CAN Communication System - Diagnostics: Diagnosis Toyota Matrix E130

HOW TO PROCEED WITH TROUBLESHOOTING

Note. When DTCs other than U0073/94, U0123/62, U0124/95, and U0126/63 are output, inspect and repair the trouble areas indicated by the DTCs.

1. CHECK CAN BUS LINE (SEE «CHECK CAN BUS LINE»(ref-225894-S24583713032006032300000) ) NEXT: Go to next step
2. CHECK AND CLEAR DTCs HINT: When checking the DTCs for the skid control ECU, see «DTC CHECK/CLEAR»(ref-225879-S31274056632006032300000) . NEXT: Go to next step
3. CHECK DTC COMBINATION TABLE (SEE «DIAGNOSTIC TROUBLE CODE CHART»(ref-225894-S40726277202006032300000) ) NEXT: Go to next step
4. CIRCUIT INSPECTION NEXT: Go to next step
5. IDENTIFICATION OF PROBLEM NEXT: Go to next step
6. REPAIR OR REPLACE NEXT: Go to next step
7. CONFIRMATION TEST NEXT: Go to next step END

CIRCUIT DESCRIPTION

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

Scheme 6

Scheme 7

Scheme 8

Scheme 9

Scheme 10

1. CHECK CAN BUS LINE (MAIN BUS LINE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT) Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (1 OF 4) Tester connection Condition Specified value Result D1-6(CANH)-D1-14(CANL) IG switch OFF 54 to 69 ohm OK D1-6(CANH)-D1-14(CANL) IG switch OFF 69 ohm or higher NG-A D1-6(CANH)-D1-14(CANL) IG switch OFF Below 54 ohm NG-B NG-A: CHECK CAN MAIN BUS LINE FOR DISCONNECTION (SEE «CHECK CAN MAIN BUS LINE FOR DISCONNECTION»(ref-225894-S05321377062006032300000) ) NG-B: CHECK CAN BUS LINES FOR SHORT CIRCUIT (SEE «CHECK CAN BUS LINES FOR SHORT CIRCUIT»(ref-225894-S16042398492006032300000) ) 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. RESISTANCE CONDITION (2 OF 4) Tester connection Condition Specified value D1-6(CANH)-D1-16 (BAT) IG switch OFF 1 Mohm or higher D1-14(CANL)-D1-16(BAT) IG Switch OFF 1 Mohm or higher NG: CHECK CAN BUS LINE FOR SHORT TO +B (SEE «CHECK CAN BUS LINE FOR SHORT TO +B»(ref-225894-S29635948672006032300000) ) 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. RESISTANCE CONDITION (3 OF 4) Tester connection Condition Specified value D1-4 (CG)-D1-6(CANH) IG switch OFF 3 kohm or higher D1-4(CG)-D1-14(CANL) IG switch OFF 3 kohm or higher NG: CHECK CAN BUS LINE FOR SHORT TO GND (SEE «CHECK CAN BUS LINE FOR SHORT TO GND»(ref-225894-S27217756072006032300000) ) OK: Go To Next Step
4. CHECK CAN BUS LINE (YAW RATE SENSOR SUB BUS LINE) Disconnect the connector (Y1) from the yaw rate sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (4 OF 4) Tester connection Condition Specified value Y1-2(CANL)-Y1-3(CANH) IG switch OFF 54 to 69 ohm NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: Go To Next Step HOW TO PROCEED WITH TROUBLESHOOTING (SEE «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-225894-S20320866002006032300000) )

Scheme 11

Scheme 12

Scheme 13

1. READ OUTPUT DTC Disconnect the connector (Y1) from the yaw rate sensor. Read the output diagnostic codes. DTC Result Reference Output DTC Result U0123/62 and U0124/95 are output simultaneously A U0073/94, U0123/62, U0124/95 and U0126/63 are output simultaneously B B: REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE «REPLACEMENT»(ref-225915-S37718129292006032300000) ) A: Go To Next Step REPLACE YAW RATE SENSOR (SEE «YAWRATE SENSOR»(ref-225915-S04458341342006032300000) )

