Code No.P2743: A/T Fluid Temperature Sensor 2 System (Open Circuit)

OPERATION

The A/T fluid temperature sensor 2 converts the A/T fluid temperature to voltage, and send the information to the A/T-ECU.
The A/T fluid temperature rises, the resistance decreases. Thus, the sensor output voltage depends on the A/T fluid temperature. As the A/T fluid temperature rises, the output voltage will decrease.

DIAGNOSIS CODE SET CONDITION

10 minutes after the start of driving, when a status continues for 12 seconds with which the input voltage from fluid temperature sensor 2 is higher than standard value, code No. P2743 is set.

PROBABLE CAUSES

Malfunction of the A/T fluid temperature sensor 2
Damaged harness wires and connectors
Malfunction of the A/T-ECU

DIAGNOSIS PROCEDURE

STEP 1. Measure the resistance at A/T-ECU connector.

Disconnect the connector, and measure the resistance between terminal OTS2 line and terminal GSE2 line at the sensor side.

OK:

Approx. 6.5 kΩ (at 10°C)

Approx. 3.5 kΩ (at 25°C)

Approx. 0.25 kΩ (at 110°C)

Q. Is the check result normal?

	Go to Step 4.

	Go to Step 2.

STEP 2. Check the A/T fluid temperature sensor.

Refer to

Q. Is the check result normal?

	Go to Step 3.

	Replace the A/T fluid temperature sensor 2.

STEP 3. Check for open circuit and short circuit in OTS2, GSE2 line between A/T fluid temperature sensor 2 connector and A/T-ECU connector.

Q. Is the check result normal?

	Go to Step 4.

	Repair the connector(s) or wiring harness.

STEP 4. Check whether the diagnosis code is set again.

Ignition switch: "LOCK"(OFF) → "ON"
Check again if the diagnosis code is set.

Q. Is diagnosis code No.P2743 set?

	Replace the A/T-ECU.

	Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).