DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open [10/2022 - ]: Procedure

1. Perform the Active Test. Check that the electric water pump assembly is operating (vibrating).

   Powertrain > Engine > Active Test 

   Tester Display
   Control the Intercooler Water Pump

   OK

   The electric water pump assembly is operating (vibrating).

   HINT: 

   Use a sound scope if the operation is difficult to check.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  4

Result: 

OK 

See step  2

Pre-procedure1

• Disconnect the electric water pump assembly connector.
• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Switch Condition	Specified Condition	Result
  A28-2 (NWP) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  3

Pre-procedure1

• 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	Result
  A28-2 (NWP) - B27-46 (IWPI)	Always	Below 1 Ω	Ω
  A28-2 (NWP) or B27-46 (IWPI) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Disconnect the electric water pump assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A28-1 (PGND) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

Refer to PROCEDURE - Step 5

Result

Result: 

NG 

REPLACE EFI-MAIN NO. 3 RELAY 

Result: 

OK 

See step  6

Pre-procedure1

• Disconnect the electric water pump assembly connector.
• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Switch Condition	Specified Condition	Result
  A28-4 (+B) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  7

Pre-procedure1

• Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

• Measure the voltage according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
  *2	EFI-MAIN NO. 3 Relay

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  3 (EFI-MAIN NO. 3 relay) - Body ground	Always	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - EFI-MAIN NO. 3 RELAY) 

Result: 

OK 

See step  8

Pre-procedure1

• Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  1 (EFI-MAIN NO. 3 relay) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

Pre-procedure1

• Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
• Disconnect the electric water pump assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  5 (EFI-MAIN NO. 3 relay) - A28-4 (+B)	Always	Below 1 Ω	Ω
  5 (EFI-MAIN NO. 3 relay) or A28-4 (+B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY) 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR