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Nissan Sentra Service Manual: Dtc/circuit diagnosis

Nissan Sentra Service Manual / Electrical & power control / Body control system / Without intelligent key system / Dtc/circuit diagnosis

U1000 can comm

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 symptoms and a present dtc by performing the self diagnostic result procedure.

Consult display

 Dtc detection condition

 Possible cause
Can comm circuit [u1000] When any listed module cannot communicate with can communication signal continuously for 2 seconds or more with ignition switch on In CAN communication system, any item (or items) of the following listed below is malfunctioning.
  • Transmission
  • Receiving (ecm)
  • Receiving (vdc/tcs/abs)
  • Receiving (meter/m&a)
  • Receiving (tcm)
  • Receiving (ipdm e/r)

Diagnosis procedure

1. Perform self diagnostic result

  1. Turn ignition switch ON and wait for 2 second or more.
  2. Check “self- diag results”.

Is “can comm circuit” displayed? Yes >> perform can diagnosis as described in diagnosis section of consult operation manual.

No >> refer to gi-39, "intermittent incident".

U1010 control unit (can)

Dtc logic

Dtc detection logic

Consult display

 Dtc detection condition

 Possible cause
Control unit (can) [u1010] Bcm detected internal can communication circuit malfunction. Bcm

Diagnosis procedure

1.Replace bcm

When dtc “u1010” is detected, replace bcm.

>> Replace bcm. Refer to bcs-126, "removal and installation".

Power supply and ground circuit

Diagnosis procedure

Regarding wiring diagram information, refer to bcs-111, "wiring diagram".

1.Check fuses and fusible link

Check that the following fuses and fusible link are not blown.

Is the fuse blown?


Is the fuse blown? Yes >> replace the blown fuse or fusible link after repairing the affected circuit.

No >> go to 2.

2.Check power supply circuit

  1. Turn ignition switch off.
  2. Disconnect bcm connectors.
  3. Check voltage between bcm connector and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 3.

No >> repair harness or connector.

3.Check ground circuit

Check continuity between bcm connector and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> inspection end.

No >> repair harness or connector.

Combination switch input circuit

Diagnosis procedure

Regarding wiring diagram information, refer to bcs-111, "wiring diagram".

1.Check input 1 - 5 circuit for open

  1. Turn ignition switch OFF.
  2. Disconnect bcm and combination switch connectors.
  3. Check continuity between BCM connector and combination switch connector.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 2.

No >> repair harness or connectors.

2.Check input 1 - 5 circuit for short

Check for continuity between bcm connector and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> repair harness or connectors.

No >> go to 3.

3.Check bcm output voltage

  1. Connect BCM connector.
  2. Check voltage between bcm connector and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> replace combination switch.

No >> replace bcm. Refer to bcs-126, "removal and installation".

Combination switch output circuit

Diagnosis procedure

Regarding Wiring Diagram information, refer to BCS-111, "Wiring Diagram".

1.Check output 1 - 5 circuit for open

  1. Turn ignition switch off.
  2. Disconnect bcm and combination switch connectors.
  3. Check continuity between bcm connector and combination switch connector.

Is the inspection result normal?


Is the inspection result normal? Yes >> go to 2.

No >> repair harness or connectors.

2.Check output 1 - 5 circuit for short

Check for continuity between bcm connector and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> repair harness or connectors.

No >> go to 3.

3.Check bcm input signal

  1. Connect BCM and combination switch connectors.
  2. Turn on any switch in the system that is malfunctioning.
  3. Check voltage between bcm connector and ground.

Is the inspection result normal?


Is the inspection result normal? Yes >> replace bcm. Refer to bcs-126, "removal and installation".

No >> replace combination switch.

Basic inspection
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Engine control system
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