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Q.
Is diagnosis code No. B1353 set?
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Perform the troubleshooting of diagnosis code No. B1353: DC/DC converter (control system) control circuit .
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- Ask the user whether he or she connects the vehicle with accessories having the rated output current large enough to possibly cause overloads (overcurrents) or not. Or ask the user whether he or she modifies the circuit or not.
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Q.
Does the user connect the vehicle with accessories having the large rated output current? Or does the user modify the circuit?
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Turn OFF the accessories or remove them. Then go to Step 3.
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- Turn the ignition switch to "ON" position.
- Turn the ignition switch to "LOCK" (OFF) position.
- Repeat Steps 1-2.
- Turn the ignition switch to "ON" position and check the data list after having passed for more than 60 seconds.
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- Item 27: DC-DC OUT for powertrain (Input)
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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Q.
Is the diagnosis code U0101 set?
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Perform the troubleshooting of diagnosis code No. U0101: CVT CAN timeout .
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Q.
Is the diagnosis code U0101 set?
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Perform the troubleshooting of diagnosis code No. U0121: ASC-ECU CAN timeout .
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Check the DC/DC converter (control system) power supply circuit (Refer to GROUP 23A - Troubleshooting - Inspection procedure 8: DC/DC converter power supply system check ).
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Q.
Is the check result normal?
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Revise a circuit according to troubleshooting. Then go to Step 7.
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- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal DCCP and earth.
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Q.
Is the check result normal?
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- Check output line for open/short circuit.
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Q.
Is the check result normal?
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Replace the DC/DC converter (control system).
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Repair the connector(s) or wiring harness.
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- Measure the voltage AS&G-ECU connector terminal.
- Ignition switch: ON
- Voltage between terminal DCCP and earth.
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Q.
Is the check result normal?
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- Reconfirmation of the diagnosis code.
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Q.
Is the diagnosis code set?
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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- Disconnect connector, and measure at harness side.
- Ignition switch: ON
- Voltage between terminal DCDP and earth.
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Q.
Is the check result normal?
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Repair the connector(s), or check and repair of short to earth in DCDP line between DC/DC converter (control system) connector and AS&G-ECU connector.
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Q.
Is the check result normal?
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Repair the connector(s) or wiring harness.
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- Measure the voltage DC/DC converter (control system) connector terminal.
- Measure the voltage between terminal OUT1 and earth at auto start.
- Measure the voltage between terminal OUT2 and earth at auto start.
- Check the difference among the measured voltage of the terminal OUT1 and the measured voltage of the terminal OUT2.
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Q.
Is the check result normal?
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Replace the DC/DC converter (control system).
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- Turn the ignition switch to "ON" position.
- Turn the ignition switch to "LOCK" (OFF) position.
- Repeat Steps 1-2.
- Confirm again whether the diagnosis code is set.
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Q.
Is the diagnosis code set?
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Replace the DC/DC converter (control system). Then go to Step 15.
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Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).
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- Reconfirmation of the diagnosis code.
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Q.
Is the diagnosis code set?
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