K111F Cvt. Dtc P0840 Transmission Fluid Pressure Sensor/Switch A Circuit

The ECM performs learning control for the belt clamping pressure based on the belt clamping pressure signal, which is detected by the oil pressure sensor.

DTC Code	DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other	Trouble Area
P0840	2 seconds or more have elapsed after the engine is started. There is an open or short circuit in the oil pressure sensor circuit. 0.5 seconds 1 trip detection logic	Open or short in oil pressure sensor circuit Oil pressure sensor ECM
P0842	2 seconds or more have elapsed after the engine is started. There is a short circuit in the oil pressure sensor circuit. 0.5 seconds 1 trip detection logic	Short in oil pressure sensor circuit Oil pressure sensor ECM
P0843	2 seconds or more have elapsed after the engine is started. There is an open circuit in the oil pressure sensor circuit. 0.5 seconds 1 trip detection logic	Open in oil pressure sensor circuit Oil pressure sensor ECM

MONITOR DESCRIPTION

These DTCs indicate an open or short circuit in the oil pressure sensor circuit. When there is an open or short circuit in the oil pressure sensor circuit, the ECM detects the problem, illuminates the MIL and stores the DTC.

WIRING DIAGRAM

Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.K111F Cvt.Continuously Variable Transaxle System.
Dtc
P0840 Transmission Fluid Pressure Sensor/Switch A Circuit

INSPECTION PROCEDURE

1.READ VALUE USING INTELLIGENT TESTER (A/T OIL PRESSURE)

Connect the intelligent tester to the DLC3.

Turn the ignition switch to ON.

Turn the intelligent tester on.

Enter the following menus: Powertrain / Engine and ECT / Data List.

In accordance with the display on the tester, read the Data List.

Engine and ECT
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
A/T Oil Pressure	Secondary oil pressure value/ min.: -0.625 MPa max.: 9.575 MPa	Secondary oil pressure inspection D position stall speed test: 3.39 to 4.60 MPa R position stall speed test: 2.76 to 3.80 MPa	-

Result
Result	Proceed to
Data displayed is not as specified under Normal Condition	A
Data displayed is as specified under Normal Condition	B

Go to step 6

A

2.CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM)

Disconnect the oil pressure sensor connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
B120-1 (E2) - B32-72 (EPTO)	Always	Below 1 Ω
B120-2 (PTO) - B32-73 (PTO)	Always	Below 1 Ω
B120-3 (VC) - B32-95 (VCPT)	Always	Below 1 Ω
B120-1 (E2) or B32-72 (EPTO) - Body ground	Always	10 kΩ or higher
B120-2 (PTO) or B32-73 (PTO) - Body ground	Always	10 kΩ or higher
B120-3 (VC) or B32-95 (VCPT) - Body ground	Always	10 kΩ or higher

Text in Illustration
*1	Front view of wire harness connector (to Oil Pressure Sensor)
*2	Front view of wire harness connector (to ECM)

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.INSPECT ECM (VCPT TERMINAL VOLTAGE)

Disconnect the oil pressure sensor connector.

Turn the ignition switch to ON.

Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
B120-1 (E2) - B120-3 (VC)
Ignition switch ON
4.75 to 5.25 V
Text in Illustration
*1
Front view of wire harness connector
(to Oil Pressure Sensor)

Go to step 8

OK

4.REPLACE OIL PRESSURE SENSOR

Replace the oil pressure sensor (RAV4_ACA30 RM0000020TV00QX.html).

NEXT

5.PERFORM INITIALIZATION

NOTICE:

Performing reset memory will clear the learned values of both the yaw rate sensor assembly*1 or deceleration sensor*2 (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor assembly*1 or deceleration sensor*2 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:
Replaced Part
Continuously variable transaxle assembly
ECM
Oil pressure sensor
Yaw rate sensor assembly (w/ VSC)
Deceleration sensor (w/o VSC)
Brake actuator assembly (skid control ECU)
After performing reset memory, always perform yaw rate sensor assembly*1 or deceleration sensor*2 (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.
Always perform 0 point calibration with the vehicle on level ground.
Do not shake or vibrate the vehicle during 0 point calibration.

Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration (RAV4_ACA30 RM000003UQR002X.html).

Check that no DTC is stored.

END

6.REPLACE ECM

Replace the ECM (RAV4_ACA30 RM0000017UO01KX.html).

NEXT

7.PERFORM INITIALIZATION

NOTICE:

Performing reset memory will clear the learned values of both the yaw rate sensor assembly*1 or deceleration sensor*2 (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor assembly*1 or deceleration sensor*2 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:
Replaced Part
Continuously variable transaxle assembly
ECM
Oil pressure sensor
Yaw rate sensor assembly (w/ VSC)
Deceleration sensor (w/o VSC)
Brake actuator assembly (skid control ECU)
After performing reset memory, always perform yaw rate sensor assembly*1 or deceleration sensor*2 (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.
Always perform 0 point calibration with the vehicle on level ground.
Do not shake or vibrate the vehicle during 0 point calibration.

Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration (RAV4_ACA30 RM000003UQR002X.html).

Check that no DTC is stored.

END

8.REPLACE ECM

Replace the ECM (RAV4_ACA30 RM0000017UO01KX.html).

NEXT

9.PERFORM INITIALIZATION

NOTICE:

Performing reset memory will clear the learned values of both the yaw rate sensor assembly*1 or deceleration sensor*2 (deceleration sensor 0 point calibration) and CVT oil pressure (CVT oil pressure calibration). Make sure to perform reset memory, yaw rate sensor assembly*1 or deceleration sensor*2 0 point calibration and CVT oil pressure calibration when replacing any of the parts shown in the following table:
Replaced Part
Continuously variable transaxle assembly
ECM
Oil pressure sensor
Yaw rate sensor assembly (w/ VSC)
Deceleration sensor (w/o VSC)
Brake actuator assembly (skid control ECU)
After performing reset memory, always perform yaw rate sensor assembly*1 or deceleration sensor*2 (deceleration sensor 0 point) calibration first, and then CVT oil pressure calibration.
Always perform 0 point calibration with the vehicle on level ground.
Do not shake or vibrate the vehicle during 0 point calibration.

Using the intelligent tester, perform reset memory, deceleration sensor 0 point calibration and CVT oil pressure calibration (RAV4_ACA30 RM000003UQR002X.html).

Check that no DTC is stored.

END

Tester Connection	Switch Condition	Specified Condition
B120-1 (E2) - B120-3 (VC)	Ignition switch ON	4.75 to 5.25 V