P0712
K41B CVT: CONTINUOUSLY VARIABLE TRANSAXLE SYSTEM: P0712, P0713: Transmission Fluid Temperature Sensor "A" Circuit Low Input
DESCRIPTION
The CVT fluid temperature sensor converts the fluid temperature into a resistance value which is input into the ECM.
The sensor resistance changes with the transmission fluid temperature. As the temperature rises, the sensor resistance decreases. The ECM applies a voltage to the temperature sensor through ECM terminal THO1, and the ECM calculates the fluid temperature based on the voltage signal.
HINT
The CVT fluid temperature is likely to increase under conditions such as towing, climbing hills and in heavy traffic.
MONITOR DESCRIPTION
The CVT fluid temperature sensor converts the CVT fluid temperature to an electrical resistance value. Based on the resistance, the ECM determines the CVT fluid temperature and detects opens or shorts in the CVT fluid temperature circuit. If the resistance value of the CVT fluid temperature is less than 79 Ohms*1 or more than 156 kOhms*2, the ECM interprets this as a fault in the CVT fluid sensor or wiring. The ECM turns on the MIL and stores the DTC.
*1: 150°C (302°F) or more is indicated regardless of the actual CVT fluid temperature.
*2: -40°C (-40°F) is indicated regardless of the actual CVT fluid temperature.
HINT
The CVT fluid temperature can be checked on the Techstream display.
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
P0712:
P0713 Condition (A):
P0713 Condition (B):
TYPICAL MALFUNCTION THRESHOLDS
P0712:
P0713:
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
PROCEDURE
1. READ VALUE USING TECHSTREAM (A/T OIL TEMPERATURE 1)
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the Techstream to the DLC3.
(d) Turn the ignition switch to ON.
(e) Turn the Techstream on.
(f) Enter the following menus: Powertrain / Engine and ECT / Data List.
(g) In accordance with the display on the Techstream, read the Data List.
Result
B -- REPLACE ECM
A -- Continue to next step.
2. INSPECT CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY (ECM INPUT SENSOR RESISTANCE)
(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
HINT
If the resistance is outside the specified range at either of the CVT fluid temperatures shown in the table below, the driveability of the vehicle may be affected.
NG -- CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
OK -- Continue to next step.
3. REPLACE ECM P0705
NEXT -- Continue to next step.
4. PERFORM INITIALIZATION P0705
NEXT -- END
5. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)
(a) Disconnect the transmission wire connector from the transaxle.
(b) 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.
6. REPLACE CONTINUOUSLY VARIABLE TRANSAXLE ASSEMBLY P0711
NEXT -- Continue to next step.
7. PERFORM INITIALIZATION P0705
NEXT -- END