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Diagnosis Item 16: Diagnose shorts between CAN_H and L lines (EV-CAN).
 
 
cautionWhen servicing a CAN bus line, ground yourself by touching a metal object such as an unpainted water pipe. If you fail to do, a component connected to the CAN bus line may be broken.
 
 
TROUBLE JUDGMENT
When all of the following conditions are met, the scan tool (M.U.T.-IIISE) determines that a short circuit is present between CAN_L and CAN_H lines.
  • The scan tool (M.U.T.-IIISE) cannot receive the periodic transmission data from any ECUs.
  • The voltage between CAN-C (CAN_L and CAN_H lines) is 1.0 V or more, 4.0 V or less.
  • The resistance at CAN-C (CAN_L and CAN_H lines) is 2 ohms or less.
 
 
TROUBLESHOOTING HINTS
  • Damaged harness wires and connectors
  • Malfunction of the PHEV-ECU
  • Malfunction of the power drive unit
  • Malfunction of the A/C compressor
  • Malfunction of the electrical parking driver unit
  • Malfunction of the REMCU
  • Malfunction of the on board charger/DC-DC converter
  • Malfunction of the electric heater (electric heater-ECU)
  • Malfunction of the BMU
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Connector check: C-146 intermediate connector.
cautionThe strand end of the twist wire should be within 10 cm (4 inches) from the connector. For details refer to .
Is the check result normal?
Go to Step 2.
Repair the defective connector.
 
STEP 2. Resistance measurement at C-146 intermediate connector.
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the connector, and measure at its female-side intermediate connector (at the front wiring harness side).
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between C-146 intermediate connector terminal Nos.17 and 18
OK: 120 ± 20 ohms
Is the check result normal?
<Within 120 ± 20 ohms> Go to Step 12.
<Not within 120 ± 20 ohms> Go to Step 3.
 
STEP 3. Connector check: joint connector (CAN6) and joint connector (CAN9).
cautionThe strand end of the twist wire should be within 10 cm (4 inches) from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.
Is the check result normal?
Go to Step 4.
Repair a defective connector or replace the joint connector.
 
STEP 4. Resistance measurement at joint connector (CAN6).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN6) terminal Nos.6 and 8
OK: 120 ± 20 ohms
Is the check result normal?
<Within 120 ± 20 ohms> Go to Step 6.
<Not within 120 ± 20 ohms> Go to Step 5.
 
STEP 5. Resistance measurement at BMU connector.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to GROUP 00 - Precautions on how to use the high-voltage vehicle .
dangerWear the specified protection equipment during the check.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the BMU, and measure at the equipment side.
(2) Resistance between BMU connector terminal Nos.6 and 7
OK: 120 ± 20 ohms
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<Within 120 ± 20 ohms> Repair the wiring harness between joint connector (CAN6) and the BMU connector.
<Not within 120 ± 20 ohms> Check the BMU connector, and repair if necessary. If the BMU connector is in good condition, replace the BMU.
 
STEP 6. Resistance measurement at joint connector (CAN9).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN9) terminal Nos.6 and 8
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 8.
<Less than 1 kΩ> Go to Step 7.
 
STEP 7. Resistance measurement at electric heater connector.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to GROUP 00 - Precautions on how to use the high-voltage vehicle .
dangerWear the specified protection equipment during the check.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the electric heater, and measure at the equipment side.
(2) Resistance between electric heater connector terminal Nos.3 and 4
OK: 1 kΩ or more
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint connector (CAN9) and the electric heater connector.
<Less than 1 kΩ> Check the electric heater connector, and repair if necessary. If the electric heater connector is in good condition, replace the electric heater (electric heater-ECU).
 
STEP 8. Resistance measurement at joint connector (CAN6).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN6) terminal Nos.5 and 7
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 10.
<Less than 1 kΩ> Go to Step 9.
 
STEP 9. Resistance measurement at REMCU connector.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to GROUP 00 - Precautions on how to use the high-voltage vehicle .
dangerWear the specified protection equipment during the check.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the REMCU, and measure at the equipment side.
(2) Resistance between REMCU connector terminal Nos.5 and 6
OK: 1 kΩ or more
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint connector (CAN6) and the REMCU connector.
<Less than 1 kΩ> Check the REMCU connector, and repair if necessary. If the REMCU connector is in good condition, replace the REMCU.
 
STEP 10. Resistance measurement at joint connector (CAN6).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the connector, and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN6) terminal Nos.1 and 3
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint connector (CAN6) and joint connector (CAN9) or joint connector (CAN9) and C-146 intermediate connector.
<Less than 1 kΩ> Go to Step 11.
 
