Diagnosis Item 1: Diagnose shorts in the power supply to CAN bus line

FUNCTION

TROUBLE JUDGEMENT CONDITIONS

TROUBLESHOOTING HINTS

• Malfunction of the wiring harness
  
• Short to power supply of the connector
  
• Malfunction of each ECU
  

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect engine-ECU connector C-103 and ETACS-ECU connector C-219, and measure the voltage at the harness side of diagnosis connector C-22. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-22 diagnosis connector terminal No.6 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-22 diagnosis connector terminal No.14 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. Q. Is the check result normal? <Both of the measurement results show 4.0 V or less> Go to Step 23 . <Either of CAN_H line or CAN_L line the measurement results show more than 4.0 V> Go to Step 2.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect the intermediate connector, and measure at its male-side intermediate connector (at the control wiring harness side). (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-53 <LHD> or C-35 <RHD> intermediate connector terminal No.6 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-53 <LHD> or C-35 <RHD> intermediate connector terminal No.7 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. Q. Is the check result normal? <4.0 V or less> Go to Step 7. <More than 4.0 V> Go to Step 3.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN2), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-01 joint connector (CAN2) terminal No.9 (CAN_H) and body earth <LHD> OK: 4.0 V or less

(4)Voltage between C-01 joint connector (CAN2) terminal No.10 (CAN_H) and body earth <RHD> OK: 4.0 V or less

(5)Voltage between C-01 joint connector (CAN2) terminal No.20 (CAN_L) and body earth <LHD> OK: 4.0 V or less

(6)Voltage between C-01 joint connector (CAN2) terminal No.21 (CAN_L) and body earth <RHD> OK: 4.0 V or less (7)Disconnect the negative battery terminal. Q. Is the check result normal? YES <M/T> : <4.0 V or less> Repair intermediate connector C-53 <LHD> or C-35 <RHD>, or the wiring harness between joint connector (CAN2) and intermediate connector C-53 <LHD> or C-35 <RHD>. YES <A/T> : <4.0 V or less> Go to Step 4. NO : <More than 4.0 V> Repair the wiring harness between joint connector (CAN2) and the engine-ECU connector.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN2), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-01 joint connector (CAN2) terminal No.10 (CAN_H) and body earth <LHD> OK: 4.0 V or less

(4)Voltage between C-01 joint connector (CAN2) terminal No.9 (CAN_H) and body earth <RHD> OK: 4.0 V or less

(5)Voltage between C-01 joint connector (CAN2) terminal No.21 (CAN_L) and body earth <LHD> OK: 4.0 V or less

(6)Voltage between C-01 joint connector (CAN2) terminal No.20 (CAN_L) and body earth <RHD> OK: 4.0 V or less (7)Disconnect the negative battery terminal. Q. Is the check result normal? <4.0 V or less> Repair intermediate connector C-53 <LHD> or C-35 <RHD>, or the wiring harness between joint connector (CAN2) and the intermediate connector C-53 <LHD> or C-35 <RHD>. <More than 4.0 V> Go to Step 5.

(1)Disconnect A/T-ECU connector C-20, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN2) and the A/T-ECU connector. Check the A/T-ECU connector, and repair if necessary. If the A/T-ECU connector is in good condition, go to Step 6.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Check the A/T-ECU connector, and repair if necessary. If the A/T-ECU connector is in good condition, replace the A/T-ECU.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.9 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.20 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <4.0 V or less> Go to Step 8. <More than 4.0 V> Repair the wiring harness between joint connector (CAN1) and the ETACS-ECU connector.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.7 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.18 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? YES <vehicles without ABS, ASTC and A/C> : <4.0 V or less> Go to Step 22. YES <vehicles with ABS> : <4.0 V or less> Go to Step 10. YES <vehicles with ASTC> : <4.0 V or less> Go to Step 13. YES <vehicles without ABS and ASTC, and with A/C> : <4.0 V or less> Go to Step 20. NO : <More than 4.0 V> Go to Step 9.

(1)Disconnect RV meter connector C-171, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the RV meter connector. Check the RV meter connector, and repair if necessary. If the RV meter connector is in good condition, repair the RV meter power supply circuit. (Refer to GROUP 54A - RV meter .)

