Nissan Sentra Service Manual: 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 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-73, "removal and installation".

B2614 acc relay circuit

Dtc logic

Dtc detection logic

Consult display	Dtc detecting condition	Possible cause
Acc relay circuit [b2614]	An immediate operation of accessory relay is requested by bcm, but there is no response for more than 1 second.	Harness or connectors Accessory relay-2 BCM

Dtc confirmation procedure

1.Perform dtc confirmation procedure

1. Turn ignition switch to ACC, and wait for 1 second or more.
2. Check “self-diagnosis result” of bcm with consult.

Is DTC detected? YES >> Go to PCS-82, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1.Check accessory relay-2 control signal

Check voltage between bcm connector m83 and ground.

Is the inspection result normal? YES >> Replace BCM. Refer to BCS-73, "Removal and Installation".

NO >> GO TO 2.

2.Check accessory relay-2 control signal circuit

1. Turn ignition switch off.
2. Disconnect BCM connector M83 and accessory relay-2.
3. Check continuity between bcm connector m83 and accessory relay-2 connector m65.

4. Check continuity between bcm connector m83 and ground.

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

No >> repair or replace harness.

3.Check accessory relay-2

Refer to pcs-83, "component inspection".

Is the inspection result normal? Yes >> replace bcm. Refer to bcs-73, "removal and installation".

No >> replace accessory relay-2.

Component inspection

1.Check accessory relay-2

1. Turn ignition switch off.
2. Remove accessory relay-2.
3. Check the continuity between accessory relay-2 terminals.

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

No >> replace accessory relay-2.

B2615 blower relay circuit

Dtc logic

Dtc detection logic

Consult display	Dtc detection condition	Possible cause
BLOWER RELAY CIRCUIT [B2615]	An immediate operation of front blower motor relay is requested by bcm, but there is no response for more than 1 second.	Harness or connectors. Front blower motor relay. Fuse block j/b. Bcm.

Dtc confirmation procedure

1.Perform dtc confirmation procedure

1. Turn ignition switch on, and wait for 1 second or more.
2. Check “self-diagnosis result” with consult.

Is dtc detected? Yes >> go to pcs-84, "diagnosis procedure".

No >> inspection end.

Diagnosis procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1. Check blower relay power supply circuit

1. Turn ignition switch OFF.
2. Disconnect blower relay.
3. Disconnect bcm connector m83.
4. Check continuity between blower relay connector J-1 and BCM connector M83.

5. Check continuity between blower relay connector j-1 and ground.

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace harness or connectors.

2. Check blower relay ground circuit

1. Check continuity between blower relay connector j-1 and ground.

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

No >> repair or replace harness or connectors.

3. Check blower motor relay

Perform the relay component inspection. Refer to pcs-85, "component inspection".

Is the inspection result normal? Yes >> go to 4.

No >> replace blower motor relay.

4. Check blower relay power supply (bcm)

Check voltage between bcm connector m83 and ground.

Is the inspection result normal? Yes >> refer to gi-39, "intermittent incident".

No >> replace bcm. Refer to bcs-73, "removal and installation".

Component inspection

1.Check blower relay

1. Turn blower switch OFF.
2. Remove blower relay.
3. Check the continuity between blower relay terminals.

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

No >> replace blower relay

B2616 ignition relay circuit

Dtc logic

Dtc detection logic

Consult display	Dtc detection condition	Possible cause
Ignition relay circuit [b2616]	An immediate operation of ignition relay-2 is requested by BCM, but there is no response for more than 1 second.	Harness or connectors. Ignition relay-2. Fuse block J/B. BCM.

Dtc confirmation procedure

1. Perform self diagnostic result

1. Turn ignition switch on under the following conditions, and wait for at least 1 second.

• Cvt selector lever is in the p (park) or n (neutral) position.
• Release brake pedal

2. Perform self diagnostic result.

Is dtc b2616 detected? Yes >> refer to pcs-86, "diagnosis procedure".

No >> inspection end.

Diagnosis procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1. Check ignition relay-2 power supply circuit

1. Turn ignition switch off.
2. Disconnect bcm connector m83.
3. Check continuity between ignition relay-2 connector j-3 and bcm connector m83.

