P2797-889

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2797-888: Auxiliary Transmission Fluid Pump Control Performance

DTC P2797-888 - Auxiliary Transmission Fluid Pump Control Performance

DTC P2797-889 - Auxiliary Transmission Fluid Pump Control Performance

DESCRIPTION

The oil pump motor controller controls the rotation speed of the oil pump motor (three-phase brushless motor) in accordance with rotation speed request signals sent from the hybrid vehicle control ECU. The controller also outputs the oil pump motor status as a signal to the hybrid vehicle control ECU.













MONITOR DESCRIPTION

The hybrid vehicle control ECU monitors the operation of the auxiliary transmission fluid pump. If the hybrid vehicle control ECU detects a malfunction of the auxiliary transmission fluid pump control circuit, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)





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






Result:






B -- CLEAR NOISE CONDITIONS
A -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (OIL PUMP MOTOR CONTROLLER CONNECTOR)
NOTE: Before disconnecting the connectors, confirm that they are properly connected by checking that the locking claws are engaged and that the connectors do not pull out.





(a) Check the connections of the oil pump motor controller connectors.
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 -- Continue to next step.
3. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)





(a) 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 -- REPLACE OIL PUMP MOTOR CONTROLLER