DTC P026A-00: Charge Air Cooler Efficiency Below Threshold [11/2021 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P026A-00 is output	A
   DTC P026A-00 and other DTCs are output	B

   HINT: 

   If any DTCs other than P026A-00 are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 03/2023]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2023 - 03/2024]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2024 - ] 

Result: 

A 

See step  2

1. Remove the No. 1 turbo pressure sensor.

   HINT: 

   Do not disconnect the connector.

2. According to the display on the GTS, read the Data List.

   Powertrain > Engine > Data List 

   Tester Display
   Intake Air Temperature B1S1 (Turbo)

   Result

   Result	Proceed to
   Other than below	A
   Difference between value of Intake Air Temperature B1S1 (Turbo) and actual ambient air temperature is 10°C (18°F) or higher	B

Result: 

B 

See step  8

Result: 

A 

See step  3

1. Check for deformation and blockage of the intercooler cooling radiator assembly.

   OK

   Intercooler cooling radiator assembly does not have any deformation or blockage.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE INTERCOOLER COOLING RADIATOR ASSEMBLY 

Result: 

OK 

See step  4

1. According to the display on the GTS, read the Data List while the Active Test "Control the Intercooler Water Pump" is set to 85%.
   NOTE:

   Be sure to perform the inspection with the battery voltage at 11 V or higher.

   HINT: 

   If the battery voltage is low, the electric water pump assembly may stop operating.

   Powertrain > Engine > Active Test 

   Active Test Display
   Control the Intercooler Water Pump

   Data List Display
   Intercooler Water Pump Speed

   Result

   GTS Operation	Intercooler Water Pump Speed	Proceed to
   85%	4000 rpm or less	A
   	7000 rpm or higher	B
   	Other than above	C

Result: 

A 

REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

C 

See step  7

Result: 

B 

See step  5

1. Check the coolant (for intercooler) level.

   Refer to PROCEDURE - Step 2

   Result

   Result	Proceed to
   At or below reservoir tank LOW level	A
   At or above reservoir tank LOW level	B

Result: 

B 

REPLACE ELECTRIC WATER PUMP ASSEMBLY. Refer to  REMOVAL [11/2021 - ] 

Result: 

A 

See step  6

1. Check the turbocharger and intercooler cooling system for coolant leaks.

   Refer to PROCEDURE - Step 1

   OK

   No leaks in turbocharger and intercooler cooling system.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

ADD COOLANT. Refer to  REPLACEMENT [11/2021 - ] 

Result: 

NG 

REPAIR COOLANT LEAK 

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

2. Turn the ignition switch off and wait for at least 30 seconds.
3. Start the engine and warm it up.
4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
5. Read the pending DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTC P026A-00 is output	B

Result: 

A 

END 

Result: 

B 

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

1. Inspect the No. 1 turbo pressure sensor (intake air temperature sensor).

   Refer to PROCEDURE - Step 1

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 TURBO PRESSURE SENSOR. Refer to  PROCEDURE - Step 1 

Result: 

OK 

See step  9

1. Disconnect the No. 1 turbo pressure sensor 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
   B71-4 (THIM) - B49-82 (THIM)	Always	Below 1 Ω
   B71-2 (E2) - B49-84 (EPIM)	Always	Below 1 Ω
   B71-4 (THIM) or B49-82 (THIM) - Body ground and 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