4. Check continuity between ignition relay-2 connector j-3 and ground.

Is the inspection result normal? YES >> GO TO 2.

NO >> Repair or replace harness or connectors.

2. Check ignition relay-2 ground circuit

1. Check continuity between ignition relay-2 connector j-3 and ground.

Is the inspection result normal? YES >> GO TO 3.

No >> repair or replace harness or connectors.

3. Check ignition relay-2

Perform the relay component inspection. Refer to pcs-87, "component inspection".

Is the inspection result normal? Yes >> go to 4.

No >> replace ignition relay-2.

4. Check ignition relay-2 power supply (bcm)

Check voltage between bcm connector m83 and ground.

Is the inspection result normal? Yes >> refer to gi-39, "intermittent incident".

No >> replace bcm. Refer to bcs-73, "removal and installation".

Component inspection

1.Check ignition relay-2

1. Turn ignition switch OFF.
2. Remove ignition relay-2.
3. Check the continuity between ignition relay-2 terminals.

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

No >> replace ignition relay-2.

B2618 bcm

Dtc logic

Dtc detection logic

Note:

• If dtc b2618 is displayed with dtc u1000, first perform the trouble diagnosis for dtc u1000. Refer to pcs-80, "dtc logic".
• If dtc b2618 is displayed with dtc u1010, first perform the trouble diagnosis for dtc u1010. Refer to pcs-81, "dtc logic".

Consult display	Dtc detection condition	Possible cause
BCM [B2618]	An immediate operation of ignition relay-1 is requested by bcm, but there is no response for more than 1 second	Harness or connectors Bcm Ipdm e/r

Dtc confirmation procedure

1. Perform self diagnostic result

1. Turn ignition switch on under the following conditions, and wait for at least 1 second.

• Cvt selector lever is in the p (park) or n (neutral) position.
• Release brake pedal

2. Perform self diagnostic result.

Is dtc b2618 detected? Yes >> refer to pcs-88, "diagnosis procedure".

No >> inspection end.

Diagnosis procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1.Check ignition relay-1 control signal

Check voltage between bcm connector m83 and ground.

Is the inspection result normal? Yes >> replace bcm. Refer to bcs-73, "removal and installation".

No >> go to 2.

2.Check ignition relay-1 control signal circuit

1. Turn ignition switch off
2. Disconnect bcm connector m83 and ipdm e/r connector e39.
3. Check continuity between bcm connector m83 and ipdm e/r connector e39.

4. Check continuity between bcm connector m83 and ground.

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

No >> repair or replace harness.

3.Check voltage of ignition relay-1 control signal circuit (ipdm e/r side)

1. Connect ipdm e/r connector.
2. Check voltage between ipdm e/r connector e39 and ground.

Is the inspection result normal? Yes >> replace bcm. Refer to bcs-73, "removal and installation".

No >> replace ipdm e/r.

B261A push-button ignition switch

DTC Logic

Dtc detection logic

Consult display	Dtc detection condition	Possible cause
Push-button ignition switch [b261a]	Bcm detects a difference of signal for 1 second or more between the following information: Power supply position by push-button ignition switch. Power supply position from ipdm e/r (can).	Harness or connectors Push-button ignition switch Bcm

Dtc confirmation procedure

1. Perform self diagnostic result

1. Press the push-button ignition switch under the following conditions, and wait for at least 1 second.

• Cvt selector lever is in the p (park) or n (neutral) position.
• Release the brake pedal.

2. Perform self diagnostic result.

Is dtc b261a detected? Yes >> refer to pcs-90, "diagnosis procedure".

No >> inspection end.

Diagnosis Procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1. Check push-button ignition switch output signal (push-button ignition switch)

1. Disconnect push-button ignition switch connector.
2. Check voltage between push-button ignition switch connector m25 and ground.

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

No >> go to 4.

2. Check ignition switch output signal (ipdm e/r)

Check voltage between ipdm e/r connector e39 and ground.

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

No >> replace ipdm e/r. Refer to pcs-30, "removal and installation".

3. Check push-button ignition switch circuit (ipdm e/r)

1. Turn ignition switch off.
2. Disconnect IPDM E/R connector E39 and BCM connector M83.
3. Check continuity between ipdm e/r connector e39 and push-button ignition switch connector m25.

