Nissan Sentra manuals

Nissan Sentra Service Manual: 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 malfunction 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 independently). 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 transmits/receives data but selectively reads required data only.

DTC Logic

DTC DETECTION LOGIC

DTC

CONSULT screen terms (Trouble diagnosis content)

DTC detection condition

Possible causes

U1000 CAN COMM CIRCUIT (CAN Communication Line) When the ignition switch is ON, TCM cannot send the CAN communication signal continuously for 2 seconds or more. Harness or connector (CAN communication line is open or shorted)

DTC CONFIRMATION PROCEDURE

1.PREPARATION BEFORE WORK

If another “DTC CONFIRMATION PROCEDURE” occurs just before, turn ignition switch OFF and wait for at least 10 seconds, then perform the next test.

>> GO TO 2.

2.CHECK DTC DETECTION

With CONSULT


  1. Start the engine and wait for at least 5 seconds.
  2. Check the DTC.

Is “U1000” detected? YES >> Go to TM-158, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

For the diagnosis procedure, refer to LAN-16, "Trouble Diagnosis Flow Chart".

U0155 Lost communication (IPC)
DTC Logic DTC DETECTION LOGIC DTC CONSULT screen terms [Trouble diagnosis content] DTC detection condition Possible causes U0155 LOST COMM (IPC) [Lost Communication ...

U1117 Lost communication (ABS)
DTC Logic DTC DETECTION LOGIC DTC CONSULT screen terms [Trouble diagnosis content] DTC detection condition Possible causes U1117 LOST COMM (ABS) [Lost Communication ...

Other materials:

Removal and installation
Combination meter Exploded view Combination meter Front cover Removal and installation Removal Remove cluster lid a. Refer to ip-19, "removal and installation". Remove the screws from the combination meter. Remove the combination meter. Disconnect the comb ...

Symptom diagnosis
The eco mode indicator lamp does not turn on Description The ECO mode indicator lamp does not turn ON when the ECO mode switch is operated. Diagnosis Procedure 1.Perform combination meter on board diagnosis Perform combination meter on board diagnosis. Refer to MWI-16, "Description" ...

Dtc/circuit diagnosis
U1000 can comm circuit DTC Logic Dtc detection logic Consult display Dtc detection condition Possible cause Can comm circuit [u1000] Av control unit is not transmitting or receiving can communication signal for 2 seconds or more. CAN communication system. ...

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