DTC P2797-881: Auxiliary Transmission Fluid Pump Control Performance: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   P2797-881 only is output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P2797-865, 888, 889, 890, 895	Auxiliary Transmission Fluid Pump Control Performance
   P2798-858	Auxiliary Transmission Fluid Pump Control Circuit Low
   P2799-859	Auxiliary Transmission Fluid Pump Control Circuit High
   P3154-896	Transmission Oil Pump Motor Driver Temperature High
   P3175-862	Transmission Oil Pump Motor Coil Temperature Sensor Circuit
   P3176-863	Transmission Oil Pump Motor Coil Temperature Sensor Circuit Low
   P3177-864	Transmission Oil Pump Motor Coil Temperature Sensor Circuit High

B → See step   14 

A: Go to next step 

1. Check the connections of the oil pump motor controller connectors.
   Fig 1: Locating Oil Pump Motor Controller Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connectors are connected securely and there are no contact problems.

   HINT: 

   For connector A, when connecting it, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check the connections of the hybrid vehicle control ECU connectors.
   Fig 2: Identifying Hybrid Vehicle Control ECU Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connectors are connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
   Fig 3: A74 & A78 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connector A74 from the hybrid vehicle control ECU.
3. Disconnect connector A78 from the oil pump motor controller.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A74-32 (OPM1) - Body ground	Power switch on (IG)	Below 1 V
   A74-33 (OPST) - Body ground	Power switch on (IG)	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU and oil pump motor controller connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

6. Turn the power switch off.
7. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   A74-32 (OPM1) - A78-6 (SIG)	Power switch off	Below 1 Ω
   A74-33 (OPST) - A78-7 (OPST)	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   A74-32 (OPM1) - Body ground and other terminals	Power switch off	10 kΩ or higher
   A74-33 (OPST) - Body ground and other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check if there is an open circuit in the fusible link (OIL PMP) in the engine room No. 1 junction block.
   Fig 4: Identifying Fusible Link (Oil Pump)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   There is no open circuit in the fusible link (OIL PMP).

NG → REPLACE FUSIBLE LINK BLOCK ASSEMBLY 

OK: Go to next step 

1. Remove the OIL PMP relay from the engine room No. 5 relay block.
   Fig 5: Identifying OIL PMP Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 6: Inspecting Oil Pump Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 - 2	Always	151 to 203 Ω
   3 - 5	Auxiliary battery voltage is not applied between terminals 1 and 2.	10 kΩ or higher
   	Auxiliary battery voltage is applied between terminals 1 and 2.	Below 1 Ω

NG → See step   16 

OK: Go to next step 

NG → See step   15 

OK: Go to next step 

1. Install the OIL PMP relay to the engine room No. 5 relay block.
   Fig 7: Identifying OIL PMP Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connector A78 from the oil pump motor controller.
   Fig 8: Identifying A78 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A78-5 (+B) - Body ground	Power switch on (IG)	11 to 14 V

5. Turn the power switch off.
   Fig 9: No. 5 Relay Block & A78 Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Remove the OIL PMP relay from the engine room No. 5 relay block.
7. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   Engine room No. 5 relay block OIL PMP relay terminal 3 - A78-5 (+B)	Power switch off	Below 1 Ω
   Engine room No. 5 relay block OIL PMP relay terminal 2 - Body ground	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   Engine room No. 5 relay block OIL PMP relay terminal 3 - Body ground	Power switch off	10 kΩ or higher

8. Disconnect connector A74 from the hybrid vehicle control ECU.
   Fig 10: A74 & No. 5 Relay Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Switch Condition	Specified Condition
   A74-24 (OPM2) - Engine room No. 5 relay block OIL PMP relay terminal 1	Power switch off	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Switch Condition	Specified Condition
   A74-24 (OPM2) or Engine room No. 5 relay block OIL PMP relay terminal 1 - Body ground	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch on (IG).
2. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
3. Read and record the DTCs and freeze frame data.
4. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
5. Clear DTCs and freeze frame data.

NEXT: Go to next step 

1. Select the following menu items: Powertrain / Hybrid Control / Active Test / Activate the Oil Pump (500 RPM), Activate the Oil Pump (1000 RPM).
2. Select the following menu items: All Data / OPM Target Revolution, OPM Revolution.
3. Perform the "Activate the Oil Pump (500 RPM)" and "Activate the Oil Pump (1000 RPM)" active tests.
   NOTE:

   Make sure that the auxiliary battery is not discharged.

   OK

   "OPM Target Revolution" and "OPM Revolution" values are almost equal.

   Active Test	Data List
   Oil Pump	OPM Target Revolution	OPM Revolution
   500	500	500
   1000	1000	1000

NG → See step   15 

OK: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK: Go to next step 

1. Check for fluid leaks from the hybrid vehicle transmission assembly.

   OK

   There are no fluid leaks.

NG → See step   17 

OK → See step   13