B2603

Description

BCM confirms the shift position with the following 4 signals.
- Selector lever
- Transmission range 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
Body Control System.
- If DTC B2603 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
Body Control System.
- If DTC B2603 is displayed with DTC B2601, first perform the trouble diagnosis for DTC B2601. Refer to
B2601.






DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and wait 1 second or more.
2.Check "Self-diagnosis result" using CONSULT-III.
Is DTC detected?
YES- Go to .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK DTC WITH TCM

Check "Self diagnosis result" with CONSULT-III.
Are any DTC detected?
YES- Testing and Inspection.
NO- GO TO 2.

2. CHECK TRANSMISSION RANGE SWITCH CIRCUIT 1

1.Turn ignition switch OFF.
2.Disconnect A/T assembly connector and BCM connector.
3.Check continuity between A/T assembly harness connector and BCM harness connector.





4.Check continuity between A/T assembly harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace harness.

3. CHECK TRANSMISSION RANGE SWITCH CIRCUIT 2

1.Disconnect TCM connector.
2.Check continuity between TCM harness connector and A/T assembly harness connector.





3.Check continuity between TCM harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair or replace harness.

4. CHECK A/T SHIFT SELECTOR POWER SUPPLY

1.Disconnect A/T shift selector (detention switch) connector.
2.Check voltage between A/T shift selector (detention switch) harness connector and ground.





Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.

5. CHECK A/T SHIFT SELECTOR POWER SUPPLY CIRCUIT

1.Disconnect BCM connector.
2.Check continuity between A/T shift selector (detention switch) harness connector and BCM harness connector.





3.Check continuity between A/T shift selector (detention switch) harness connector and ground.





Is the inspection result normal?
YES- Replace BCM. Removal and Installation.
NO- Repair or replace harness.

6. CHECK A/T SHIFT SELECTOR CIRCUIT

1.Disconnect BCM connector and IPDM E/R connector.
2.Check continuity between A/T shift selector (detention switch) harness connector and BCM harness connector.





3.Check continuity between A/T shift selector (detention switch) harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair or replace harness.

7. CHECK A/T SHIFT SELECTOR (DETENTION SWITCH)

B2601.
Is the inspection result normal?
YES- GO TO 8.
NO- Replace A/T shift selector. Removal and Installation.

8. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
- INSPECTION END