DTC P2600-71: Motor/Generator Coolant Pump "A" Actuator Stuck; DTC P2B86-00: Coolant Pump "A" Overspeed/Air in System [12/2019 - 11/2023]: Procedure

1. Check for DTCs.

   Powertrain > Hybrid Control > Trouble Codes 

   Result

   Result	Proceed to
   DTC P2600-71 or P2B86-00 only is output, or DTCs except the ones in the tables below are also output.	A
   DTC P2600-71 or P2B86-00 and any of the DTCs in the following table are output at the same time.	B

   Relevant DTC
   P274A-11	Transmission Fluid Temperature Sensor "C" Circuit Short to Ground
   P274A-15	Transmission Fluid Temperature Sensor "C" Circuit Short to Auxiliary Battery or Open
   P274A-1C	Transmission Fluid Temperature Sensor "C" Voltage Out of Range
   P274A-1F	Transmission Fluid Temperature Sensor "C" Circuit Intermittent

   HINT: 

   The transmission fluid temperature sensor value is used to detect DTC P2600-71 and P2B86-00. Check that the transmission fluid temperature sensor operates normally, as the detection condition for DTC P2600-71 or P2B86-00 may be mistakenly detected due to a malfunction in the transmission fluid temperature sensor.

2. Turn the ignition switch off.

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 09/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2020 - 10/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2021 - 11/2023] 

Result: 

A 

See step  2

1. Check that there is no clogging in the oil pipes connected to the oil pump with motor assembly, oil cooler assembly and hybrid vehicle transaxle assembly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE OIL PIPE 

Result: 

OK 

See step  3

See step  3

Result

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  4

Refer to PROCEDURE - Step 1

Result

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  5

See step  5

Result

Result: 

NG 

See step  11

Result: 

OK 

See step  6

See step  6

Result

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

See step  7

Result

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

See step  8

Result

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

1. Set the Duty ratio to 90%.

   HINT: 

   The active test is not performed when the Duty ratio is 50% or lower or 95% or higher, or the ambient temperature is 0°C (30°F) or lower.

   Powertrain > Hybrid Control > Active Test 

   Tester Display
   Control the Motor/Generator Cooling Oil Pump

2. Confirm that the oil pump with motor assembly is operating.

   OK

   The oil pump with motor assembly is operating.

3. Turn the ignition switch off.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  13

Result: 

OK 

See step  10

1. Remove the oil pump with motor assembly.

   Refer to REMOVAL [12/2019 - 11/2023]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Oil Pump with Motor Assembly)

   Standard Resistance

   Tester Connection (Tester Probe Polarity)	Condition	Specified Condition
   C38-3 (OPM1) (+) - C38-4 (L) (-)	Ignition switch off	10 kΩ or higher

   NOTE:

   Make sure to check the polarity of each terminal (positive (+) or negative (-)) before connecting a tester.

3. Install the oil pump with motor assembly.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

NG 

REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 11/2023] 

See step  9

Result

Result: 

NG 

REPLACE FUSE (OIL PMP) 

Result: 

OK 

See step  12

See step  10

Result

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PUMP WITH MOTOR ASSEMBLY POWER SOURCE CIRCUIT) 

Result: 

NG 

REPLACE RELAY (OIL PMP) 

1. Remove the oil pump with motor assembly.

   Refer to REMOVAL [12/2019 - 11/2023]

2. Set the Toyota Electrical Tester to diode check mode.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Oil Pump with Motor Assembly)

   Standard Voltage

   Tester Connection (Tester Probe Polarity)	Condition	Specified Condition
   C38-3 (OPM1) (-) - C38-4 (L) (+)	Ignition switch off	1.5 V or higher

   NOTE:

   Make sure to check the polarity of each terminal (positive (+) or negative (-)) before connecting a tester.

4. Install the oil pump with motor assembly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

OK 

See step  14

1. Set the Duty ratio to 90%.

   HINT: 

   The active test is not performed when the Duty ratio is 50% or lower or 95% or higher, or the ambient temperature is 0°C (30°F) or lower.

   Powertrain > Hybrid Control > Active Test 

   Tester Display
   Control the Motor/Generator Cooling Oil Pump

2. Connect an oscilloscope to the C38 oil pump with motor assembly connector and check the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component with harness connected (Hybrid Vehicle Control ECU)

   -

   -

   Item	Content
   Tester Connection	A31-21 (OPM1) - H67-3 (E1)
   Equipment Setting	10 V/DIV., 20 ms./DIV.
   Condition	Ignition switch ON During Active Test

   Result

   Result	Proceed to
   11 to 14 V	A
   Except above	B

3. Turn the ignition switch off.

Result: 

A 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

B 

REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 11/2023]