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DTC B111C Electric heater input VOLT. low
 
 
 
 
DTC SET CONDITION
This code is set when the low voltage abnormality (high voltage less than DC 195 volts is detected for 2 seconds) judged by the electric heater (electric heater-ECU) is detected.
 
 
PROBABLE CAUSES
  • Malfunction of high-voltage connector and wiring harness
  • Malfunction of high-voltage fuse No. 3
  • Poor connection of high-voltage fuse No. 3
  • Malfunction of electric heater (electric heater-ECU)
  • Malfunction of the power drive unit
  • Malfunction of the generator control unit
 
 
DIAGNOSIS
Required Special Tools:
  • MB991223: Harness Set
  • MB992006: Extra Fine Probe
STEP 1. Check the high-voltage connector and wiring harness.
dangerCarry out the check on the high-voltage circuit while reading carefully the precautions on handling a high-voltage vehicle (Refer to GROUP 54Da - Precautions on how to use the high-voltage vehicle ).
dangerWear the specified protection equipment during the check.
1. Shut down the high voltage (Refer to GROUP 00 - Precautions before Service - Precautions on handling high-voltage vehicle ).
2. Check the electric heater (electric heater-ECU) connector.
3. Check the high-voltage fuse No. 3 connecting bolt for looseness.
4. Visually check and check the continuity of the high-voltage fuse No. 3.
5. Visually check the following high-voltage wiring harnesses for damage.
  • High-voltage wiring harness on power drive unit side
  • High-voltage wiring harness on electric heater (electric heater-ECU) side
Is the check result normal?
Go to Step 4.
: Replace the high-voltage fuse No. 3.
: Repair the connector(s) or the wiring harness wire(s) at the electric heater (electric heater-ECU) side. Then go to Step 4.
: Repair the connector(s) or the wiring harness wire(s) at the power drive unit side. Then go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the power drive unit (FEMCU) DTC is set.
Check whether the power drive unit (FEMCU) related DTC is set.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the electric motor switch to the OFF position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ".
(2) Turn the electric motor switch from OFF position to ON position.
(3) Check the DTC is set.
(4) Turn the electric motor switch to the OFF position.
Is the DTC set?
Diagnose the power drive unit [Refer to GROUP 54Db - DTC chart for electric motor control unit ]. Then go to Step 3.
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the generator control unit (GCU) DTC is set.
Check whether the generator control unit (GCU) related DTC is set.
Is the DTC set?
Diagnose the generator control unit [Refer to GROUP 54Db - DTC chart for electric motor control unit (Generator control unit) ]. Then go to Step 4.
Go to Step 4.
 
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Is the DTC set?
Go to Step 5.
Intermittent malfunction. Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, - How to Cope with Intermittent Malfunctions .)
 
STEP 5. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Is the DTC set?
Replace the electric heater (electric heater-ECU) (Refer to ).
This diagnosis is complete.