A340E Automatic Transmission System

A340E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P2741: Transmission Fluid Temperature Sensor "B" Performance
P2741 - Transmission Fluid Temperature Sensor "B" Performance

DESCRIPTION

The ATF (Automatic Transmission Fluid) temperature sensor converts the fluid temperature into a resistance value which is input to 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 ATF temperature is likely to increase under conditions such as towing, climbing hills and in traffic.





MONITOR DESCRIPTION

The ATF temperature sensor converts the ATF temperature to an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature and detects opens or shorts in the ATF temperature circuit or a fault in the ATF temperature sensor.

After running the vehicle for a certain period, the ATF temperature should increase. If the ATF temperature is below 20°C (68°F) after running the vehicle for a certain period, the ECM interprets this as a fault, and turns on the MIL.

When the ATF temperature is 110°C (230°F) or more and the engine coolant temperature reaches 60°C (140°F) after a cold start, the ECM also interprets this as a fault, turns on the MIL, and stores the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

ALL





Condition (A)





Condition (B)





Condition (C)





TYPICAL MALFUNCTION THRESHOLDS

Condition (A) and (B)





Condition (C)





COMPONENT OPERATING RANGE





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs DTC Check / Clear.

1. DATA LIST

HINT
According to the Data List displayed by Techstream, you can read the values of switches, sensors, actuators and so on without removing parts. Reading the Data List as the first step of troubleshooting is one method to save time.

NOTICE:
In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

(a) Warm up the engine.

(b) Turn the ignition switch off.

(c) Connect 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 / All Data.

(g) According to the display on the Techstream, read the Data List.

Engine and ECT





HINT
When DTC P2742 is output and Techstream reading is 150°C (302°F) or more, there is a short circuit.

When DTC P2743 is output and Techstream reading is -40°C (-40°F), there is an open circuit.

Check the temperature displayed on the tester in order to check if a malfunction exists.





HINT
It is not necessary to inspect the circuit when P2741 is set.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2741)

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs using Techstream.

Result





HINT
If any codes besides P2741 are output, perform troubleshooting for those DTCs first.

B -- GO TO DTC CHART Automatic Transmission System - A340E
A -- Continue to next step.

2. CHECK TRANSMISSION FLUID LEVEL

(a) Check the transmission fluid level A340E Automatic Transmission.

OK:

Automatic transmission fluid level is correct.

NG -- ADD FLUID

OK -- REPLACE TRANSMISSION WIRE (ATF TEMPERATURE SENSOR) Removal