DTC P2799-859: Auxiliary Transmission Fluid Pump Control Circuit High: Procedure

1. Turn the power switch off.
   Fig 1: Identifying A55 Oil Pump Motor Controller Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connector A55 from the oil pump motor controller.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   +B (A55-5) - Body ground	10 to 14 V

   NOTE:

   Turning the power switch on (IG) with the oil pump motor controller connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

NG → See step   7 

OK: Go to next step 

1. Disconnect connector A54 from the hybrid vehicle control ECU.
   Fig 2: Identifying A54 And A55 Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connector A55 from the oil pump motor controller.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   OPST (A54-2) - Body ground	Below 1 V

   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

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

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   OPST (A54-2) - OPST (A55-7)	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   OPST (A54-2) or OPST (A55-7) - Body ground	10 kΩ or more

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch off.
   Fig 3: Identifying Hybrid Vehicle Control ECU Connector Terminals

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

   Standard resistance

   Tester Connection	Specified Condition
   OPST (A54-2) - +B1 (A54-46)	6.5 to 8.5 kΩ

NG → See step   13 

OK: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Read and record the DTCs and freeze frame data.
4. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
5. Clear the DTCs.

NEXT: Go to next step 

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. Read output DTCs.

   Result

   DTC P2799-859 is output.

YES → See step   13 

NO: Go to next step 

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

YES → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

NO → See step   14 

1. Check that there is no open circuit in the fusible link (OIL PMP) in the engine room R/B No. 1.
   Fig 4: Identifying Fusible Link (Oil Pump)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

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

NG → REPLACE FUSIBLE LINK 

OK: Go to next step 

1. Turn the power switch off.
   Fig 5: Identifying A55 Oil Pump Motor Controller Connector And OIL PMP Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the OIL PMP relay from the engine room R/B No. 1.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   Engine room R/B No. 1 OIL PMP relay terminal 3 - +B (A55-5)	Below 1 Ω
   Engine room R/B No. 1 OIL PMP relay terminal 3 - Body ground	10 kΩ or more

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

   Standard resistance

   Tester Connection	Specified Condition
   Engine room R/B No. 1 OIL PMP relay terminal 2 - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. 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	Specified Condition
   1 - 2	151 to 203 Ω
   3 - 5	10 kΩ or more
   3 - 5	Below 1 Ω (Apply battery voltage between 1 and 2)

NG → REPLACE RELAY (OIL PMP) 

OK: Go to next step 

1. Turn the power switch on (IG).
   Fig 7: Identifying OIL PMP Relay

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

   Standard voltage

   Tester Connection	Specified Condition
   Engine room R/B No. 1 OIL PMP relay terminal 5 - Body ground	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch on (IG).
   Fig 8: Identifying OIL PMP Relay

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

   Standard voltage

   Tester Connection	Specified Condition
   Engine room R/B No. 1 OIL PMP relay terminal 1 - Body ground	10 to 14 V

OK → CHECK FOR INTERMITTENT PROBLEMS 

NG: Go to next step 

1. Turn the power switch off.
   Fig 9: Identifying A54 Hybrid Vehicle Control ECU And OIL PMP Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connector A54 from the hybrid vehicle control ECU.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   OPM2 (A54-58) - Engine room R/B No. 1 OIL PMP relay terminal 1	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   OPM2 (A54-58) or Engine room R/B No. 1 OIL PMP relay terminal 1 - Body ground	10 kΩ or more

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   13