DTC P026A-00: Charge Air Cooler Efficiency Below Threshold [09/2023 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

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

   HINT: 

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

Result: 

A 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2023 - ] 

Result: 

B 

See step  2

Pre-procedure1

• Remove the No. 1 turbo pressure sensor.

  HINT: 

  Do not disconnect the connector.

• 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

Post-procedure1

• None

Result: 

B 

See step  9

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 INVERTER WATER PUMP ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

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 INVERTER WATER PUMP ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

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 [09/2023 - ] 

Result: 

NG 

REPAIR COOLANT LEAK 

Pre-procedure1

• None

• Clear the DTCs after recording the Freeze Frame Data and DTC.

  Powertrain > Engine > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

• Turn the ignition switch off and wait for at least 30 seconds.

Result: 

NEXT 

See step  8

Pre-procedure1

• Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

• Read the pending DTCs.

  Powertrain > Engine > Trouble Codes 

  Result

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

Post-procedure1

• None

Result: 

A 

END 

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [09/2023 - ] 

Refer to INSPECTION [09/2023 - ]

Result

Result: 

NG 

REPLACE NO. 1 TURBO PRESSURE SENSOR. Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  10

Pre-procedure1

• Disconnect the No. 1 turbo pressure sensor 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
  C41-4 (THIM) - C26-82 (THIM)	Always	Below 1 Ω	Ω
  C41-2 (E2) - C26-84 (EPIM)	Always	Below 1 Ω	Ω
  C41-4 (THIM) or C26-82 (THIM) - 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 [09/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR