B2603

B2603 SHIFT POSITION STATUS





Description
BCM confirms the shift position with the following 4 signals.
- Selector lever
- P/N position switch
- P position signal from IPDM E/R (CAN)
- P position signal from TCM (CAN)




DTC Logic

DTC DETECTION LOGIC

NOTE:
- If DTC B2603 is displayed with DTC U1000, first perform the trouble diagnosis for DTC U1000. Refer to Security System.
- If DTC B2603 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to Security System.

DTC Detection Logic:

DTC CONFIRMATION PROCEDURE
1.PERFORM DTC CONFIRMATION PROCEDURE
1. Start the engine under the following conditions and wait for at least 1 second.
- Selector lever is in the P position.
- Do not depress the brake pedal.
2. Check "Self diagnostic result" with CONSULT-III.
Is DTC detected?
YES - Go to B2603.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK DTC WITH TCM
Check "Self diagnostic result" with CONSULT-III. Refer to Testing and Inspection (VQ35HR) or refer to Testing and Inspection (VK50VE).
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace the malfunctioning parts.
2.CHECK PNP SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect A/T assembly connector and BCM connector M123.
3. Check continuity between TCM harness connector and BCM harness connector.





4. Check continuity between TCM harness connector and ground.





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace harness.
3.CHECK CONTROL DEVICE POWER SUPPLY
1. Disconnect control device (detention switch) connector.
2. Check voltage between control device (detention switch) harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.CHECK CONTROL DEVICE POWER SUPPLY CIRCUIT
1. Disconnect BCM connector M122.
2. Check continuity between control device (detention switch) harness connector and BCM harness connector.





3. Check continuity between control device (detention switch) harness connector and ground.





Is the inspection result normal?
YES - Replace BCM. Refer to Removal and Installation.
NO - Repair or replace harness.
5.CHECK CONTROL DEVICE CIRCUIT
1. Disconnect BCM connector M122 and IPDM E/R connector E6.
2. Check continuity between control device (detention switch) harness connector and BCM harness connector.





3. Check continuity between control device (detention switch) harness connector and ground.





Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace harness.
6.CHECK CONTROL DEVICE (DETENTION SWITCH)
Is the inspection result normal?
YES - GO TO 7.
NO - Replace control device. Refer to Removal and Installation (VQ35HR) or (VK50VE).
7.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
- INSPECTION END