CAN Communication System: Overview Toyota 4Runner IV рестайлинг

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1. HANDLING PRECAUTIONS ON STEERING SYSTEM Care must be taken when replacing parts. Incorrect replacement could affect the performance of the steering system and result in hazardous driving.
2. HANDLING PRECAUTIONS ON SRS AIRBAG SYSTEM This vehicle is equipped with an SRS (Supplemental Restraint System), such as the driver airbag and front passenger airbag. Failure to carry out service operation in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notice for the supplemental restraint system (See «PRECAUTION»(/toyota/4runner/iv-2005-2009/remont/airbag/#supplemental-restraint-system) ).
3. WIRE HARNESS REPAIR After repairing the wire bus line with solder, wrap the repaired part with vinyl tape. NOTE: The CANL bus line and CANH bus line must be installed together all the time. When installing, make sure to twist them. The difference in length of the CANL bus line and CANH bus line should be within 100 mm (3.93 in). Untwisted parts around the connector should be within 80 mm (3.15 in). Do not perform bypass wiring between the connectors. NOTE: If you perform bypass wiring, the characteristic of the twisted wire harness will be lost.
4. CONNECTOR HANDLING When inserting tester probes into a connector, insert them from the back of the connector. If it is impossible to check resistance from the back of the connector, use a repair wire to check it.

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HINT

1. The skid control ECU stores DTCs and performs DTC communication by receiving information from the steering angle sensor and yaw rate sensor. These sensors cannot store DTCs or perform DTC communication.
2. The ECM uses the CAN communication system to perform DTC communication instead of the conventional serial communication line (SIL).

SYSTEM DESCRIPTION

1. BRIEF DESCRIPTION CAN (Controller Area Network) is a serial data communication system for real time application. It is a vehicle multiplex communication system which has a high communication speed (500 kbps) and the ability to detect malfunctions. The CAN performs the communication based on the differential voltage by pairing the CANH bus line and CANL bus line. This vehicle uses the CAN communication system for communication between the following ECU and sensors in the ABS with EBD & BA & TRC & VSC system. The CAN has two resistors of 120 ohms, that are necessary for communication to the main bus line.
2. DEFINITION OF TERMS Main bus line Main bus line is a wire harness between the two terminus circuits on the bus (communication line). This is the main bus in the CAN communication system. Sub bus line Sub bus line is a wire harness which diverges from the main bus line, which is the main bus of the CAN bus, to an ECU or sensor.
3. ECU OR SENSORS WHICH COMMUNICATE THROUGH THE CAN COMMUNICATION SYSTEM Skid Control ECU Steering Angle Sensor Yaw Rate Sensor ECM
4. DIAGNOSTIC CODES FOR THE CAN COMMUNICATION SYSTEM DTCs for the CAN communication system are as follows: U0073/94, U0123/62, U0124/95, U0126/63, U0100/65
5. REMARKS FOR TROUBLESHOOTING Trouble in the CAN bus (communication line) can be checked from the DLC3 (except a wire break other than in the DLC3 sub bus line). The CAN communication system cannot detect trouble in the DLC3 sub bus line even though the DLC3 is also connected to the CAN communication system.
6. HOW TO DISTINGUISH THE J/C CONNECTOR In the CAN communication system, all connected to the CAN J/C are the same shape. The connectors connected to the CAN J/B can be distinguished by the colors of the bus lines and the connecting side of the connector. HINT: See "TERMINALS OF ECU" for bus line colors or the type of connecting surface (See «TERMINALS OF ECU»(ref-280583-S00128961782008022200000) ).

DESCRIPTION

SYMPTOM CHART

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1. CHECK CAN BUS LINE FOR DISCONNECTION (SKID CONTROL ECU SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the skid control ECU connector (S28). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value S28-11 (CANH) - S28-25 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP
2. CHECK WIRE HARNESS (IG, GND2) Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value S28-32 (GND2) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage CONNECTOR TERMINAL VOLTAGE SPECIFICATION Tester connection Condition Specified value S28-46 (IG1) - Body ground IG switch ON 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE MASTER CYLINDER SOLENOID

SYMPTOM CHART

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1. CHECK CAN BUS LINE FOR DISCONNECTION (STEERING ANGLE SENSOR SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the steering angle sensor connector (S11). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value S11-3 (CANH) - S11-11 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms NG: REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP
2. CHECK WIRE HARNESS (IG1, ESS) Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value S11-2 (ESS) - Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage CONNECTOR TERMINAL VOLTAGE SPECIFICATION Tester connection Condition Specified value S11-1 (IGI) - Body ground IG switch ON 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE STEERING ANGLE SENSOR