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.5 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.16 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? YES <vehicles without A/C> : <4.0 V or less> Go to Step 22. YES <vehicles with A/C> : <4.0 V or less> Go to Step 20. NO : <More than 4.0 V> Go to Step 11.

(1)Disconnect ABS-ECU connector A-01, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Check the intermediate connector (C-13), and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN1) and the ABS-ECU connector. Check the ABS-ECU connector, and repair if necessary. If the ABS-ECU connector is in good condition, go to Step 12.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Check the ABS-ECU connector, and repair if necessary. If the ABS-ECU connector is in good condition, replace the hydraulic unit assembly.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.5 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.16 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <4.0 V or less> Go to Step 16. <More than 4.0 V> Go to Step 14.

(1)Disconnect ASTC-ECU connector A-48, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Check the intermediate connector (C-13), and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN1) and the ASTC-ECU connector. Check the ASTC-ECU connector, and repair if necessary. If the ASTC-ECU connector is in good condition, go to Step 15.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Check the ASTC-ECU connector, and repair if necessary. If the ASTC-ECU connector is in good condition, replace the hydraulic unit assembly.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.3 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.14 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <4.0 V or less> Go to Step 18. NO : <More than 4.0 V> Go to Step 17.

(1)Disconnect steering wheel sensor connector C-308, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the steering wheel sensor connector. Check the steering wheel sensor connector, and repair if necessary. If the steering wheel sensor connector is in good condition, repair the steering wheel sensor power supply circuit.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.4 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.15 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? YES <vehicles without A/C> : <4.0 V or less> Go to Step 22. YES <vehicles with A/C> : <4.0 V or less> Go to Step 20. NO : <More than 4.0 V> Go to Step 19.

(1)Disconnect G and yaw rate sensor connector C-144, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the G and yaw rate sensor connector. Check the G and yaw rate sensor connector, and repair if necessary. If the G and yaw rate sensor connector is in good condition, repair the G and yaw rate sensor power supply circuit.

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.6 (CAN_H) and body earth OK: 4.0 V or less

(4)Voltage between C-119 joint connector (CAN1) terminal No.17 (CAN_L) and body earth OK: 4.0 V or less (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <4.0 V or less> Go to Step 22. <More than 4.0 V> Go to Step 21.

(1)Disconnect A/C-ECU connector C-43, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the A/C-ECU connector. Check the A/C-ECU connector, and repair if necessary. If the A/C-ECU connector is in good condition, repair the A/C-ECU power supply circuit. (Refer to GROUP 55B .)

caution A digital multimeter should be used. For details refer to .

caution The test wiring harness should be used. For details refer to .

(1)Disconnect joint connector (CAN1), and measure at the wiring harness side. (2)Connect the negative battery terminal, and turn the ignition switch to the ON position.

(3)Voltage between C-119 joint connector (CAN1) terminal No.10 (CAN_H) and body earth OK: Less than 1.0 V

(4)Voltage between C-119 joint connector (CAN1) terminal No.21 (CAN_L) and body earth OK: Less than 1.0 V (5)Disconnect the negative battery terminal. caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <Less than 1.0 V> Repair the intermediate connector, or the wiring harness between joint connector (CAN1) and the intermediate connector C-53 <LHD> or C-35 <RHD>. <1.0 V or more> Repair the diagnosis connector, or the wiring harness between joint connector (CAN1) and the diagnosis connector.

(1)Disconnect engine-ECU connector C-103 and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? Go to Step 25. Check the engine-ECU connector, and repair if necessary. If the engine-ECU connector is in good condition, go to Step 24.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Check the engine-ECU connector, and repair if necessary. If the engine-ECU connector is in good condition, replace the engine-ECU.

(1)Disconnect ETACS-ECU connector C-219, and diagnose by using the M.U.T.-III.

(2)Diagnose CAN bus lines, and check if M.U.T.-III screen is as shown in the illustration. Q. Does M.U.T.-III screen correspond to the illustration? The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ). Check the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition, go to Step 26.

	The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).

	Check the ETACS-ECU connector, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.