Scheme 14

Scheme 15

Scheme 16

1. CHECK WIRE HARNESS (IG1, ESS) Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION Tester connection Condition Specified value S12-2 (ESS)-Body ground Always Below 1 ohm Measure the voltage according to the value(s) in the table below. VOLTAGE CONDITION Tester connection Condition Specified value S12-1 (IG1)-Body ground IG switch ON 10to14V NOTE: Perform the measurement from the back of the connector with the connector connected. NG: REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR OK: Go To Next Step REPLACE STEERING SENSOR (SEE «STEERING SENSOR»(ref-225915-S36019460742006032300000) )

Scheme 17

Scheme 18

Scheme 19

1. CHECK WIRE HARNESS (IG, GND) Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION Tester connection Condition Specified value Y1-1 (GND)-Body ground Always Below 1 ohm Measure the voltage according to the value(s) in the table below. VOLTAGE CONDITION Tester connection Condition Specified value Y1 -5 (IG)-Body ground IG switch ON 10to14V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step REPLACE YAW RATE SENSOR (SEE «YAWRATE SENSOR»(ref-225915-S04458341342006032300000) )

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 ft

Scheme 20

Scheme 21

Scheme 22

Scheme 23

Scheme 24

Scheme 25

1. CHECK DLC3 Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (1 OF 4) Tester connection Condition Specified value Result D1-6(CANH)-D1-14 (CANL) IG switch OFF 108 to 132 ohm A D1-6(CANH)-D1-14 (CANL) IG switch OFF 132 ohm or higher B NOTE: When the measured value is 132 ohm or more and the CAN communication system diagnostic code is output, there may be a fault besides 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 (SKID CONTROL ECU JUNCTION CONNECTOR) Disconnect the connector (J13) from the junction connector. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (2 OF 4) Tester connection Condition Specified value J13-4(CANH)-J13-15(CANL) IG switch OFF 108 to 132 ohm NG: Go to step 4 OK: Go To Next Step
3. CHECK STEERING SENSOR Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (3 OF 4) Tester connection Condition Specified value 10 (CANH) -9 (CANL) IG switch OFF 108 to 132 ohm NG: REPLACE STEERING SENSOR (SEE «STEERING SENSOR»(ref-225915-S36019460742006032300000) ) OK: GO TO NEXT STEP REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (STEERING SENSOR - JUNCTION CONNECTOR)
4. CHECK SKID CONTROL ECU Disconnect the connector (S1) from the skid control ECU. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (4 OF 4) Tester connection Condition Specified value 11 (CANH)-25 (CANL) IG switch OFF 108 to 132 ohm NG: REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE «REPLACEMENT»(ref-225915-S37718129292006032300000) ) OK: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (SKID CONTROL ECU - JUNCTION CONNECTOR)

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 ohm.