SYMPTOM CHART

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1. CHECK CAN BUS LINE FOR DISCONNECTION (YAW RATE SENSOR SUB BUS LINE) Turn the ignition switch to the LOCK position. Disconnect the yaw rate sensor connector (Y1). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value Y1-2 (CANL) - Y1-3 (CANH) IG switch OFF Stop light switch OFF 54 to 69 ohms NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP
2. CHECK WIRE HARNESS (IG, GND) Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value Y1-1 (GND) -Body ground Always Below 1 ohms Measure the voltage according to the value(s) in the table below. Standard voltage CONNECTOR TERMINAL VOLTAGE SPECIFICATION Tester connection Condition Specified value Y1-5 (IG) - Body ground IG switch ON 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE YAW RATE SENSOR

When any DTC of the CAN communication system is output, first measure the resistance between the terminals of the DLC3 and the yaw rate sensor connector to specify the trouble area.

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1. CHECK CAN BUS WIRE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT) Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value Result D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms OK D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 69 ohms or higher NG-A D1-6 (CANH) - D1 -14 (CANL) IG switch OFF Stop light switch OFF Below 54 ohms NG-B NG-A: CHECK CAN MAIN BUS LINE FOR DISCONNECTION NG-B: CHECK CAN BUS LINES FOR SHORT CIRCUIT OK: GO TO NEXT STEP
2. CHECK CAN BUS LINE FOR SHORT TO +B Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-16 (BAT) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-14 (CANL) - D1-16 (BAT) IG switch OFF Stop light switch OFF 1 Mohms or higher NG: CHECK CAN BUS LINE FOR SHORT TO +B OK: GO TO NEXT STEP
3. CHECK CAN BUS LINE FOR SHORT TO GND Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-4 (CG) - D1-6 (CANH) 16 switch OFF Stop light switch OFF 3 kohms or higher DM (CG) - D1-14 (CANL) IG switch OFF Stop light switch OFF 3 kohms or higher NG: CHECK CAN BUS LINE FOR SHORT TO GND OK: GO TO «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-280583-S39967612992008022200000)

The CAN main bus line and DLC3 sub bus line may have a disconnection when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is more than 69 ohms.

SYMPTOM CHART

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1. CHECK DLC3 Measure the resistance according to the value(s) in the table below. Result CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value Result D1-6 (CANH) - D1-14 (CANL) 16 switch OFF Stop light switch OFF 108 to 132 ohms A D1-6 (CANH) -D1-14 (CANL) IG switch OFF Stop light switch OFF 132 ohms or higher B NOTE: When the measured value is 132 ohms or more and a CAN communication system diagnostic code is output, there may be a fault other than a disconnection of the DLC3 sub bus line. For that reason, troubleshooting should be performed again from "How to Proceed with Troubleshooting" after repairing the trouble area. B: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) A: GO TO NEXT STEP
2. CHECK CAN MAIN BUS LINE FOR DISCONNECTION (ECM - CAN J/C) Disconnect the connector (E7) from the ECM. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value E7-33 (CANH) - E7-34 (CANL) IG switch OFF Stop light switch OFF 108 to 132 ohms OK: REPLACE ECM NG: GO TO NEXT STEP
3. CHECK CAN J/C Disconnect the CAN main bus line connector (J51) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Between the terminals where the connector (J51) was connected Condition Specified value CANH-CANL IG switch OFF Stop light switch OFF 108 to 132 ohms NG: REPLACE CAN J/C OK: REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN J/C - ECM)

The CAN bus lines are considered to be shorted when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 ohms.

