Nissan Maxima Service and Repair Manual: B2603 shift position status

Description

BCM confirms the shift position with the following 2 signals.

•  CVT selector lever

•  P/N position switch

DTC Logic

DTC DETECTION LOGIC

NOTE:

• If DTC B2603 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to SEC-29, "DTC Logic".

• If DTC B2603 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to SEC-30, "DTC Logic".

DTC CONFIRMATION PROCEDURE

1.PERFORM DTC CONFIRMATION PROCEDURE

1.  Start the engine under the following conditions and wait for at least 1 second.

   •  CVT selector lever is in the P position.

   •  Do not depress the brake pedal.

2.  Shift to N and wait for at least 1 second.

3.  Shift to any gear other than P or N and wait for at least 1 second.

4.  Check "Self diagnostic result" with CONSULT.

Diagnosis Procedure

Regarding Wiring Diagram information, refer to SEC-147, "Wiring Diagram" or SEC-128, "Wiring Diagram".

1.CHECK DTC WITH IPDM E/R

Check "Self diagnostic result" with CONSULT. Refer to PCS-27, "DTC Index".

2.CHECK TRANSMISSION RANGE SWITCH CIRCUIT

1.  Turn ignition switch OFF.

2.  Disconnect TCM harness connector and BCM harness connector.

3.  Check continuity between TCM harness connector F15 (A) terminal 20 and BCM harness connector M18 (B) terminal 48.

4. Check continuity between TCM harness connector F15 (A) terminal 20 and ground.

3.CHECK CVT SHIFT SELECT POWER SUPPLY

1.  Turn ignition switch OFF.

2.  Disconnect CVT shift selector harness connector.

3.  Check voltage between CVT shift selector harness connector M78 terminal 8 and ground.

4.CHECK CVT SHIFT SELECTOR POWER SUPPLY CIRCUIT

1.  Disconnect BCM harness connector.

2.  Check continuity between BCM harness connector M19 (A) terminal 84 and CVT shift selector harness connector M78 (B) terminal 8.

3. Check continuity between BCM harness connector M19 (A) terminal 84 and ground.

5.CHECK CVT SHIFT SELECTOR CIRCUIT

1.  Disconnect BCM harness connector.

2.  Check continuity between BCM harness connector M19 (A) terminal 87 and CVT shift selector harness connector M78 (B) terminal 9.

3. Check continuity between BCM harness connector M19 (A) terminal 87 and ground.

6.CHECK CVT SHIFT SELECTOR

Refer to SEC-52, "Component Inspection".

7.CHECK INTERMITTENT INCIDENT

Refer to GI-41, "Intermittent Incident".

 Inspection End.