4. Check continuity between ipdm e/r connector e39 and ground.

Is the inspection result normal? Yes >> refer to gi-39, "intermittent incident".

No >> repair or replace harness or connectors.

4. Check ignition switch output signal (bcm)

Check voltage between BCM connector M83 and ground.

Is the inspection result normal? YES >> GO TO 5.

NO >> Replace BCM. Refer to BCS-73, "Removal and Installation".

5. Check push-button ignition switch circuit (bcm)

1. Turn ignition switch OFF.
2. Disconnect bcm connector m83 and ipdm e/r connector e39.
3. Check continuity between bcm connector m83 and push-button ignition switch connector m25.

4. Check continuity between BCM connector M83 and ground.

Is the inspection result normal? Yes >> refer to gi-39, "intermittent incident".

No >> repair or replace harness or connectors.

B26f1 ignition relay

Dtc logic

Dtc detection logic

Consult display	Dtc detecting condition	Possible cause
IGN RELAY OFF [B26F1]	BCM transmits the ignition relay control signal, but does not receive ignition switch ON signal (CAN) from IPDM E/R.	Harness or connectors Bcm Ipdm e/r

Dtc confirmation procedure

1.Perform dtc confirmation procedure

1. Turn ignition switch ON, and wait for 2 seconds or more.
2. Check “self-diagnosis result” with consult.

Is dtc detected? Yes >> go to pcs-92, "diagnosis procedure".

No >> inspection end.

Diagnosis procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1.Check ipdm e/r self-diagnostic result

1. Turn ignition switch on.
2. Erase the dtc of ipdm e/r.
3. Turn ignition switch off.
4. Turn ignition switch on and check the dtc again.

Is dtc detected? Yes >> repair or replace the malfunctioning part. Refer to pcs-20, "dtc index".

No >> go to 2.

2.Check ignition relay-1 control signal (ipdm e/r)

Check voltage between bcm connector m83 and ground.

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

No >> replace bcm. Refer to bcs-73, "removal and installation".

3.Check ignition relay-1 control signal circuit (ipdm e/r)

1. Turn ignition switch off.
2. Disconnect bcm connector m83 and ipdm e/r connector m39.
3. Check continuity between bcm connector m83 and ipdm e/r connector e39.

Is the inspection result normal?

Yes >> replace ipdm e/r. Refer to pcs-30, "removal and installation".

No >> repair or replace harness.

B26f2 ignition relay

Dtc logic

Dtc detection logic

Consult display	Dtc detecting condition	Possible cause
Ign relay on [b26f2]	BCM transmits the ignition relay control signal, but does not receive ignition switch ON signal (CAN) from IPDM E/R.	Harness or connectors BCM Ipdm e/r

Dtc confirmation procedure

1.Perform dtc confirmation procedure

1. Turn ignition switch ON, and wait for 2 seconds or more.
2. Check “self-diagnosis result” with consult.

Is DTC detected? YES >> Go to PCS-94, "Diagnosis Procedure".

NO >> Inspection End.

Diagnosis procedure

Regarding Wiring Diagram information, refer to PCS-70, "Wiring Diagram".

1.Check ipdm e/r self-diagnostic result

1. Turn ignition switch on.
2. Erase the dtc of ipdm e/r.
3. Turn ignition switch off.
4. Turn ignition switch on and check the dtc again.

Is DTC detected? YES >> Repair or replace the malfunctioning part. Refer to PCS-20, "DTC Index".

NO >> GO TO 2.

2.Check ignition relay-1 control signal (ipdm e/r)

1. Turn ignition switch off.
2. Check voltage between IPDM E/R connector E39 and ground.

Is the inspection result normal? Yes >> replace ipdm e/r.

No >> go to 3.

3.Check ignition relay-1 control signal circuit - 1 (ipdm e/r)

1. Turn ignition switch off.
2. Disconnect bcm connector m83 and ipdm e/r connector e39.
3. Check continuity between ipdm e/r connector e39 and ground.

Is the inspection result normal?

Yes >> go to 4.

No >> repair or replace harness.

4.Check ignition relay-1 control signal circuit - 2 (ipdm e/r)

1. Connect ipdm e/r connector e39.
2. Check voltage between ipdm e/r connector e39 and ground.

Is the inspection result normal? Yes >> replace bcm. Refer to bcs-73, "removal and installation".

