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Diagnosis Item 15: Diagnose shorts in the ground to 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 CONDITIONS
The scan tool (M.U.T.-IIISE) judges the trouble when it is impossible to receive the periodically sent data and the voltage of CAN_H or CAN_L line is less than 1.0 V.
 
 
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. Check the EV-CAN. 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 intermediate connector, and measure at its female-side intermediate connector (at the front wiring harness side).
(2)
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.
(3) Resistance between C-146 intermediate connector terminal No.17 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between C-146 intermediate connector terminal No.18 (CAN_L) and body ground
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 14.
<Less than 1 kΩ > Go to Step 2.
 
STEP 2. Check the EV-CAN between joint connector (CAN6) and the BMU. 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 joint connector (CAN6), and measure at the wiring harness side.
(2)
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.
(3) Resistance between joint connector (CAN6) terminal No.8 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN6) terminal No.6 (CAN_L) and body ground
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> Go to Step 3.
<Less than 1 kΩ > Go to Step 12.
 
STEP 3. Check the EV-CAN between joint connector (CAN9) and the electric heater. 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 joint connector (CAN9), and measure at the wiring harness side.
(2)
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.
(3) Resistance between joint connector (CAN9) terminal No.8 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN9) terminal No.6 (CAN_L) and body ground
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 6.
<Less than 1 kΩ > Go to Step 4.
 
STEP 4. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [electric heater connector disconnected].
(1) Disconnect electric heater connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Repair the wiring harness between joint connector (CAN9) and the electric heater connector.
Check the electric heater connector, and repair if necessary. If the electric heater connector is in good condition, go to Step 5.
 
STEP 5. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
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.
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 electric heater connector, and repair if necessary. If the electric heater connector is in good condition, replace the electric heater (electric heater-ECU).
 
STEP 6. Check the EV-CAN between joint connector (CAN6) and the REMCU. 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 joint connector (CAN6), and measure at the wiring harness side.
(2)
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.
(3) Resistance between joint connector (CAN6) terminal No.7 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN6) terminal No.5 (CAN_L) and body ground
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 9.
<Less than 1 kΩ > Go to Step 7.
 
STEP 7. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [REMCU connector disconnected].
(1) Disconnect REMCU connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Repair the wiring harness between joint connector (CAN6) and the REMCU connector.
Check the REMCU connector, and repair if necessary. If the REMCU connector is in good condition, go to Step 8.
 
STEP 8. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
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.
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 REMCU connector, and repair if necessary. If the REMCU connector is in good condition, replace the REMCU.
 
STEP 9. Check the EV-CAN between joint connector (CAN6) and the on board charger/DC-DC converter. 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 joint connector (CAN6), and measure at the wiring harness side.
(2)
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.
(3) Resistance between joint connector (CAN6) terminal No.3 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN6) terminal No.1 (CAN_L) and body ground
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 10.
 
STEP 10. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [on board charger/DC-DC converter connector disconnected].
(1) Disconnect on board charger/DC-DC converter connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Check the intermediate connector, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN6) and the on board charger/DC-DC converter connector.
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, go to Step 11.
 
STEP 11. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
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.
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 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. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [BMU connector disconnected].
(1) Disconnect BMU connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Repair the wiring harness between joint connector (CAN6) and the BMU connector.
Check the BMU connector, and repair if necessary. If the BMU connector is in good condition, go to Step 13.
 
STEP 13. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
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.
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 BMU connector, and repair if necessary. If the BMU connector is in good condition, replace the BMU.
 
STEP 14. Check the EV-CAN between joint connector (CAN1) and the electrical parking driver unit. 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)
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.
(3) Resistance between joint connector (CAN1) terminal No.7 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN1) terminal No.16 (CAN_L) and body ground
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 15.
 
STEP 15. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [electrical parking driver unit connector disconnected].
(1) Disconnect electrical parking driver unit connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Repair the wiring harness between joint connector (CAN1) and the electrical parking driver unit connector.
Check the electrical parking driver unit connector, and repair if necessary. If the electrical parking driver unit connector is in good condition, go to Step 16.
 
STEP 16. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 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. Check the CAN line between joint connector (CAN2) and the PHEV-ECU. 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)
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.
(3) Resistance between joint connector (CAN2) terminal No.11 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN2) terminal No.22 (CAN_L) and body ground
OK: 1 kΩ or more
(5)
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Is the check result normal?
<1 kΩ or more> Go to Step 18.
: <Less than 1 kΩ > Go to Step 24.
 
STEP 18. Check the EV-CAN between joint connector (CAN2) and the power drive unit. 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)
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.
(3) Resistance between joint connector (CAN2) terminal No.9 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN2) terminal No.20 (CAN_L) and body ground
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Go to Step 21.
<Less than 1 kΩ > Go to Step 19.
 
STEP 19. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [power drive unit connector disconnected].
(1) Disconnect power drive unit connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Repair the wiring harness between joint connector (CAN2) and the power drive unit connector.
Check the power drive unit connector, and repair if necessary. If the power drive unit connector is in good condition, go to Step 20.
 
STEP 20. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
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.
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 power drive unit connector, and repair if necessary. If the power drive unit connector is in good condition, replace the power drive unit.
 
STEP 21. Check the EV-CAN between joint connector (CAN2) and the A/C compressor. 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)
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.
(3) Resistance between joint connector (CAN2) terminal No.8 (CAN_H) and body ground
OK: 1 kΩ or more
(4) Resistance between joint connector (CAN2) terminal No.19 (CAN_L) and body ground
OK: 1 kΩ or more
Is the check result normal?
<1 kΩ or more> Repair the wiring harness between C-146 intermediate connector and joint connector (CAN1) or joint connector (CAN1) and joint connector (CAN2).
<Less than 1 kΩ > Go to Step 22.
 
STEP 22. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [A/C compressor connector disconnected].
(1) Disconnect A/C compressor connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
cautionStrictly observe the specified wiring harness repair procedure. For details refer to .
Does scan tool (M.U.T.-IIISE) screen correspond to the illustration?
Check the intermediate connector, 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.
Check the A/C compressor connector, and repair if necessary. If the A/C compressor connector is in good condition, go to Step 23.
 
STEP 23. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
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.
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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/C compressor connector, and repair if necessary. If the A/C compressor connector is in good condition, replace the A/C compressor.
 
STEP 24. Scan tool (M.U.T.-IIISE) CAN bus diagnostics [PHEV-ECU connector disconnected].
(1) Disconnect PHEV-ECU connector, and diagnose by using the scan tool (M.U.T.-IIISE).
(2) Diagnose CAN bus lines, and check if scan tool (M.U.T.-IIISE) screen is as shown in the illustration.
Does scan tool (M.U.T.-IIISE) 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 PHEV-ECU connector, and repair if necessary. If the PHEV-ECU connector is in good condition, go to Step 25.
 
STEP 25. Scan tool (M.U.T.-IIISE) CAN bus diagnostics (retest the system).
Diagnose EV-CAN, and check if scan tool (M.U.T.-IIISE) screen shows normal state.
Is the check result normal?
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 PHEV-ECU connector, and repair if necessary. If the PHEV-ECU connector is in good condition, replace the PHEV-ECU.