DTC P023A-13: Charge Air Cooler Coolant Pump Control Circuit Open [12/2017 - 10/2020]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine / Active Test / Control the Intercooler Water Pump.

   Powertrain > Engine > Active Test 

   Tester Display
   Control the Intercooler Water Pump

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

   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

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   B2-2 (NWP) - Body ground	Engine switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [12/2017 - ] 

Result: 

NG 

See step  3

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
   B2-2 (NWP) - A95-20 (IWPI)	Always	Below 1 Ω
   B2-2 (NWP) or A95-20 (IWPI) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [12/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B2-1 (PGND) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Inspect the EFI-MAIN NO. 3 relay.

   Refer to ON-VEHICLE INSPECTION [12/2017 - 10/2023]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE EFI-MAIN NO. 3 RELAY 

Result: 

OK 

See step  6

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   B2-4 (+B) - Body ground	Engine switch on (IG)	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [12/2017 - ] 

Result: 

NG 

See step  7

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and junction block assembly.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  8

1. Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and junction block assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Remove the EFI-MAIN NO. 3 relay, A/F HTR relay, VVT NO. 1 relay and VVT NO. 2 relay from the No. 1 engine room relay block and junction block assembly.

   HINT: 

   Remove the A/F HTR relay, VVT NO. 1 relay and VVT NO. 2 relay connected between the checked terminals as the coil inside the relay influences the measurement value.

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   5 (EFI-MAIN NO. 3 relay) - B2-4 (+B)	Always	Below 1 Ω
   5 (EFI-MAIN NO. 3 relay) or B2-4 (+B) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

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