DTC P2600-71: Motor/Generator Coolant Pump "A" Actuator Stuck; DTC P2B86-00: Coolant Pump "A" Overspeed/Air in System [11/2021 - 03/2024]: 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 [11/2021 - 03/2024] 

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  1

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

1. Disconnect the oil pump with motor assembly connector.
2. Turn the ignition switch to ON.
3. According to the display on the GTS, perform the Active Test and set the duty to 90%.

   HINT: 

   The Active Test cannot be performed if the duty ratio is set to 50% or lower or 95% or higher, or if the ambient temperature is -10°C (14°F) or lower.

   Powertrain > Hybrid Control > Active Test 

   Tester Display
   Control the Motor/Generator Cooling Oil Pump

4. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Oil Pump with Motor Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B30-4 (L) - Body ground	Ignition switch ON During Active Test	11 to 14 V

   NOTE:

   Turning the ignition switch to ON with the oil pump with motor assembly connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

5. Turn the ignition switch off.
6. Reconnect the oil pump with motor assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  11

Result: 

OK 

See step  6

See step  9

Result

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

See step  10

Result

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

See step  11

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 [11/2021 - 03/2024]

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
   3 (OPM1) - 4 (L)	Ignition switch off	10 kΩ or higher
   3 (OPM1) - Body ground	Ignition switch off	10 kΩ or higher

3. Install the oil pump with motor assembly.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2021 - 03/2024] 

See step  3

Result

Result: 

NG 

REPLACE FUSE (OIL PMP) 

Result: 

OK 

See step  12

See step  4

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 [11/2021 - 03/2024]

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
   3 (OPM1) - 4 (L)	Ignition switch off	1.5 V or higher

4. Install the oil pump with motor assembly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2021 - 03/2024] 

Result: 

OK 

See step  14

1. Turn the ignition switch to ON.
2. 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

3. Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component with harness connected (Hybrid Vehicle Control ECU)

   -

   -

   Item	Content
   Tester Connection	A27-3 (OPM1) - D67-15 (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

4. Turn the ignition switch off.

Result: 

A 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [11/2021 - ] 

Result: 

B 

REPLACE OIL PUMP WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2021 - 03/2024]