DTC P2797-888: Auxiliary Transmission Fluid Pump Control Performance; DTC P2797-889: Auxiliary Transmission Fluid Pump Control Performance: Procedure

1. Connect an oscilloscope to the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.
   Fig 1: Identifying A75 And A74 Connector Terminals

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   Item	Contents
   Terminal	A74-33(OPST) - A75-7(E1)
   Equipment Setting	5 V/DIV., 5 ms./DIV.
   Condition	Power switch on (IG)

   Result

   Result	Proceed to
   There are no interruptions or distortions in the waveform. (Amount of noise is small.)	A
   There is an interruption or distortion in the waveform. (Amount of noise is large.)	B

B → ELIMINATE CAUSE OF NOISE 

A: Go to next step 

1. Check the connections of the oil pump motor controller connectors.
   Fig 2: 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.

   OK

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

NG → CONNECT SECURELY 

OK → See step   4