P2798

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2798-858: Auxiliary Transmission Fluid Pump Control Circuit Low
P2798-858 - Auxiliary Transmission Fluid Pump Control Circuit Low

DESCRIPTION

Refer to the description for DTC P0297-865 P2797.





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





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If P2798-859 is also output, troubleshoot P2798-859 first.

PROCEDURE

1. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

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









Result:





B -- CHECK FOR INTERMITTENT PROBLEMS
A -- Continue to next step.

2. CHECK CONNECTOR CONNECTION CONDITION (OIL PUMP MOTOR CONTROLLER CONNECTOR)

NOTICE:
Before disconnecting the connectors, confirm that they are properly connected by checking that the locking claws are engaged and that the connectors cannot be pulled 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 -- Continue to next step.

4. CHECK HYBRID VEHICLE CONTROL ECU (VOLTAGE)

(a) Turn the power switch off.

(b) Disconnect connector A78 from the oil pump motor controller.





(c) Turn the power switch on (IG).

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

Standard voltage:





NOTICE:
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 -- CHECK HARNESS AND CONNECTOR
OK -- Continue to next step.

5. CHECK OIL PUMP MOTOR CONTROLLER

(a) Turn the power switch off.





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

Standard resistance:





NG -- REPLACE OIL PUMP MOTOR CONTROLLER Components

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

6. CHECK HARNESS AND CONNECTOR

(a) Turn the power switch off.





(b) Disconnect connector A74 from the hybrid vehicle control ECU.

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

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

7. CHECK FOR INTERMITTENT PROBLEMS

(a) Check for intermittent problems Check For Intermittent Problems.

NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

OK -- REPLACE OIL PUMP MOTOR CONTROLLER Components