No >> replace ipdm e/r. Refer to pcs-30, "removal and installation".

B26f6 bcm

DTC Logic

Dtc detection logic

Note:

• If dtc b26f6 is displayed with dtc u1000, first perform the trouble diagnosis for dtc u1000. Refer to pcs-80, "dtc logic".
• If dtc b26f6 is displayed with dtc u1010, first perform the trouble diagnosis for dtc u1010. Refer to pcs-81, "dtc logic".

Consult display	Dtc detection condition	Possible cause
Bcm [b26f6]	Ignition relay ON signal is not transmitted from IPDM E/R (CAN) when BCM turns ignition relay ON.	Bcm

Dtc confirmation procedure

1.Perform dtc confirmation procedure

1. Turn ignition switch on, and wait for 0.5 Seconds or more.
2. Check “Self-diagnosis result” of BCM with CONSULT.

Is dtc detected? Yes >> go to pcs-96, "diagnosis procedure".

No >> inspection end.

Diagnosis Procedure

Regarding wiring diagram information, refer to pcs-70, "wiring diagram".

1. Check self diagnostic result for ipdm e/r

Perform self diagnostic result for IPDM E/R.

Are any DTCs detected? YES >> Refer to PCS-20, "DTC Index".

NO >> GO TO 2

2. Check ignition relay-1 power supply (ipdm e/r)

Check voltage between ipdm e/r connector e39 and ground.

Is the inspection result normal? YES >> Replace IPDM E/R. Refer to PCS-30, "Removal and Installation".

NO >> GO TO 3.

3. Check ignition relay-1 power supply (bcm)

Check voltage between bcm connector m83 and ground.

Is the inspection result normal? Yes >> refer to gi-39, "intermittent incident".

No >> replace bcm. Refer to bcs-73, "removal and installation".

Push-button ignition switch

Component function check

1.Check function

1. Select “PUSH SW” in “Data Monitor” of BCM with CONSULT.
2. Check the push-button ignition switch signal under the following conditions.

Is the indication normal? Yes >> inspection end.

No >> go to pcs-98, "diagnosis procedure".

Diagnosis procedure

Regarding Wiring Diagram information, refer to PCS-70, "Wiring Diagram".

1. Check push-button ignition switch output signal (push-button ignition switch)

1. Turn ignition switch OFF.
2. Disconnect push-button ignition switch connector and ipdm e/r connector e39.
3. Check voltage between push-button ignition switch connector M25 and ground.

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

No >> go to 2.

2. Check push-button ignition switch circuit (bcm)

1. Disconnect bcm connector m83.
2. Check continuity between bcm connector m83 and push-button ignition switch connector m25.

3. Check continuity between bcm connector m83 and ground.

Is the inspection result normal? Yes >> replace bcm. Refer to bcs-73, "removal and installation".

No >> repair or replace harness or connectors.

3. Check ignition switch output signal (ipdm e/r)

Check voltage between ipdm e/r connector e39 and ground.

Is the inspection result normal? Yes >> go to 5.

No >> go to 4.

4. Check push-button ignition switch circuit (ipdm e/r)

1. Disconnect bcm connector m83.
2. Check continuity between ipdm e/r connector e39 and push-button ignition switch connector m25.

3. Check continuity between IPDM E/R connector E39 and ground.

Is the inspection result normal? Yes >> replace ipdm e/r. Refer to pcs-30, "removal and installation".

No >> repair or replace harness or connectors.

5.Check push-button ignition switch ground circuit

Check continuity between push-button ignition switch connector M25 and ground.

Is the inspection result normal? YES >> GO TO 6.

NO >> Repair or replace harness or connectors.

6.Check push-button ignition switch

Refer to pcs-99, "component inspection".

Is the inspection result normal? Yes >> refer to gi-39, "intermittent incident".

No >> replace push-button ignition switch. Refer to pcs-102, "removal and installation".

Component inspection

1.Check push-button ignition switch

1. Turn ignition switch OFF.
2. Disconnect push-button ignition switch connector.
3. Check continuity between push-button ignition switch terminals.

Is the inspection result normal? YES >> Inspection End.

No >> replace push-button ignition switch.