ON-BOARD DIAGNOSIS SYSTEM (IMMOBILIZER SYSTEM) MALFUNCTION DIAGNOSIS FUNCTION

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DTC Table

  Caution
  • Always use the Mazda Modular Diagnostic System (M-MDS) to verify DTCs even if the security light display a DTC. If the security light itself has a malfunction, it is possible that a DTC may not be properly displayed. There are certain DTCs which can only be verified using the Mazda Modular Diagnostic System (M-MDS), not the security light.
  • DTCs for the immobilizer system that are stored in the instrument cluster and PCM are cleared when the ignition switch is turned from the ON to the LOCK (ACC) position.

  Note
  • If two or more malfunctions are detected as a result of malfunction diagnosis, only the DTC with the lowest number of those detected will be displayed by the security light. However, multiple DTCs are stored at the same time.
  • If two or more immobilizer system DTCs are verified, first repair the part indicated by the security light displayed DTC. After completely repairing one location, turn the ignition switch from the LOCK to the ON position and perform immobilizer system malfunction diagnosis.
  • In the approx. 1 min after detecting a malfunction and before displaying the DTC, the security light will illuminate or flash the following patterns:

  Security light flashing pattern (Before displaying DTC) | DTC
  --- | ---
  | 11, 12, 13, 14, 15, 16
  | 21, 22, 23

DTC | Detection condition
--- | ---
Security light flashing pattern | Mazda Modular Diagnostic System (M-MDS) display*
Instrument cluster | PCM
11 |  | B1681 | P1260 | No detected communication with the coil
12 |  | B2103 | P1260 | • Coil antenna malfunction • The PCM determined a malfunction in the coil antenna even though it is normal.
13 |  | B1600 | P1260 | The key ID number data cannot be read.
B2431 | P1260 | Key ID number registration error
14 |  | B1602 | P1260 | The instrument cluster cannot read key ID number data normally.
15 |  | B1601 | P1260 | The instrument cluster has detected unregistered key ID number.
16 |  | U2510 | P1260 | Communication error between the instrument cluster and the PCM (no response)
U1147 | P1260 | Communication error between the instrument cluster and the PCM (mismatched conditions)
21 |  | B1213 | P1260 | Only one key ID number is registered.
22 |  | B2141 | P1260 | Communication error between the instrument cluster and the PCM (data transfer error)
23 |  | B2139 | P1260 | ID number data in the PCM and the instrument cluster do not match.
Not illuminated | B1342 | - | Instrument cluster malfunction