during a repair. Confirm that there are actual CAN diagnostic sym ...

Ecu diagnosis information
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