STEP 11. Resistance measurement at on board charger/DC-DC converter connector.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to GROUP 00 - Precautions on how to use the high-voltage vehicle .
dangerWear the specified protection equipment during the check.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the on board charger/DC-DC converter, and measure at the equipment side.
(2) Resistance between on board charger/DC-DC converter connector terminal Nos.6 and 13
OK: 1 kΩ or more
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<1 kΩ or more> Repair intermediate connector D-206, or the wiring harness between joint connector (CAN6) and on board charger/DC-DC converter connector.
<Less than 1 kΩ> Check the on board charger/DC-DC converter connector, and repair if necessary. If the on board charger/DC-DC converter connector is in good condition, replace the on board charger/DC-DC converter.
 
STEP 12. Resistance measurement at joint connector (CAN1) and joint connector (CAN2).
cautionThe strand end of the twist wire should be within 10 cm (4 inches) from the connector. For details refer to .
When checking the joint connector, ensure that its wiring harness side and its short pins are not damaged.
Is the check result normal?
Go to Step 13.
Repair a defective connector or replace the joint connector.
 
STEP 13. Resistance measurement at joint connector (CAN2).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN2) terminal Nos.11 and 22
OK: 120 ± 20 ohms
Is the check result normal?
: <Within 120 ± 20 ohms> Go to Step 15.
: <Not within 120 ± 20 ohms> Go to Step 14.
 
STEP 14. Resistance measurement at PHEV-ECU connector.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the PHEV-ECU, and measure at the equipment side.
(2) Resistance between PHEV-ECU connector terminal Nos.53 and 52
OK: 120 ± 20 ohms
cautionThe test wiring harness should be used. For details refer to .
Is the check result normal?
<Within 120 ± 20 ohms> Repair the wiring harness between joint connector (CAN2) and the PHEV-ECU connector.
<Not within 120 ± 20 ohms> Check the PHEV-ECU connector, and repair if necessary. If the PHEV-ECU connector is in good condition, replace the PHEV-ECU.
 
STEP 15. Resistance measurement at joint connector (CAN1).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect joint connector (CAN1), and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN1) terminal Nos.7 and 16
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 17.
<Less than 1 kΩ> Go to Step 16.
 
STEP 16. Resistance measurement at electrical parking driver unit connector.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the electrical parking driver unit, and measure at the equipment side.
(2) Resistance at electrical parking driver unit connector terminal Nos.37 and 38
OK: 1 kΩ or more
cautionThe test wiring harness should be used. For details refer to .
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint connector (CAN1) and the electrical parking driver unit connector.
<Less than 1 kΩ> Check the electrical parking driver unit connector, and repair if necessary. If the electrical parking driver unit connector is in good condition, replace the electrical parking driver unit.
 
STEP 17. Resistance measurement at joint connector (CAN2).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect joint connector (CAN2), and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN2) terminal Nos.9 and 20
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 19.
<Less than 1 kΩ> Go to Step 18.
 
STEP 18. Resistance measurement at power drive unit connector.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to GROUP 00 - Precautions on how to use the high-voltage vehicle .
dangerWear the specified protection equipment during the check.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the power drive unit, and measure at the equipment side.
(2) Resistance between power drive unit connector terminal Nos.3 and 8
OK: 1 kΩ or more
(3)
cautionThe test wiring harness should be used. For details refer to .
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint connector (CAN2) and the power drive unit connector.
<Less than 1 kΩ> Check the power drive unit connector, and repair if necessary. If the power drive unit connector is in good condition, replace the power drive unit.
 
STEP 19. Resistance measurement at joint connector (CAN2).
cautionA digital multimeter should be used. For details refer to .
cautionThe test wiring harness should be used. For details refer to .
(1) Disconnect the joint connector (CAN2), and measure at the wiring harness side.
(2) Turn off the power supply mode of the electric motor switch.
(3)
cautionWhen measuring the resistance, disconnect the negative 12V starter battery terminal. For details refer to .
Ensure that the negative 12V starter battery terminal is disconnected.
(4) Resistance between joint connector (CAN2) terminal Nos.8 and 19
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between joint connector (CAN2) and joint connector (CAN1) or joint connector (CAN1) and intermediate connector C-146.
<Less than 1 kΩ> Go to Step 20.
 
STEP 20. Resistance measurement at A/C compressor connector.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle. Refer to GROUP 00 - Precautions on how to use the high-voltage vehicle .
dangerWear the specified protection equipment during the check.
cautionA digital multimeter should be used. For details refer to .
(1) Remove the A/C compressor, and measure at the equipment side.
(2) Resistance at A/C compressor connector terminal Nos.3 and 4
OK: 1 kΩ or more
cautionThe test wiring harness should be used. For details refer to .
Is the check result normal?
<1 kΩ or more> Check the intermediate connector A-107, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) and the A/C compressor connector.
<Less than 1 kΩ> Check the A/C compressor connector, and repair if necessary. If the A/C compressor connector is in good condition, replace the A/C compressor.