Code No.C2100: Battery voltage abnormal (low voltage)
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- If there is any problem in the CAN bus lines, an incorrect diagnosis code may be stored. Prior to this diagnosis, diagnose the CAN bus lines.
- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
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OPERATION
4WD-ECU detects a power supply voltage abnormal drop, and if any abnormality occurs, it interrupts the system.
DIAGNOSIS CODE SET CONDITIONS
If the following conditions are met when the system is activated, the 4WD-ECU gradually switches the control from 4WD to 2WD and stores diagnosis code No. C2100.
- IG1 voltage: Less than 9V
- Voltage between the battery and the 4WD-ECU: Less than 9 V
PROBABLE CAUSES
- Battery failure
- Malfunction of charging system
- Malfunction of ETACS-ECU (power supply circuit system)
- Damaged harness wires and connectors
- Malfunction of electronic control coupling solenoid
- Malfunction of 4WD-ECU
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STEP 1. M.U.T.-III other system diagnosis code.
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Check the ETACS diagnosis code (Refer to GROUP 54A - Troubleshooting  ).
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Q.
Is the diagnosis code stored?
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 Perform the relevant troubleshooting.
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 Go to Step 2
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STEP 2. Check the battery.
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Refer to GROUP 54A - Battery Test .
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Q.
Is the check result normal?
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Go to Step 4
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Charge or replace the battery. Then go to Step 3.
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STEP 3. Check the charging system.
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Refer to GROUP 16 - Charging System .
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Q.
Is the check result normal?
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Go to Step 4
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Repair or replace the charging system component(s).
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STEP 4. Voltage measurement at 4WD-ECU connector
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(1)Disconnect the 4WD-ECU connector.
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(2)Measure the voltage between the wiring harness side connector terminal (4WDF) and body earth.
OK: System voltage
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Q.
Is the check result normal?
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Go to Step 6
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Repair the defective connector or the wiring harness. Then go to Step 5.
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STEP 5. M.U.T.-III data list.
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Check the following data list (Refer to ).
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- Item No.31: Battery voltage (CAN input)
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ). Then go to Step 10.
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STEP 6. Check the wiring harness between 4WD-ECU connector terminal GND1 and body earth.
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(1)Disconnect the 4WD-ECU connector.
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(2)Measure the resistance between the wiring harness side connector terminal (GND1) and body earth.
OK: Continuity exists (2 Ω or less).
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Q.
Is the check result normal?
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Go to Step 7
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Repair the defective connector or the wiring harness. Then go to Step 10.
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STEP 7. Check the wiring harness between electronic control coupling solenoid connector and 4WD-ECU connector.
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(1)Disconnect the 4WD-ECU connector and the electronic-controlled coupling solenoid connector.
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(2)Measure the resistance between the wiring harness side connector terminals (SOL+ and SOL-) of the 4WD-ECU connector and body earth
OK: No continuity
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Q.
Is the check result normal?
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Go to Step 8
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Repair the defective connector or the wiring harness. Then go to Step 10.
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STEP 8. Check of the electronic control coupling solenoid
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Refer to .
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Q.
Is the check result normal?
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Go to Step 9
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Replace the electronic control coupling (Refer to ). Then go to Step 10.
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STEP 9. M.U.T.-III data list.
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Check the following data list (Refer to ).
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- Item No.31: Battery voltage (CAN input)
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Q.
Is the check result normal?
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
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Replace the 4WD-ECU (Refer to ). Then go to Step 10.
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STEP 10. Check whether the diagnosis code is stored again.
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Q.
Is diagnosis code No.C2100 stored?
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Return to Step 1.
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This diagnosis is complete.
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