P0710

L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0710-855,P0712-856,P0713-857: Transmission Fluid Temperature Sensor "A" Circuit

DTC P0710-855 - Transmission Fluid Temperature Sensor "A" Circuit

DTC P0712-856 - Transmission Fluid Temperature Sensor "A" Circuit Low Input

DTC P0713-857 - Transmission Fluid Temperature Sensor "A" Circuit High Input

DESCRIPTION

The transmission fluid temperature sensor, which is installed in the valve body, is used to detect the fluid temperature of the transmission fluid pressure control circuit. The sensor signal is used by the hybrid vehicle control ECU to determine transmission fluid temperature.

MONITOR DESCRIPTION

These DTCs indicate an open or short in the transmission fluid temperature sensor circuit. The transmission fluid temperature sensor represents transmission fluid temperature as an electrical resistance value. Based on the resistance, the hybrid vehicle control ECU determines the transmission fluid temperature. The hybrid vehicle control ECU also detects an open or short in the transmission fluid temperature circuit based on the resistance. If the resistance value of the transmission fluid temperature sensor is outside a specified range, the hybrid vehicle control ECU interprets this as a fault in the transmission fluid sensor or wiring. The ECM will turn on the MIL and store a DTC.
HINT: The transmission fluid temperature can be checked using an OBD II scan tool or the Techstream.

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.
- Read freeze frame data using the Techstream. In the freeze frame data, some information about the engine conditions at the moment a malfunction occurred is recorded. This information can be helpful when troubleshooting.

PROCEDURE

1. READ VALUE USING TECHSTREAM (T/M OIL TEMP)
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Data List / T/M Oil Temperature.
(d) Read the data list.
Result:

OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (HV CONTROL ECU CONNECTOR)

(a) 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 HYBRID VEHICLE TRANSMISSION ASSEMBLY (TRANSMISSION FLUID TEMPERATURE SENSOR)

(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:

NOTICE:
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:

OK -- CHECK FOR INTERMITTENT PROBLEMS
NG -- Continue to next step.
4. 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.
5. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - HV CONTROL ECU)

(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:

Standard resistance (Check for short):

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE TRANSMISSION WIRE
6. CHECK FOR INTERMITTENT PROBLEMS
(a) Check for intermittent problems L110 Hybrid Vehicle Control System.
NG -- REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA
OK -- REPLACE HYBRID VEHICLE CONTROL ECU