DTC P26CB-71: Engine Coolant Pump Actuator Stuck [03/2022 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   DTC P26CB-71 is output	A
   DTC P26CB-71 and P26CE-37 are output
   DTC P26CB-71 and other DTCs are output	B

   HINT: 

   If any DTCs other than P26CB-71 are output, troubleshoot those DTCs first.

Result: 

B 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [03/2022 - 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. Check that the engine coolant level is between the FULL and LOW lines.

   Refer to PROCEDURE - Step 2

   Result

   Result	Proceed to
   Engine coolant level is above the LOW line	A
   Engine coolant level is below the LOW line	B

Result: 

A 

See step  6

Result: 

B 

See step  3

1. Check the areas around the engine and heater for engine coolant leaks.

   Refer to PROCEDURE - Step 1

   HINT: 

   If the engine oil is cloudy during the engine oil level dipstick check, it means that engine coolant has entered the engine lubrication system.

   OK

   No leaks.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  4

1. Fill the reservoir tank up to the FULL line with engine coolant.

   Refer to PROCEDURE - Step 5

   NOTE:

   Make sure not to add engine coolant when the engine is hot.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. Repair any engine coolant leaks.

   HINT: 

   Add engine coolant and perform air bleeding after repair.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  6

1. According to the display on the GTS, read the Data List while performing the Active Test.

   Powertrain > Engine > Active Test 

   Active Test Display
   Activate the Electric Water Pump

   Data List Display
   Electric Water Pump Speed

   Standard

   Active Test Operation	Electric Water Pump Speed
   3000 rpm	2000 rpm or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

See step  8

Result: 

NG 

See step  7

1. Disconnect the engine water pump assembly (water inlet housing) connector.
2. Perform the Active Test using the GTS.

   Powertrain > Engine > Active Test 

   Tester Display
   Activate the Electric Water Pump

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

   Standard

   Tester Connection	Condition	Specified Condition
   B31-2 (SWP) - Body ground	During Active Test	Resistance fluctuates*

   HINT: 

   • *: Using the Active Test, duty control of the transistors in the ECM will be performed. Due to the duty control, resistance of the SWP terminal will be unstable during the Active Test. If the resistance fluctuates while performing the Active Test, it can be determined that the transistor is operating. If the transistor does not operate during the Active Test, the ECM may be malfunctioning.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

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

Result: 

OK 

See step  8

Refer to REMOVAL [11/2021 - ]

HINT: 

When replacing any cooling system parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.

Result

Result: 

NEXT 

See step  9

1. Clear the DTCs.

   Powertrain > Engine > Clear DTCs 

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

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  10

1. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
2. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   HINT: 

   If no DTC is output, the repair has been successfully completed.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END