Toyota CH-R Service Manual: Transmission Fluid Pressure Sensor/Switch "A" Circuit Low (P0842,P0843)

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / Transmission Fluid Pressure Sensor/Switch "A" Circuit Low (P0842,P0843)

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0842

Transmission Fluid Pressure Sensor/Switch "A" Circuit Low

When 2 seconds or more have elapsed after engine start, there is a short in the oil pressure sensor circuit for 0.5 seconds (1 trip detection logic).

  • Wire harness or connector
  • Oil pressure sensor
  • ECM

Comes on

DTC stored

P0843

Transmission Fluid Pressure Sensor/Switch "A" Circuit High

When 2 seconds or more have elapsed after engine start, there is an open or a short to +B in the oil pressure sensor circuit for 0.5 seconds (1 trip detection logic).

  • Wire harness or connector
  • Oil pressure sensor
  • ECM

Comes on

DTC stored

MONITOR DESCRIPTION

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

MONITOR STRATEGY

Related DTCs

P0842: Oil pressure sensor / Range check (Low voltage)

P0843: Oil pressure sensor / Range check (High voltage)

Required sensors/Components

Oil pressure sensor

Frequency of operation

Continuous

Duration Conditions

0.5 seconds

MIL operation

Immediately

Sequence of operation

None

TYPICAL ENABLING CONDITIONS

All

Starter

OFF

Time after Starter ON to OFF

2 seconds or more

Battery voltage

8 V or more

Time after Battery voltage 8 V or more

0.5 seconds or more

Write Inhibit

permit

Time after Write status forbiddance to permit

0.5 seconds or more

Ignition switch

ON

Time after Ignition switch OFF to ON

0.5 seconds or more

Time after Starter ON to OFF

0.5 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

P0842:

Oil pressure sensor output voltage

Less than 0.28 V

P0843:

Oil pressure sensor output voltage

More than 4.9 V

COMPONENT OPERATING RANGE

Oil pressure sensor output voltage

0.28 to 4.9 V

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform a stall test if any wheel chocks are out of position.
  • The vehicle could begin moving suddenly, resulting in a serious accident.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.
  • The vehicle could begin moving suddenly, resulting in a serious accident.

NOTICE:

  • Perform initialization after replacing any parts related to the continuously variable transaxle system.

    Click here

  • Check that no DTCs are stored after performing initialization.

    Click here

  • Perform the universal trip to clear permanent DTCs.

    Click here

HINT:

After performing repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

  1. Start the engine and wait for 2 seconds or more.
  2. Check for DTCs again.

    Click here

PROCEDURE

1.

READ VALUE USING TECHSTREAM (A/T OIL PRESSURE)

CAUTION:

  • Do not perform a stall test if there are any people or objects near the vehicle.
  • Do not perform a stall test if any wheel chocks are out of position.
  • Do not perform the stall test on a slippery or low-friction surface that could allow the tires to spin.

NOTICE:

  • This test must be conducted after checking and confirming that the engine is operating normally.
  • Perform this test while the CVT fluid temperature is between 50 and 100°C (122 and 212°F).
  • Perform this test with the A/C off.
  • Do not perform the stall speed test for longer than 5 seconds.
  • Perform this test with the AUTO function (shift-linked function) of the electronic parking brake system off.

(a) Warm up the engine.

(b) Fully apply the parking brake and chock all 4 wheels.

HINT:

When the electric parking brake switch assembly is pulled to the lock side 2 times (2 lock operations), the maximum amount of braking force is applied.

(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 / Active Test / Connect the TC and TE1.

Powertrain > Engine and ECT > Active Test

Tester Display

Connect the TC and TE1

(g) Enter the following menus: Powertrain / Engine and ECT / Data List / Primary.

Powertrain > Engine and ECT > Data List

Tester Display

A/T Oil Pressure

(h) In accordance with the display on the Techstream, read the Data List.

Powertrain > Engine and ECT > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

A/T Oil Pressure

Secondary oil pressure value

Min.: -64 MPa

Max.: 63.998 MPa

Secondary oil pressure inspection:

  • 3.9 to 4.7 MPa (39.8 to 47.9 kgf/cm2, 566 to 682 psi): D position stall speed test
  • 3.7 to 4.9 MPa (37.7 to 50.0 kgf/cm2, 537 to 711 psi): R position stall speed test

-

Result

Proceed to

Data display is not within Normal Condition range

A

Data display is within Normal Condition range

B

B

GO TO STEP 6

A

2.

CHECK HARNESS AND CONNECTOR (OIL PRESSURE SENSOR - ECM)

(a) Disconnect the C44 oil pressure sensor connector.

(b) Disconnect the C63 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C44-1 (E2) - C63-109 (EPTO)

Always

Below 1 Ω

C44-2 (PTO) - C63-79 (PTO)

Always

Below 1 Ω

C44-3 (VC) - C63-110 (VCPT)

Always

Below 1 Ω

C44-1 (E2) or C63-109 (EPTO) - Body ground and other terminals

Always

10 kΩ or higher

C44-2 (PTO) or C63-79 (PTO) - Body ground and other terminals

Always

10 kΩ or higher

C44-3 (VC) or C63-110 (VCPT) - Body ground and other terminals

Always

10 kΩ or higher

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

C63-79 (PTO) - Body ground

Ignition switch ON

Below 1 V

C44-2 (PTO) - Body ground

Ignition switch ON

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (OIL PRESSURE SENSOR - ECM)

OK

3.

CHECK ECM (VCPT TERMINAL VOLTAGE)

(a) Disconnect the oil pressure sensor connector.

*a

Front view of wire harness connector

(to Oil Pressure Sensor)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

C44-3 (VC) - C44-1 (E2)

Ignition switch ON

4.75 to 5.25 V

NG

GO TO STEP 5

OK

4.

REPLACE OIL PRESSURE SENSOR

(a) Replace the oil pressure sensor.

Click here

NEXT

PERFORM INITIALIZATION

5.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

6.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

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