Diagnosis Item 2: Diagnose shorts in the earth to CAN bus line

FUNCTION

TROUBLE JUDGEMENT CONDITIONS

TROUBLESHOOTING HINTS

• Malfunction of the wiring harness
  
• Malfunction 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 resistance at harness side of diagnosis connector C-22. (2) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-22 diagnosis connector terminal No.6 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-22 diagnosis connector terminal No.14 (CAN_L) and body earth OK: 1 kΩ or more Q. Is the check result normal? <Both of the measurement results show 1 kΩ or more> Go to Step 28. <Either of CAN_H line or CAN_L line the measurement results show 1 kΩ or more> 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 (C-53 <LHD> or C-35 <RHD>), and measure at its male-side intermediate connector (at the front wiring harness side). (2) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-53 <LHD> or C-35 <RHD> intermediate connector terminal No.6 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-53 <LHD> or C-35 <RHD> intermediate connector terminal No.7 (CAN_L) and body earth OK: 1 kΩ or more Q. Is the check result normal? <1 kΩ or more> Go to Step 7. <less than 1 kΩ > 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-01 joint connector (CAN2) terminal No.9 (CAN_H) and body earth <LHD> OK: 1 kΩ or more

(4)Resistance between C-01 joint connector (CAN2) terminal No.20 (CAN_L) and body earth <LHD> OK: 1 kΩ or more

(5)Resistance between C-01 joint connector (CAN2) terminal No.10 (CAN_H) and body earth <RHD> OK: 1 kΩ or more

(6)Resistance between C-01 joint connector (CAN2) terminal No.21 (CAN_L) and body earth <RHD> OK: 1 kΩ or more Q. Is the check result normal? YES <M/T> : <1 kΩ or more> 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> : <1 kΩ or more> Go to Step 4. NO : <less than 1 kΩ > 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-01 joint connector (CAN2) terminal No.10 (CAN_H) and body earth <LHD> OK: 1 kΩ or more

(4)Resistance between C-01 joint connector (CAN2) terminal No.21 (CAN_L) and body earth <LHD> OK: 1 kΩ or more

(5)Resistance between C-01 joint connector (CAN2) terminal No.9 (CAN_H) and body earth <RHD> OK: 1 kΩ or more

(6)Resistance between C-01 joint connector (CAN2) terminal No.20 (CAN_L) and body earth <LHD> OK: 1 kΩ or more Q. Is the check result normal? <1 kΩ or more> 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>). <less than 1 kΩ > 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. note The ECUs that are not adopted are not displayed. 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.9 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.20 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <1 kΩ or more> Go to Step 8. <less than 1 kΩ > 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.8 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.19 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? YES <vehicles without RV meter, multi display station, ABS, ASTC and A/C> : <1 kΩ or more> Go to Step 27. YES <vehicles with RV meter> : <1 kΩ or more> Go to Step 11. YES <vehicles with multi display station> : <1 kΩ or more> Go to Step 13. YES <vehicles without RV meter and multi display station, and with ABS> : <1 kΩ or more> Go to Step 15. YES <vehicles without RV meter and multi display station, and with ASTC> : <1 kΩ or more> Go to Step 18. YES <vehicles without RV meter, multi display station, ABS and ASTC, and with A/C> : <1 kΩ or more> Go to Step 25. NO : <less than 1 kΩ > Go to Step 9.

(1)Disconnect immobilizer-ECU connector C-142, 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. note The ECUs that are not adopted are not displayed. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the immobilizer-ECU connector. Check the immobilizer-ECU connector, and repair if necessary. If the immobilizer-ECU connector is in good condition, go to Step 10.

	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 immobilizer-ECU connector, and repair if necessary. If the immobilizer-ECU connector is in good condition, replace the immobilizer-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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.7 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.18 (CAN_L) and body earth OK: 1 kΩ or more (5) 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> : <1 kΩ or more> Go to Step 27. YES <vehicles with ABS> : <1 kΩ or more> Go to Step 15. YES <vehicles with ABS> : <1 kΩ or more> Go to Step 18. YES <vehicles without ABS and ASTC, and with A/C> : <1 kΩ or more> Go to Step 25. NO : <less than 1 kΩ > Go to Step 12.

(1)Disconnect CAN adapter connector C-110, 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. note The ECUs that are not adopted are not displayed. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the CAN adapter connector. Check the CAN adapter connector, and repair if necessary. If the CAN adapter connector is in good condition, 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.7 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.18 (CAN_L) and body earth OK: 1 kΩ or more (5) 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> : <1 kΩ or more> Go to Step 27. YES <vehicles with ABS> : <1 kΩ or more> Go to Step 15. YES <vehicles with ABS> : <1 kΩ or more> Go to Step 18. YES <vehicles without ABS and ASTC, and with A/C> : <1 kΩ or more> Go to Step 25. NO : <less than 1 kΩ > Go to Step 14.

(1)Disconnect multi display station connector C-109, 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. note The ECUs that are not adopted are not displayed. Q. Does M.U.T.-III screen correspond to the illustration? Repair the wiring harness between joint connector (CAN1) and the multi display station connector. Check the multi display station connector, and repair if necessary. If the multi display station connector is in good condition, refer to GROUP 54A - Multi display station .

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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.5 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.16 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? YES <vehicles without A/C> : <1 kΩ or more> Go to Step 27. YES <vehicles with A/C> : <1 kΩ or more> Go to Step 25. NO : <less than 1 kΩ > Go to Step 16.

(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. note The ECUs that are not adopted are not displayed. Q. Does M.U.T.-III screen correspond to the illustration? Check 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 17.

	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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.5 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.16 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <1 kΩ or more> Go to Step 21. <less than 1 kΩ > Go to Step 19.

(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. note The ECUs that are not adopted are not displayed. Q. Does M.U.T.-III screen correspond to the illustration? Check 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 20.

	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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.3 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.14 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <1 kΩ or more> Go to Step 23. <less than 1 kΩ > Go to Step 22.

(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. note The ECUs that are not adopted are not displayed. 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.4 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.15 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? YES <vehicles without A/C> : <1 kΩ or more> Go to Step 27. YES <vehicles with A/C> : <1 kΩ or more> Go to Step 25. NO : <less than 1 kΩ > Go to Step 24.

(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. note The ECUs that are not adopted are not displayed. 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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.6 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.17 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <1 kΩ or more> Go to Step 27. NO : <less than 1 kΩ > Go to Step 26.

(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. note The ECUs that are not adopted are not displayed. 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, refer to GROUP 55 .

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) caution When measuring the resistance, disconnect the negative battery terminal. For details refer to . Ensure that the negative battery terminal is disconnected.

(3)Resistance between C-119 joint connector (CAN1) terminal No.10 (CAN_H) and body earth OK: 1 kΩ or more

(4)Resistance between C-119 joint connector (CAN1) terminal No.21 (CAN_L) and body earth OK: 1 kΩ or more (5) caution Strictly observe the specified wiring harness repair procedure. For details refer to . Q. Is the check result normal? <1 kΩ or more> Repair the intermediate connector (C-53 <LHD> or C-35 <RHD>), or the wiring harness between joint connector (CAN1) and the intermediate connector (C-53 <LHD> or C-35 <RHD>). <less than 1 kΩ > 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. note The ECUs that are not adopted are not displayed. Q. Does M.U.T.-III screen correspond to the illustration? Go to Step 30. Check the engine-ECU connector, and repair if necessary. If the engine-ECU connector is in good condition, go to Step 29.

	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. note The ECUs that are not adopted are not displayed. 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 31.

	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.