DTC P023A-14: Charge Air Cooler Coolant Pump Control Circuit Short to Ground or Open [10/2022 - 11/2023]: Procedure
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- INSPECT ECM (INTERNAL CIRCUIT)
- Disconnect the electric water pump assembly connector.
- Perform the Active Test using the GTS.
Powertrain > Engine > Active Test
Tester Display Control the Intercooler Water Pump - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A85-3 (SWP) - Body ground Active Test OFF → ON Active Test OFF: Resistance stabilized → ON: Resistance changes* HINT:
*: The transistor inside the ECM performs duty control according to the Active Test being operated. The resistance of the SWP terminal changes while the Active Test is on due to duty control. If the resistance is stable while the Active Test is off and changes while the Active Test is on, the transistor is working correctly. If the transistor does not operate when the Active Test is on, there may be a malfunction in the ECM.
Result
Proceed to OK NG
Result:
OK
REPLACE ELECTRIC WATER PUMP ASSEMBLY
Refer to REMOVAL [10/2022 - ]
Result:
NG
See step 2
- CHECK HARNESS AND CONNECTOR (ELECTRIC WATER PUMP ASSEMBLY - ECM)
- Disconnect the electric water pump assembly connector.
- Disconnect the ECM connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A85-3 (SWP) - C88-45 (IWPO) Always Below 1 Ω A85-3 (SWP) or C88-45 (IWPO) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [10/2022 - 11/2023]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR