P2797-865

L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P2797-865: Auxiliary Transmission Fluid Pump Control Performance

DTC P2797-865 - 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

WIRING DIAGRAM

INSPECTION PROCEDURE
CAUTION:
- Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT:
- Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.
- If P2797-865 and P2797-895 are output simultaneously, first troubleshoot P2797-895.

PROCEDURE

1. CHECK FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Read output DTCs.
(e) Read the freeze frame data (auxiliary battery voltage) of P2797-865.
Result:
+B is 10 V or more.
NG -- CHECK AUXILIARY BATTERY
OK -- Continue to next step.
2. CLEAR DTC
(a) Turn the power switch on (IG).
(b) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(c) Read output DTCs.
(d) Read the freeze frame data.
(e) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(f) Clear the DTCs.
NEXT -- Continue to next step.
3. CHECK DTC OUTPUT (HV)
(a) Check if the DTC is output several seconds (approximately 3 seconds) after the power switch is turned on (IG) or the ST-on state occurs.
Result:

C -- CHECK FOR INTERMITTENT PROBLEMS
B -- CHECK HARNESS AND CONNECTOR (OIL PUMP MOTOR CONTROLLER - OIL PUMP MOTOR)
A -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - OIL PUMP MOTOR CONTROLLER)

(a) Turn the power switch off.
(b) Disconnect connector A54 from the hybrid vehicle control ECU.
(c) Disconnect connector A55 from the oil pump motor controller.
(d) Turn the power switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard voltage:

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.
(f) Turn the power switch off.
(g) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(h) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HYBRID VEHICLE CONTROL ECU

(a) Connect the connector to the hybrid vehicle control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.
6. CHECK OIL PUMP MOTOR CONTROLLER

(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE OIL PUMP MOTOR CONTROLLER
OK -- Continue to next step.
7. CHECK HYBRID VEHICLE CONTROL ECU
(a) Turn the power switch on (IG).

(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:

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.
HINT: Perform this inspection with the hybrid vehicle control ECU connectors connected.

NG -- REPLACE HYBRID VEHICLE CONTROL ECU
OK -- Continue to next step.
8. CHECK OIL PUMP MOTOR CONTROLLER
(a) Turn the power switch off.
(b) Disconnect connector A54 from the hybrid vehicle control ECU.
(c) Connect the connector to the oil pump motor controller.
(d) Remove the OIL PMP relay from the engine room R/B No. 1.

(e) Apply battery voltage (12 V) directly to the 3 terminals of the relay block holder for the OIL PMP relay.

(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPLACE OIL PUMP MOTOR CONTROLLER
OK -- Continue to next step.
9. CHECK IF PART IS CORRECTLY GROUNDED
(a) Measure the resistance between the oil pump motor controller body and body ground.
Standard resistance:
There is continuity.
NG -- REPAIR OR REPLACE OIL PUMP MOTOR CONTROLLER
OK -- REPLACE OIL PUMP MOTOR CONTROLLER
10. CHECK HARNESS AND CONNECTOR (OIL PUMP MOTOR CONTROLLER - OIL PUMP MOTOR)

(a) Disconnect connectors from the oil pump motor controller.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:

(f) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
OK -- Continue to next step.
11. CHECK IF PART IS CORRECTLY GROUNDED
(a) Measure the resistance between the oil pump motor controller body and body ground.
Standard resistance:
There is continuity.
NG -- REPAIR OR REPLACE OIL PUMP MOTOR CONTROLLER
OK -- REPLACE OIL PUMP MOTOR CONTROLLER