Dtc P Transmission Fluid Temperature Sensor B Circuit Dtc P Transmission Fluid Temperature Sensor B Circuit Low Input Dtc P Transmission Fluid Temperature Sensor B Circuit High Input

description

The No. 2 ATF temperature sensor is on the transmission, just in front of the oil cooler inlet pipeline. If the ECM detects an abnormally high ATF temperature near this sensor, it illuminates the warning light.

HINT:

• ATF temperature rises quickly when towing, climbing hills, in traffic, etc.

• If the No. 2 ATF temperature sensor becomes short-circuited, the signal that indicates that the ATF temperature is 150°C (302°F) or higher is input to the ECM.

Vehicle conditions when the sensor is normal and when the sensor is short-circuited are indicated in the table below.

DETECTION CONDITION

No. 2 ATF Temperature Sensor State

Detection Condition

Symptom

Recovery Condition

Sensor is normal

ATF temperature more than 150°C (275°F)

A/T OIL TEMP warning light remains ON

ATF temperature less than 135° C(275°F)*2

ATF temperature more than 130°C (266°F)

Shift point too high

ATF temperature less than 110° C (230°F)

When the conditions (a) and (b) are satisfied.

a. ATF temperature more than 130°C (266°F)

b. Engine coolant temperature more than 95°C (203°F)

Lock-up at 3rd gear*1

ATF temperature less than 110° C (230°F)*2 and engine coolant temperature more than 95°C (203°F)

Sensor is short-circuited

Any conditions

• A/T OIL TEMP warning light remains ON

• Shift point too high

Symptoms still occur

Engine coolant temperature more than 95°C (203°F)

Lock-up at 3rd gear*1

Symptoms still occur

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

HINT:

*1: When ATF temperature is normal, transmission lock-up occurs in 5th gear with the shift lever in the D position, and 4th gear with the shift lever in the 4 position.

*2: When ATF temperature is in the normal range, it decreases to less than 135°C (275°F) within 5 minutes with the shift lever in the P or N position in an idling state.

DTC DETECTION CONDITION

DTC No.

DTC Detection Condition

Trouble Area

P2740

(a) and (b) are detected momentarily within 0.5 seconds when neither P2742 or P2743 are detected. (1 trip detection logic)

(a) No. 2 ATF temperature sensor resistance is less than 25 ohms.

(b) No. 2 ATF temperature sensor resistance is more than 156 kohms.

HINT:

Within 0.5 seconds, the malfunction switches from (a) to (b) or from (b) to (a).

• Open or short in No. 2 ATF temperature sensor circuit

• No. 2 ATF temperature sensor

• ECM

P2742

No. 2 ATF temperature sensor resistance is less than 25 ohms for 0.5 seconds or more. (1 trip detection logic)

• Short in No. 2 ATF temperature sensor circuit

• No. 2 ATF temperature sensor

• ECM

P2743

No. 2 ATF temperature sensor resistance is more than 156 kohms when 15 minutes or more have passed after the engine start.

DTC is detected for 0.5 seconds or more. (1 trip detection logic)

• Open in No. 2 ATF temperature sensor circuit

• No. 2 ATF temperature sensor

• ECM

monitor description

ATF temperature sensor converts ATF temperature into an electrical resistance value. Based on the resistance, the ECM determines the ATF temperature, and the ECM detects an open or short in the ATF temperature circuit. If the resistance value of the ATF temperature is less than 25 ohms*1 or more than 156 kohms*2, the ECM interprets this as a fault in the ATF sensor or wiring. The ECM will illuminate the MIL and store the DTC.

• *1: 150°C (302°F) or more is indicated regardless of the actual ATF temperature.

• *2: -40°C (-40°F) is indicated regardless of the actual ATF temperature.

2006 TRANSMISSION A750E Automatic Transaxle - Sequoia

• The ATF temperature can be checked on the intelligent tester display. monitor strategy

MONITOR STRATEGY

Related DTCs

P2740: ATF temperature sensor/Range check (Fluttering) P2742: ATF temperature sensor/Range check (Low resistance) P2743: ATF temperature sensor/Range check (High resistance)

Required sensors/Components

ATF temperature sensor

Frequency of operation

Continuous

Duration

0.5 seconds

MIL operation

Immediate

Sequence of operation

None

typical enabling conditions TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present

None

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