Toyota Replacement ECM / PCM: Syncing the Immobilizer With the Pin 4–13 Jumper or the GTS Active Test
How to pair a replacement Toyota engine computer with the immobilizer box after installing it, on models that use a jumper and on newer models that need GTS.
When This Applies
After you replace the ECM or PCM on a Toyota, the replacement computer has to be synced with the separate immobilizer box before the vehicle will start. First confirm that the replacement has the same part number as the original and that it carries the correct VIN.
Jumper Method (Many Toyota Models)
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Turn the ignition on.
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Place a jumper in the OBD2 connector between pins 4 and 13.
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The cluster, airbag and other lights will start flashing. That is how you know it is working.
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Leave it for at least 30 minutes (about 35 is typical).
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Turn the ignition off, remove the jumper, and start the vehicle.
This works with a key that has already been started on that vehicle, not a brand-new key, and it does not need Toyota software.
Newer Models: Use GTS Instead
Some newer Toyotas, including a 2019 model, do not have these pins in the connector, so the jumper cannot be used. On these, use GTS Plus: run the active test that turns the TC/CG circuit on for 30 minutes or more with the ignition on, then cycle the ignition.
If the Vehicle Will Not Start Afterward
Contact AETools at https://aetools.us or call (913) 856-6678 with the vehicle year and model, the part numbers on the old and new computer, and which method you used.