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2008 - MX-5 - Body and Accessories

SECURITY LIGHT 23, DTC B2139/P1260 [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]



SECURITY LIGHT: 23

ID number data in the PCM and the instrument cluster do not match.

DTC: B2139/P1260

DETECTION CONDITION

  • ID number data in the instrument cluster and the PCM are different.

POSSIBLE CAUSE

  • Necessary procedures were not performed using the M-MDS after replacing the PCM.

  • Instrument cluster malfunction

  • PCM malfunction


Diagnostic Procedure



STEP

INSPECTION

ACTION

1

    VERIFY DTC
  • Are either U1900 or U0073, or both, displayed, by either the instrument cluster or the PCM, or both?

Yes

Perform troubleshooting according to the corresponding DTC inspection.

(See DTC U0073, U2516 [MULTIPLEX COMMUNICATION SYSTEM].)

No

Go to the next step.

2

Yes

Go to the next step.

No

DTC troubleshooting completed.

3

Yes

No

DTC troubleshooting completed.

4

    VERIFY DTC
  • Is the DTC displayed again?

    • Security light: 23

    • M-MDS: B2139/P1260

Yes

No

DTC troubleshooting completed.




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