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DTC B1860: Battery Connection
 
 
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 that the TCU battery is disconnected.
 
 
TROUBLESHOOTING HINTS
  • The TCU battery improperly connected
  • The TCU battery may be defective
  • The TCU may be defective
 
 
DIAGNOSIS
STEP 1. Check TCU battery connector.
Is the check result normal?
Go to Step 2.
Repair the connector or replace the TCU battery (Refer to ).
 
STEP 2. Check TCU battery.
(1) Remove the TCU battery (Refer to ).
(2) Connect a voltmeter between the TCU battery connector terminals, and check whether a needle of analog tester fluctuates.
Is the check result normal?
Go to Step 3.
Replace the TCU battery (Refer to ).
 
STEP 3. 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)
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) Erase the DTC.
(3) Turn the ignition switch from OFF position to ON position.
(4) 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 ).