DTC B210D: Power Supply Low Battery: Diagnosis

Required Special Tools

MB991223: Wiring harness set
MB992006: Extra fine probe

STEP 1. Check battery.
Perform the battery test. Check the battery terminals for looseness or contamination.

Q: Is the check result normal?

YES: Go to Step 2.

NO: Repair the battery terminals or replace the battery.
STEP 2. Resistance measurement at the TCU connector (GND terminal).
1. Disconnect the TCU connector, and measure at the wiring harness side.
2. Check the resistance between the TCU connector (GND terminal) and body ground.
  OK: The resistance should be 2 ohms or less
3. Check the resistance between the TCU connector (GND2 terminal) and body ground.
  OK: The resistance should be 2 ohms or less
  
  Q: Is the check result normal?
  
  YES: Go to Step 3.
  
  NO: Repair the connector(s) or wiring harness.
STEP 3. Voltage measurement at the TCU connector (+B terminal).
1. Disconnect the TCU connector, and measure at the wiring harness side.
2. Check the voltage between the TCU connector (+B terminal) and body ground.
  OK: The voltage should measure approximately 12 volts (battery positive voltage).
  
  Q: Is the check result normal?
  
  YES: Go to Step 4.
  
  NO: Repair the connector(s) or wiring harness.
STEP 4. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the TCU.

CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
2. Erase the DTC.
3. Turn the ignition switch from OFF position to ON position.
4. Check the DTC.
  Q: Is the DTC set?
  
  YES: Replace the TCU (Refer to TCU ).
  
  NO: The trouble can be an intermittent malfunction (Refer to How to use Troubleshooting/inspection Service Points - HOW TO COPE WITH INTERMITTENT MALFUNCTION ).