Open in One Side of CAN Sub Bus Line
CAN COMMUNICATION SYSTEM: Open in One Side of CAN Sub Bus Line
Open in One Side of CAN Sub Bus Line
DESCRIPTION
If 2 or more ECUs and/or sensors do not appear on the Techstream "CAN Bus Check" screen, one side of the CAN sub-bus line may be open. (ONE side of the CAN-H [sub-bus line] / CAN-L [sub-bus line] of the ECU and/or sensor is open.)
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE (SKID CONTROL ECU SUB BUS LINE)
(a) Disconnect the skid control ECU sub bus line connector (J6) from the CAN J/C.
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch ON.
(d) Select "CAN Bus Check" on the Techstream display (Diagnosis System).
Result
A -- CONNECT CONNECTOR
B -- Continue to next step.
2. CONNECT CONNECTOR
(a) Reconnect the skid control ECU sub bus line connector (J6) to the CAN J/C.
NEXT -- Continue to next step.
3. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE (STEERING ANGLE SENSOR SUB BUS LINE)
(a) Disconnect the steering angle sensor sub bus line connector (J8) from the CAN J/C.
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch ON.
(d) Select "CAN Bus Check" on the Techstream display (Diagnosis System).
Result
A -- CONNECT CONNECTOR
B -- Continue to next step.
4. CONNECT CONNECTOR
(a) Reconnect the steering angle sensor sub bus line connector (J8) CAN J/C.
NEXT -- Continue to next step.
5. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE (YAW RATE SENSOR SUB BUS LINE)
(a) Disconnect the yaw rate sensor sub bus line connector (J7) from the CAN J/C.
- Before disconnecting the connector, make a note of where it is connected.
- Reconnect the connector to its original position.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch ON.
(d) Select "CAN Bus Check" on the Techstream display (Diagnosis System).
Result
B -- INSPECT CAN J/C
A -- Continue to next step.
6. CONNECT CONNECTOR
(a) Reconnect the yaw rate sensor sub bus line connector (J7) to the CAN J/C.
NEXT -- Continue to next step.
7. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE (YAW RATE SENSOR SUB BUS LINE)
(a) Disconnect the yaw rate sensor connector (Y1).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H or CAN-L)
OK -- REPLACE YAW RATE SENSOR
8. CONNECT CONNECTOR
(a) Reconnect the skid control ECU sub bus line connector (J6) to the CAN J/C.
NEXT -- Continue to next step.
9. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE (SKID CONTROL ECU SUB BUS LINE)
(a) Disconnect the skid control ECU connector (S1).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE SKID CONTROL ECU BRANCH WIRE OR CONNECTOR (CAN-H or CAN-L)
OK -- REPLACE MASTER CYLINDER SOLENOID
10. CONNECT CONNECTOR
(a) Reconnect the steering angle sensor sub bus line connector (J8) to the CAN J/C.
NEXT -- Continue to next step.
11. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE (STEERING ANGLE SENSOR SUB BUS LINE)
(a) Disconnect steering angle sensor connector (S9).
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE STEERING ANGLE SENSOR BRANCH WIRE OR CONNECTOR (CAN-H or CAN-L)
OK -- REPLACE STEERING ANGLE SENSOR
12. INSPECT CAN J/C
(a) Disconnect connectors (J6), (J7), (J8), (J9), and (J10) from the CAN J/C.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE CAN J/C
OK -- REPLACE ECM