SYMPTOM CHART

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1. CHECK CAN BUS LINES FOR SHORT CIRCUIT (DLC3 SUB BUS LINE) Disconnect the DLC3 sub bus line connector (J50) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or more NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP
2. CONNECT CONNECTOR Reconnect the DLC3 sub bus line connector (J50) to the CAN J/C.
3. CHECK CAN BUS LINES FOR SHORT CIRCUIT (SKID CONTROL ECU SUB BUS LINE) Disconnect the skid control ECU sub bus line connector (J47) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) 16 switch OFF Stop light switch OFF 54 to 69 ohms OK: Go to step 10 NG: GO TO NEXT STEP
4. CONNECT CONNECTOR Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
5. CHECK CAN BUS LINES FOR SHORT CIRCUIT (YAW RATE SENSOR SUB BUS LINE) Disconnect the yaw rate sensor sub bus line connector (J48) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms OK: Go to step 12 NG: GO TO NEXT STEP
6. CONNECT CONNECTOR Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.
7. CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING ANGLE SENSOR SUB BUS LINE) Disconnect the steering angle sensor sub bus line connector (J49) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms OK: Go to step 14 NG: GO TO NEXT STEP
8. CONNECT CONNECTOR Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
9. CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM MAIN BUS LINE) Disconnect the ECM main bus line connector (J51) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 108 to 132 ohms OK: Go to step 16 NG: REPLACE CAN J/C
10. CONNECT CONNECTOR Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
11. CHECK CAN BUS LINES FOR SHORT CIRCUIT (SKID CONTROL ECU SUB BUS LINE) Disconnect the skid control ECU connector (S28). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms OK: REPLACE MASTER CYLINDER SOLENOID NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
12. CONNECT CONNECTOR Reconnect the yaw rate sensor sub bus line connector (J48)to the CANJ/C.
13. CHECK CAN BUS LINES FOR SHORT CIRCUIT (YAW RATE SENSOR SUB BUS LINE) Disconnect the yaw rate sensor connector (Y1). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms OK: REPLACE YAW RATE SENSOR NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR
14. CONNECT CONNECTOR Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
15. CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING ANGLE SENSOR SUB BUS LINE) Disconnect the steering angle sensor connector (S11). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms OK: REPLACE STEERING ANGLE SENSOR NG: REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
16. CONNECT CONNECTOR Reconnect the ECM main bus line connector (J51) to the CAN J/C.
17. CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM MAIN BUS LINE) Disconnect the ECM connector (E7). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-6 (CANH) - D1-14 (CANL) IG switch OFF Stop light switch OFF 108 to 132 ohms OK: REPLACE ECM NG: REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)

A short to +B is suspected in the CAN bus Iine when there is continuity between terminals 16 (BAT) and 6 (CANH) or terminals 16 (BAT) and 14 (CANL) of the DLC3.

SYMPTOM CHART

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1. CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 SUB BUS LINE) Disconnect the DLC3 sub bus line connector (J50) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP
2. CONNECT CONNECTOR Reconnect the DLC3 sub bus line connector (J50) to the CAN J/C.
3. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE) Disconnect the skid control ECU sub bus line connector (J47) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: Go to step 10 NG: GO TO NEXT STEP
4. CONNECT CONNECTOR Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
5. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB BUS LINE) Disconnect the yaw rate sensor sub bus line connector (J48) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) 16 switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: Go to step 12 NG: GO TO NEXT STEP
6. CONNECT CONNECTOR Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.
7. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING ANGLE SENSOR SUB BUS LINE) Disconnect the steering angle sensor sub bus line connector (J49) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: Go to step 14 OK: GO TO NEXT STEP
8. CONNECT CONNECTOR Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
9. CHECK CAN BUS LINE FOR SHORT TO +B (ECM MAIN BUS LINE) Disconnect the ECM connector (E7). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: REPLACE ECM NG: REPAIR OR REPLACE ECM MAIN BUS LINE OR CONNECTOR (CAN-H, CAN-L)
10. CONNECT CONNECTOR Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
11. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU SUB BUS LINE) Disconnect the skid control ECU connector (S28). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value O1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: REPLACE MASTER CYLINDER SOLENOID NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
12. CONNECT CONNECTOR Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.
13. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR SUB BUS LINE) Disconnect the yaw rate sensor connector (Y1). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: REPLACE YAW RATE SENSOR NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)
14. CONNECT CONNECTOR Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
15. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING ANGLE SENSOR SUB BUS LINE) Disconnect the steering angle sensor connector (S11). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value D1-16 (BAT) - D1-6 (CANH) IG switch OFF Stop light switch OFF 1 Mohms or higher D1-16 (BAT) - D1-14 (CANL) IG switch OFF Stop light switch OFF 1 Mohms or higher OK: REPLACE STEERING ANGLE SENSOR NG: REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

A short to GND is suspected in the CAN bus line when there is continuity between terminals 4 (CG) and 6 (CANH) or terminals 4 (CG) and 14 (CANL) of the DLC3.

