DTC P023A-12: Charge Air Cooler Coolant Pump Control Circuit Short to Battery [11/2021 - ]: Procedure

1. Disconnect the electric water pump assembly connector.
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A33-3 (SWP) - Body ground	Ignition switch ON	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  3

Result: 

OK 

See step  2

1. Disconnect the electric water pump assembly connector.
2. Perform the Active Test using the GTS.

   Powertrain > Engine > Active Test 

   Tester Display
   Control the Intercooler Water Pump

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A33-3 (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 [11/2021 - ] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [11/2021 - ] 

1. Disconnect the electric water pump assembly connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A33-3 (SWP) or B49-45 (IWPO) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR