DTC Detection Logic
- The ECM received an invalid identification message from the immobilizer anti-theft device.
- The ECM received a key code error from the immobilizer anti-theft device.
- The ECM received a no key error from the immobilizer anti-theft device.
- Immobilizer anti-theft device has detected too many attempts to start vehicle with an invalid key. Engine start has been locked out.
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DTC |
CONSULT screen terms (Trouble diagnosis content) |
DTC detection condition |
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U0426-00 |
Invalid Data Received From Vehicle Immobilizer Control Module (Immobilizer ID invalid, key code error, no key error, lock mode error - condition exists) |
1 |
Diagnosis condition |
Continuously when ignition switch is ON or the engine is running |
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Signal (terminal) |
- |
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Threshold |
ECM cannot receive feedback message from immobilizer within expected period of time or ECM receives feedback from immobilizer, but message indicates communication error. |
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Diagnosis delay time |
Diagnostic runs continuously when the engine is running. |
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2 |
Diagnosis condition |
Continuously when ignition switch is ON or the engine is running. |
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Signal (terminal) |
- |
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Threshold |
ECM verification process at end of ignition ON communication fails 5 times. |
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Diagnosis delay time |
Diagnostic runs continuously when the engine is running. |
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3 |
Diagnosis condition |
Continuously when ignition switch is ON or the engine is running. |
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Signal (terminal) |
- |
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Threshold |
ECM receives message from immobilizer indicating key programmed in transponder carries wrong key code. |
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Diagnosis delay time |
Diagnostic runs continuously when the engine is running. |
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4 |
Diagnosis condition |
Continuously when ignition switch is ON or the engine is running. |
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Signal (terminal) |
- |
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Threshold |
ECM receives message from immobilizer indicating no key is programmed in transponder. |
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Diagnosis delay time |
Diagnostic runs continuously when the engine is running. |
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