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Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 125 (Engine Control System - Diagnostic Codes (P0190-P02EE)) >> SFI System >> DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open [11/2021 - ] >> Monitor Description

Monitor Description

WARNING: This page is about a different car, the 2025 Lexus NX 350, 2024 Lexus NX 350, 2023 Lexus NX 350, and 2022 Lexus NX 350. However, it is still accessible from the selected car via links, so may be relevant.

The ECM receives a frequency signal (IWPI) from the electric water pump assembly and calculates the speed of the electric water pump assembly. As the frequency signal (IWPI) is 4 Hz when the electric water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the electric water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped. If the electric water pump assembly speed is calculated to be less than 10 rpm, the ECM judges that there is an open or short in the IWPI circuit and stores this DTC.

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