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Home >> Lexus >> 2025 >> NX 350h >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Stop And Start System - Diagnostic Codes (1 Of 2)) >> Stop And Start System >> DTC P1644-00: ECU Malfunction (Starter Circuit) [03/2023 - ] >> Monitor Strategy

Monitor Strategy

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Related DTCs P1644: Engine stop and start ECU internal starter relay circuit functional
Required Sensors/Components (Main) Engine stop and start ECU
Required Sensors/Components (Related) -
Frequency of Operation Continuous
Duration 1 second: Case2
0.2 seconds: Case1, Case3, Case4, Case5, Case6, Case7
MIL Operation Immediate
Sequence of Operation None
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