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DTC C2101: Abnormal battery voltage (Too high)
 
 

cautionIf there is any problem in the CAN bus lines, an incorrect DTC may be stored. Prior to this diagnosis, always diagnose the CAN bus lines.
 
 
OPERATION
AWD-ECU detects a power supply voltage abnormal increase, and if any abnormality occurs, it interrupts the system.
 
 
DTC SET CONDITIONS
If the following conditions are met when the system is activated, AWD-ECU gradually switches the control from AWD to FWD, flashes the AWD/LOCK indicators alternately, and stores DTC C2101.
  • IG1 voltage: More than 17 V
  • Voltage between the battery and ETACS-ECU: More than 17 V
 
 
TROUBLESHOOTING HINTS
Current trouble
  • Damaged wiring harness and connectors
    • High-voltage short-circuit between the battery and AWD-ECU
    • Malfunction of generator or other power supply systems
Past trouble
  • Intermittent wiring harness or connector failure
    noteFor diagnosis procedures, refer to "How to treat past trouble" (Refer to GROUP 00 - How to Use Troubleshooting/How to Treat Past Trouble ).
  • Malfunction of generator or other power supply systems
 
 
DIAGNOSIS
STEP 1. Battery voltage check
Check the battery voltage.
Is the check result normal?
Go to Step 2.
Charge or replace the battery.
 
STEP 2. Generator output current check
Check if the generator is correctly operated (Refer to GROUP 16 - On-vehicle Service/Output Current Test ).
Is the check result normal?
Go to Step 3.
Replace the generator.
 
STEP 3. Voltage measurement at the ETACS-ECU connector
(1) Disconnect the C-408 ETACS-ECU connector.
(2) Measure the voltage between the C-408 harness side connector terminal No.1 and the body ground.
OK: System voltage
Is the check result normal?
Go to Step 5.
Go to Step 4.
 
STEP 4. Wiring harness check
Check the wiring harness between the battery and the C-408 ETACS-ECU connector for damage or other problem.
Is the wiring harness in good condition?
Go to Step 8.
Repair damage or other problem in the wiring harness. Then go to Step 8.
 
STEP 5. Scan tool MB991958 CAN bus diagnostics
Use scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 7.
Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting/CAN Bus Diagnostics Table ). On completion, go to Step 6.
 
STEP 6. Check whether the DTC is stored again after repairing the CAN bus line.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is stored.
Is DTC C2101 stored?
Go to Step 7.
The procedure is complete.
 
STEP 7. Check whether the DTC is stored again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is stored.
Is DTC C2101 stored?
Replace AWD-ECU (Refer to ). Then go to Step 8.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 8. Check whether the DTC is stored again.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is stored.
Is DTC C2101 stored?
Diagnose again from Step 1.
The procedure is complete.