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The immobilizer will not communicate with ECU?

Tiny
DENNIS ALFORD
  • MEMBER
  • 2002 HONDA CIVIC
  • 1.4L
  • 4 CYL
  • 2WD
  • MANUAL
  • 225,000 MILES
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.
Tuesday, June 13th, 2023 AT 2:39 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 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
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Tuesday, June 13th, 2023 AT 9:02 PM
Tiny
DENNIS ALFORD
  • MEMBER
  • 3 POSTS
Yes, ECU had 5 speed stick.
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Wednesday, June 14th, 2023 AT 2:56 AM
Tiny
DENNIS ALFORD
  • MEMBER
  • 3 POSTS
ECU behind glove box changed, immobilized changed.
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Wednesday, June 14th, 2023 AT 5:48 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 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
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Thursday, June 15th, 2023 AT 10:32 PM

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