DTC P26CB-71: Engine Coolant Pump Actuator Stuck [11/2022 - ]: 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 [11/2022 - ] 

Result: 

A 

See step  2

1. Check that the engine coolant level is between the FULL and LOW lines.

   Refer to ON-VEHICLE INSPECTION [11/2022 - ]

   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 ON-VEHICLE INSPECTION [11/2022 - ]

   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.
   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. Enter the following menus.

   Powertrain > Engine > Active Test 

   Active Test Display
   Activate the Electric Water Pump

   Data List Display
   Electric Water Pump Speed

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

   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

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the inverter water pump with motor assembly connector.
2. Turn the ignition switch to ON.
3. Measure the resistance according to the value(s) in the table below.

   Standard

   Tester Connection	Condition	Specified Condition
   C131-3 (SWP) - Body ground	Ignition switch ON	Resistance fluctuates*

   HINT: 

   • *: When the connector of the inverter water pump with motor assembly is disconnected, the ECM will enter fail-safe mode. When the ECM is in fail-safe mode, a continuous duty signal will be output and the resistance will fluctuate as the transistor inside the ECM is turned on an off.
   • If the resistance fluctuates while the ECM is in fail-safe mode after the connector of the inverter water pump with motor assembly is disconnected, it can be determined that the transistor is operating.
   • If the transistor is not operating, the ECM may be malfunctioning.
   • If the resistance fluctuates after turning the ignition switch to ON, it can be determined that the ECM is in fail-safe mode.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [11/2022 - ] 

Result: 

OK 

See step  8

Refer to REMOVAL [11/2022 - ]

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