Scheme 26

Scheme 27

Scheme 28

Scheme 29

Scheme 30

Scheme 31

Scheme 32

Scheme 33

1. CHECK CAN BUS LINES FOR SHORT (DLC3 SUB BUS LINE) Disconnect the wire harness connector (J13) from the junction connector. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (1 OF 6) Tester connection Condition Specified value D1-6(CANH)-D1-14(CANL) IG switch OFF 1 Mohm or higher NG: REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP
2. CHECK CAN BUS LINES FOR SHORT (SKID CONTROL ECU - JUNCTION CONNECTOR) Disconnect the connector (S1) from the skid control ECU. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (2 OF 6) Tester connection Condition Specified value S1-11 (CANH) -S1 -25 (CANL) IG switch OFF 1 Mohm or higher HINT: Ensure that the wire harness connector is not connected to the junction connector. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (SKID CONTROL ECU - JUNCTION CONNECTOR) OK: GO TO NEXT STEP
3. CHECK SKID CONTROL ECU WITH ACTUATOR (CANH - CANL) Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (3 OF 6) Tester connection Condition Specified value 11 (CANH) -25 (CANL) IG switch OFF 108 to 132 ohm NG: REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE «REPLACEMENT»(ref-225915-S37718129292006032300000) ) OK: GO TO NEXT STEP
4. CHECK CAN BUS LINES FOR SHORT (STEERING SENSOR - JUNCTION CONNECTOR) Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (4 OF 6) Tester connection Condition Specified value S12-10 (CANH) -S12-9 (CANL) IG switch OFF 1 Mohm or higher HINT: Ensure that the wire harness connector is not connected to the junction connector. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (STEERING SENSOR - JUNCTION CONNECTOR) OK: GO TO NEXT STEP
5. CHECK STEERING SENSOR (CANH - CANL) Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (5 OF 6) Tester connection Condition Specified value 10 (CANH) -9 (CANL) IG switch OFF 108 to 132 ohm NG: REPLACE STEERING SENSOR (SEE «STEERING SENSOR»(ref-225915-S36019460742006032300000) ) OK: GO TO NEXT STEP
6. CHECK CAN BUS LINES FOR SHORT (YAW RATE SENSOR SUB BUS LINE) Disconnect the connector (Y1) from the yaw rate sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (6 OF 6) Tester connection Condition Specified value Y1-3(CANH)-Y1-2(CANL) IG switch OFF 1 Mohm or higher HINT: Ensure that the wire harness connector is not connected to the junction connector. NG: REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L) OK: GO TO NEXT STEP REPLACE YAW RATE SENSOR (SEE «YAWRATE SENSOR»(ref-225915-S04458341342006032300000) )

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

Scheme 34

Scheme 35

Scheme 36

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

1. CHECK CAN BUS LINE FOR SHORT TO +B (DLC3 SUB BUS LINE) Disconnect the wire harness connector (J13) from the junction connector. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (1 OF 6) Tester connection Condition Specified value D1-6(CANH)-D1-16(BAT) IG Switch OFF 1 Mohm or higher D1-14(CANL)-D 1-16 (BAT) IG Switch OFF 1 Mohm 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 wire harness connector (J13) to the junction connector. NEXT: GO TO NEXT STEP
3. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU) Disconnect the connector (S1) from the skid control ECU. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (2 OF 6) Tester connection Condition Specified value D1-6(CANH)-D1-16(BAT) IG Switch OFF 1 Mohm or higher D1-14(CANL)-D 1-16 (BAT) IG Switch OFF 1 Mohm or higher OK REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE «REPLACEMENT»(ref-225915-S37718129292006032300000) ) NG: GO TO NEXT STEP
4. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR) Reconnect the connector (S1) to the skid control ECU. Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (3 OF 6) Tester connection Condition Specified value D1-6(CANH)-D1-16(BAT) IG Switch OFF 1 Mohm or higher D1-14(CANL)-D1-16(BAT) IG Switch OFF 1 Mohm or higher OK: REPLACE STEERING SENSOR (SEE «STEERING SENSOR»(ref-225915-S36019460742006032300000) ) NG: GO TO NEXT STEP
5. CHECK CAN BUS LINE FOR SHORT TO +B (YAW RATE SENSOR) Reconnect the connector (S12) to the steering sensor. Disconnect the connector (Y1) from the yaw rate sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (4 OF 6) Tester connection Condition Specified value D1-6(CANH)-D1-16(BAT) IG Switch OFF 1 Mohm or higher D1-14(CANL)-D1-16(BAT) IG Switch OFF 1 Mohm or higher OK: REPLACE YAW RATE SENSOR (SEE «YAWRATE SENSOR»(ref-225915-S04458341342006032300000) ) NG: GO TO NEXT STEP
6. CHECK CAN BUS LINE FOR SHORT TO +B (SKID CONTROL ECU - JUNCTION CONNECTOR) Reconnect the connector (Y1) to the yaw rate sensor. Disconnect the wire harness connector (J13) from the junction connector. Disconnect the connector (S1) from the skid control ECU. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (5 OF 6) Tester connection Condition Specified value S1-11 (CANH)-S1-31 (+BS) IG switch OFF 1 Mohm or higher S 1-25 (CAN L)-S1-31 (+BS) IG switch OFF 1 Mohm or higher NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (SKID CONTROL ECU - JUNCTION CONNECTOR) OK: GO TO NEXT STEP
7. CHECK CAN BUS LINE FOR SHORT TO +B (STEERING SENSOR - JUNCTION CONNECTOR) Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (6 OF 6) Tester connection Condition Specified value S12-10 (CANH) -S12-3 (BAT) IG switch OFF 1 Mohm or higher S12-9 (CANL) -S12-3 (BAT) IG switch OFF 1 Mohm or higher HINT: Ensure that the wire harness connector is not connected to the junction connector. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (STEERING SENSOR - JUNCTION CONNECTOR) OK: GO TO NEXT STEP REPAIR OR REPLACE YAW RATE 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.

