The immobilizer will not communicate with ECU?

2002 HONDA CIVIC
225,000 MILES • 1.4L • 4 CYL • 2WD • MANUAL
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DENNIS ALFORD
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  • 3 POSTS
I replaced the immobilizer and the ECU my cars in the Honda dealership when they plug their scanner, and it will not communicate with the ECU they currently have three of them with the same problem and mine has been there 5 weeks now.
Jun 13, 2023 at 2:39 PM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

When you say the ECU was replaced, are you referring to the PCM/ECM? I ask because the immobilizer is integral to the ECM (or PCM with auto trans).

Did you replace the immobilizer receiver inside the bezel around the ignition switch?

Let me know.

Take care,

Joe
Jun 13, 2023 at 9:02 PM
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DENNIS ALFORD
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  • 3 POSTS
Yes, ECU had 5 speed stick.
Jun 14, 2023 at 2:56 AM
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DENNIS ALFORD
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  • 3 POSTS
ECU behind glove box changed, immobilized changed.
Jun 14, 2023 at 5:48 AM
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JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
When you say immobilizer, are you referring to the sensor at the ignition switch? I ask because both of my manuals are saying it is integral to the PCM.

Joe
Jun 15, 2023 at 10:32 PM