P0868-866
L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0868-866: Transmission Fluid Pressure Low
DTC P0868-866 - Transmission Fluid Pressure Low
DTC P0868-894 - Transmission Fluid Pressure Low
DESCRIPTION
For a description of the hybrid vehicle transmission assembly, P0731-871.
WIRING DIAGRAM
Refer to wiring diagram P0732-867 for P0732-867, P0731-871 for P0731-871, P0867-876 for P0867-876, P0722 for P722-854, P0A1B-168 for P0A1B-168, P2797-865 for P2797-865).
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.
PROCEDURE
1. CHECK DTC OUTPUT (HV)
(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) Check if DTCs are output.
Result:
YES -- GO TO DTC CHART
NO -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (HYBRID VEHICLE CONTROL ECU CONNECTOR)
(a) Turn the power switch off.
(b) Check the connections of the hybrid vehicle control ECU connectors.
Result:
The connectors are connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK CONNECTOR CONNECTION CONDITION (OIL PUMP MOTOR CONTROLLER CONNECTOR)
(a) Check the connections of the oil pump motor controller connectors.
Result:
The connectors are connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
4. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (SL1 SOLENOID VALVE, SL2 SOLENOID VALVE AND SP SOLENOID VALVE)
(a) Disconnect connector E84 from the hybrid vehicle control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION WIRE CONNECTOR)
OK -- Continue to next step.
5. CHECK FUSIBLE LINK (OIL PMP)
(a) Check that there is no open circuit in the fusible link (OIL PMP) in the engine room R/B No. 1.
OK:
There is no open circuit in the fusible link.
NG -- REPLACE FUSIBLE LINK
OK -- Continue to next step.
6. CHECK RELAY (OIL PMP)
(a) Remove the OIL PMP relay from the engine room R/B No. 1.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- REPLACE RELAY (OIL PUMP)
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (HV 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.
8. CHECK HYBRID VEHICLE TRANSMISSION ASSEMBLY (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:
NOTE: Turning the power switch on (IG) with the oil pump motor controller connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(d) Turn the power switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(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.
9. CHECK OIL PUMP MOTOR CONTROLLER (POWER SOURCE CIRCUIT)
(a) Turn the power switch off.
(b) Disconnect connector A55 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:
NOTE: Turning the power switch on (IG) with the oil pump motor controller connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(e) Turn the power switch off.
(f) Remove the OIL PMP relay from the engine room R/B No. 1.
(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:
(i) Disconnect connector A54 from the hybrid vehicle control ECU.
(j) Turn the power switch off.
(k) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK TRANSMISSION REVOLUTION SENSOR (SP2)
(a) Disconnect connector E84 from the hybrid vehicle control ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
OK -- CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY)
NG -- Continue to next step.
11. CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION REVOLUTION SENSOR (SP2) CONNECTOR)
(a) Check the connection of the transmission revolution sensor (SP2) connector.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
12. CHECK HARNESS AND CONNECTOR (TRANSMISSION REVOLUTION SENSOR (SP2) - HV CONTROL ECU)
(a) Disconnect connector E27 from the transmission revolution sensor (SP2).
(b) Turn the power switch on (IG).
(c) 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 connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(d) Turn the power switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
13. CHECK CONNECTOR CONNECTION CONDITION (TRANSMISSION WIRE CONNECTOR)
(a) Check the connection of the transmission wire connector.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
14. CHECK HARNESS AND CONNECTOR (HV CONTROL ECU - TRANSMISSION WIRE)
(a) Disconnect connector E89 from the transmission wire.
(b) Turn the power switch on (IG).
(c) 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 connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
(d) Turn the power switch off.
(e) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
15. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY)
(a) Check the connection of the low voltage connector of the inverter with converter assembly.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
16. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip.
NOTE: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair procedure because this may cause a malfunction.
(b) Disconnect the low voltage connector from the inverter with converter assembly.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:
NOTE: Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
17. CHECK MOTOR RESOLVER
(a) Turn the power switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
NG -- CLEAR DTC
OK -- Continue to next step.
18. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)
(a) Check the connection of the motor resolver connector.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
19. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)
(a) Disconnect the motor resolver connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):
Standard resistance (Check for short):
HINT: The motor resolver is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
20. CLEAR DTC
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Read and record the DTCs and freeze frame data.
(d) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(e) Clear the DTCs.
NEXT -- Continue to next step.
21. SIMULATION TEST
(a) Turn the power switch on (READY).
(b) Select the following menu items: Powertrain / Hybrid Control / Data List / Motor(MG2) Revolution, Output Shaft Speed, Output Shaft Speed Calculated by Wheel Speed.
(c) Perform a stall test and road test, and read the data list.
NOTICE:
- Before inspection, sufficiently warm up the engine.
- Make sure to perform this procedure after the engine has been inspected and adjusted.
- Do not perform a stall test for 5 or more seconds.
- Perform a stall test on an asphalt surface or other place with a high friction coefficient (micro ) in order to prevent wheelspin.
HINT:
- When performing a road test, the vehicle speed should be 35 km/h (22 mph) or more.
- Avoid sudden acceleration and deceleration during a road test.
Result:
The "MG2 REV" value in the data list changes normally, and the "OUTPUT SHAFT" and "OUTPUT SHAFT(W)" values should be almost equal with a vehicle speed of 15 km/h (9 mph) or more.
NG -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
OK -- Continue to next step.
22. CHECK FOR INTERMITTENT PROBLEMS
(a) Check for intermittent problems Check For Intermittent Problems.
NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
OK -- Continue to next step.
23. CHECK FOR FLUID LEAK
(a) Check for fluid leaks from the hybrid vehicle transmission assembly.
OK:
There are no fluid leaks.
NG -- REPAIR OR REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
OK -- REPLACE HYBRID VEHICLE CONTROL ECU