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HOMESERVICE MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 562 (ON-BOARD DIAGNOSTIC [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)])SECURITY LIGHT 16, DTC U2510/P1260 [IMMOBILIZER SYSTEM (KEYLESS ENTRY SYSTEM)]DIAGNOSTIC PROCEDURE
2010 Mazda 5 Sport, 2.3 L, Standard

Diagnostic Procedure

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Diagnostic Procedure
WARNING: This page is about a different car, the 2008 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.
DTC U2510/P1260 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, U0516, U2516, 16:Er12, 26:Er81, CAN Bus [MULTIPLEX COMMUNICATION SYSTEM] .)
No Replace the instrument cluster and perform the resetting procedure for the immobilizer system when replacing the instrument cluster.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION .)
(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM] .)
Go to the next step.
2 VERIFY DTC 
  • Using the registered key, turn the ignition switch to the ON position.
  • Is the DTC displayed?
    • Security light: 16
    • M-MDS: U2510/P1260
 Yes Replace the PCM and perform the resetting procedure for the immobilizer system when replacing the PCM.
(See PCM REMOVAL/INSTALLATION [L3] .)
(See IMMOBILIZER SYSTEM COMPONENT REPLACEMENT/KEY ADDITION AND CLEARING [KEYLESS ENTRY SYSTEM] .)
No DTC troubleshooting completed.
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.