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DTC B1861: Battery Fail
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
TROUBLE JUDGMENT
Check Conditions
  • Ignition switch: From OFF to ON
Judgment Criterion
  • When the system determines a voltage drop in the TCU battery.
noteThis DTC will be output when the TCU detects the TCU battery going flat.
 
 
TROUBLESHOOTING HINTS
  • The TCU battery may be defective
  • The TCU may be defective
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check whether DTC B1860 is set.
(1)
cautionTo 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).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn the ignition switch to the "ON" position.
(3) Check whether TCU DTC B1860 is set.
Is DTC B1860 set?
Troubleshoot DTC B1860 (Refer to ).
Replace the TCU battery (Refer to ). Then go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Check again if the DTC is set in the TCU.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
(3) Check the DTC.
Is the DTC set?
Replace the TCU (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).