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

1. CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE) Disconnect the wire harness connector (J13) from the junction connector. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (1 OF 6) Tester connection Condition Specified value D1-4(CG)-D1-6 (CANH) IG switch OFF 1 Mohm or higher D1-4(CG)-D1-14(CANL) IG switch OFF 1 Mohm 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 wire harness connector (J13) to the junction connector. NEXT: GO TO NEXT STEP
3. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU) Disconnect the connector (S1) from the skid control ECU. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (2 OF 6) Tester connection Condition Specified value D1-4 (CG)-D1-6 (CANH) IG switch OFF 3 kohm or higher D1-4(CG)-D1-14(CANL) IG switch OFF 3 kohm or higher OK REPLACE SKID CONTROL ECU WITH ACTUATOR (SEE «REPLACEMENT»(ref-225915-S37718129292006032300000) ) NG: GO TO NEXT STEP
4. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR) Reconnect the connector (S1) to the skid control ECU. Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (3 OF 6) Tester connection Condition Specified value D1-4(CG)-D1-6(CANH) IG switch OFF 3 kohm or higher D1-4 (CG) -D1-14(CANL) IG switch OFF 3 kohm or higher OK: REPLACE STEERING SENSOR (SEE «STEERING SENSOR»(ref-225915-S36019460742006032300000) ) NG: GO TO NEXT STEP
5. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR) Reconnect the connector (S12) to the steering sensor. Disconnect the connector (Y1) from the yaw rate sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (4 OF 6) Tester connection Condition Specified value D1- 4 (CG) -D1-6 (CANH) IG switch OFF 3 kohm or higher D1-4 (CG)-D1-14(CANL) IG switch OFF 3 kohm or higher OK: REPLACE YAW RATE SENSOR (SEE «YAWRATE SENSOR»(ref-225915-S04458341342006032300000) ) NG: GO TO NEXT STEP
6. CHECK CAN BUS LINE FOR SHORT TO GND (SKID CONTROL ECU - JUNCTION CONNECTOR) Reconnect the connector (Y1) to the yaw rate sensor. Disconnect the wire harness connector (J13) from the junction connector. Disconnect the connector (S1) from the skid control ECU. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (5 OF 6) Tester connection Condition Specified value S1-11 (CANH)-S1-32(GND1) IG switch OFF 1 Mohm or higher S1-25(CANL)-S1-32(GND1) IG switch OFF 1 Mohm or higher NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (SKID CONTROL ECU - JUNCTION CONNECTOR) OK: GO TO NEXT STEP
7. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR - JUNCTION CONNECTOR) Disconnect the connector (S12) from the steering sensor. Measure the resistance according to the value(s) in the table below. RESISTANCE CONDITION (6 OF 6) Tester connection Condition Specified value S12-2(ESS)-S 12-10 (CAN H) IG switch OFF 1 Mohm or higher S12-2(ESS)-S12-9(CANL) IG switch OFF 1 Mohm or higher HINT: Ensure that the wire harness connector is not connected to the junction connector. NG: REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (STEERING SENSOR - JUNCTION CONNECTOR) OK: GO TO NEXT STEP REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)