SYMPTOM CHART

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If 2 or more ECUs and/or sensors do not appear on the intelligent tester's "BUS CHECK" screen via the CAN VIM, one side of the CAN sub-bus line may be open. (One side of the CAN-H [sub-bus Iine]/CAN-L [sub-bus line] of the ECU and/or sensor is open.)

SYMPTOM CHART

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1. CHECK OPEN IN ONE SIDE OF CAN SUB BUS LINE (SKID CONTROL ECU SUB BUS LINE) Disconnect the skid control ECU sub bus line connector (J47) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Connect the intelligent tester via the CAN VIM to the DLC3. Turn the ignition switch ON. Select "BUS CHECK" on the intelligent tester display via the CAN VIM (See «DIAGNOSIS SYSTEM»(ref-280583-S12226630702008022200000) ). Result RESULT REFERENCE Proceed to Result A "ABS/VSC/TRAC" does not appear B 2 or more ECUs and/or sensors do not appear A: Go to step 8 B: GO TO NEXT STEP
2. CONNECT CONNECTOR Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
3. CHECK OPEN IN ONE SIDE OF CAN SUB BUS LINE (STEERING ANGLE SENSOR SUB BUS LINE) Disconnect the steering angle sensor sub bus line connector (J49) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Connect the intelligent tester via the CAN VIM to the DLC3. Turn the ignition switch ON. Select "BUS CHECK" on the intelligent tester display via the CAN VIM (See «DIAGNOSIS SYSTEM»(ref-280583-S12226630702008022200000) ). Result RESULT REFERENCE Proceed to Result A "STEERING SENSOR" does not appear B 2 or more ECUs and/or sensors do not appear A: Go to step 10 B: GO TO NEXT STEP
4. CONNECT CONNECTOR Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
5. CHECK OPEN IN ONE SIDE OF CAN SUB BUS LINE (YAW RATE SENSOR SUB BUS LINE) Disconnect the yaw rate sensor sub bus line connector (J48) from the CAN J/C. NOTE: Before disconnecting the connector, make a note of where it is connected. Reconnect the connector to its original position. Connect the intelligent tester via the CAN VIM to the DLC3. Turn the ignition switch ON. Select "BUS CHECK" on the intelligent tester display via the CAN VIM (See «DIAGNOSIS SYSTEM»(ref-280583-S12226630702008022200000) ). Result RESULT REFERENCE Proceed to Result A "YAW/DECELERAT" does not appear B 2 or more ECUs and/or sensors do not appear B: Go to step 12 A: GO TO NEXT STEP
6. CONNECT CONNECTOR Reconnect the yaw rate sensor sub bus line connector (J48) to the CAN J/C.
7. CHECK OPEN IN ONE SIDE OF CAN BUS LINE (YAW RATE SENSOR SUB BUS LINE) Disconnect the yaw rate sensor connector (Y1). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value Y1-2 (CANL) - Y1-3 (CANH) IG switch OFF Stop light switch OFF 54 to 69 ohms NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE YAW RATE SENSOR
8. CONNECT CONNECTOR Reconnect the skid control ECU sub bus line connector (J47) to the CAN J/C.
9. CHECK OPEN IN ONE SIDE OF CAN SUB BUS LINE (SKID CONTROL ECU SUB BUS LINE) Disconnect the skid control ECU connector (S28). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value S28-11 (CANH) - S28-25 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms NG: REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE MASTER CYLINDER SOLENOID
10. CONNECT CONNECTOR Reconnect the steering angle sensor sub bus line connector (J49) to the CAN J/C.
11. CHECK OPEN IN ONE SIDE OF CAN SUB BUS LINE (STEERING ANGLE SENSOR SUB BUS LINE) Disconnect the steering angle sensor connector (S11). Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value S11-3 (CANH) - S11-11 (CANL) IG switch OFF Stop light switch OFF 54 to 69 ohms NG: REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: REPLACE STEERING ANGLE SENSOR
12. CHECK CAN J/C Disconnect connectors (J47), (J48), (J49), (J50) and (J51) from the CAN J/C. Measure the resistance according to the value(s) in the table below. Standard resistance CONNECTOR TERMINAL RESISTANCE SPECIFICATION Tester connection Condition Specified value 1 (CANH) - 2 (CANL) IG switch OFF Stop light switch OFF 108 to 132 ohms NG: REPLACE CAN J/C OK: REPLACE ECM

See also:
• PRECAUTION