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
"DTC Logic" Body Control System.
- If DTC B2603 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer to
"DTC Logic" Body Control System.
- If DTC B2603 is displayed with DTC B2601, first perform the trouble diagnosis for DTC B2601. Refer to
"DTC Logic" 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.
Is DTC detected?
YES- Go to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK DTC WITH TCM

Check "Self diagnosis result" with CONSULT.
Are any DTC detected?
YES- Refer to "DTC Index" 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. Refer to "Removal and Installation" 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)

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

8. CHECK INTERMITTENT INCIDENT

Refer to "Intermittent Incident" Intermittent Incident.
- INSPECTION END