: The anti-theft indicator light (often shaped like a key or reading "Security") will either stay solid or flash rapidly when the ignition switch is turned to the "ON" position.
If the B1766 code relates to a PLC memory issue, it might be caused by a low battery backup, leading to memory loss. Check if the "BAT" LED is illuminated on your controller.
If you have replaced a faulty ETACS-ECU with a used donor unit and are continually locked out by code B1766, standard OBD-II programming tools may fail. In this advanced scenario, professional locksmiths use an .
If the issue stems from an incorrect key, you must wipe the vehicle's immobilizer memory and register all keys simultaneously.
Leo had finally found the perfect deal on a used Mitsubishi Pajero key at a local salvage yard. His original had been lost to the bottom of a lake, and the dealership price for a brand-new one was eye-watering. He sat in his driveway, optimistic, with his laptop and a scanner connected to the car’s brain. mitsubishi b1766 verified
The Mitsubishi Diagnostic Trouble Code (DTC) refers to a "Transponder registered for other vehicle"
He went through the steps, following every forum guide he could find. But as he tried to program the used key, the dashboard remained dark. The engine wouldn't even mimic a crank. When he finally pulled the diagnostic report, a single code stared back at him: .
: This code is most frequently encountered when a car owner tries to use a "second-hand" ETACS-ECU or a used key from a donor car without proper EEPROM cloning or VIN rewriting. Common Fixes and Procedures
: The immobilizer or security warning light on the dashboard may flash or stay illuminated. : The anti-theft indicator light (often shaped like
: If the ECU cannot learn new codes or continues to misidentify keys, the immobilizer-ECU may need replacement. Code No.B1766: Transponder registered for other vehicle
, the following sequence is used to verify and fix the issue: Potential Outcome All Keys Registration Use a professional diagnostic tool (like M.U.T.-III ) to register all available keys. CAN Bus Diagnostics
The official Mitsubishi service manuals, which serve as the primary "verified" source for diagnosing this code, list the following as the most probable causes:
If you are using a PLC, open . Go to the diagnostics section and check the Error History. This will provide more context on which specific register is associated with the 1766 flag. 3. Clear the Alarm/Error Code If you have replaced a faulty ETACS-ECU with
Let's analyze each one in more depth.
Measure resistance from the connector (harness side) back to the SRS ECU pins (using wiring diagram). You should see less than 0.5 ohms on both signal and ground wires. High resistance indicates a wiring break or corroded terminal.
The most frequent cause is trying to program or start the vehicle with a key that contains an internal transponder chip (such as an ID46 or ID44 chip) already hard-coded to a different car's security system. Once a Mitsubishi transponder chip completes its initial write-cycle to an engine control network, it locks down and cannot be loosely transferred to another car. 2. Mismatched Used Module Swaps