Toyota CH-R Service Manual: Acceleration Sensor Learning Value (P1589)

Toyota CH-R Service Manual / K114 Cvt / Continuously Variable Transaxle System / Acceleration Sensor Learning Value (P1589)

DESCRIPTION

The ECM stores DTC P1589 if deceleration sensor zero point calibration is not performed or failed after system components such as the ECM are replaced.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1589

Acceleration Sensor Learning Value

Either one of the following conditions is met (1 trip detection logic):

  • When the vehicle speed is 2 km/h (1.2 mph) or more, Deceleration Sensor Zero Point Calibration has not been completed.
  • While Deceleration Sensor Zero Point Calibration is performed, the learned values of Deceleration Sensor Zero Point Calibration are abnormal (out of normal range).
  • Deceleration Sensor Zero Point Calibration has not been performed.
  • Vehicle was not stable during Deceleration Sensor Zero Point Calibration.
  • Airbag sensor assembly (Yaw rate and acceleration sensor)
  • ECM

Does not come on

DTC stored
DTC Detection Condition Patterns:
 

Vehicle Condition

Pattern 1

Pattern 2

Diagnostic Condition

The vehicle speed is 2 km/h (1.2 mph) or more.

○

-

Deceleration Sensor Zero Point Calibration is performed.

-

○

Malfunction Condition

Deceleration Sensor Zero Point Calibration has not been completed.

○

-

The learned values of Deceleration Sensor Zero Point Calibration are abnormal (out of normal range).

-

○

Duration

-

-

Detection Logic

1 trip detection logic

1 trip detection logic

HINT:

This DTC is output when either of the above detection patterns is met.

CAUTION / NOTICE / HINT

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

HINT:

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

  1. Drive the vehicle 2 km/h (1 mph) or more.
  2. Check for DTCs again.

    Click here

PROCEDURE

1.

PERFORM INITIALIZATION (DECELERATION SENSOR ZERO POINT CALIBRATION)

NOTICE:

  • If CVT oil pressure calibration is performed before deceleration sensor zero point calibration, DTC P1589 is stored. In this case, perform steps *1, *2, *3, *4 and *5 to return the system to normal.
  • Always perform calibration with the vehicle on level ground (Inclination: 0 +/- 0.25°).
  • Do not shake or vibrate the vehicle during calibration.

(a) Turn the ignition switch off.*1

(b) Move the shift lever to P and apply the parking brake.*2

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.*3

NOTICE:

Do not start the engine.

(e) Enter the following menus: Powertrain / Engine and ECT / Utility / Reset Memory.*4

Powertrain > Engine and ECT > Utility

Tester Display

Reset Memory

(f) Enter the following menus: Powertrain / ECT / Utility / Deceleration Sensor Zero Point Calibration.*5

Powertrain > Engine and ECT > Utility

Tester Display

Deceleration Sensor Zero Point Calibration

HINT:

  • When "Complete" is displayed on the screen, deceleration sensor zero point calibration is complete.
  • If "Error" is displayed on the screen, the deceleration sensor circuit may be malfunctioning.
  • Shaking or vibrating the vehicle during deceleration sensor zero point calibration may cancel calibration. If "Error" is displayed on the screen, perform step *5 again.

(g) If "Error" is displayed on the Techstream, read the DTCs using the Techstream.

Result

Proceed to

Deceleration sensor zero point calibration is completed normally

A

DTC P1589 is output

B
B

GO TO STEP 3

A

2.

PERFORM CVT OIL PRESSURE CALIBRATION

NOTICE:

Do not clear the learned values by performing Reset Memory.

(a) Turn the ignition switch off and wait at least 30 seconds.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON and wait at least 2 seconds.

NOTICE:

Do not start the engine.

HINT:

CVT oil pressure calibration is performed with the ignition switch ON (engine stopped). However, calibration cannot be performed under the following conditions:

  • Oil pressure sensor value is 0.065 MPa (0.663 kgf/cm2, 9.43 psi) or higher.
  • CVT oil temperature is -5°C (23°F) or less or 120°C (248°F) or higher.

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

(e) Start the engine and wait at least 5 seconds.

NOTICE:

  • Start the engine with the shift lever in P.
  • After starting the engine, do not operate the accelerator pedal.

(f) Enter the following menus: Powertrain / Engine and ECT / Utility / CVT Oil Pressure Calibration.

HINT:

  • During CVT oil pressure calibration, the engine idle speed will increase.
  • When "Complete" is displayed on the screen, CVT oil pressure calibration is complete.
  • The learned values cannot be cleared by only disconnecting and reconnecting the cable to the negative (-) battery terminal.
Powertrain > Engine and ECT > Utility

Tester Display

CVT Oil Pressure Calibration

(g) Check for DTCs again.

Powertrain > Engine and ECT > Trouble Codes
NEXT

END

3.

CHECK AIRBAG SENSOR ASSEMBLY

(a) Check the airbag sensor assembly (yaw rate and acceleration sensor) for any inclination, bracket deformation or installation clearance.

OK:

The airbag sensor assembly (yaw rate and acceleration sensor) is installed correctly.

NG

SECURELY INSTALL AIRBAG SENSOR ASSEMBLY

OK

4.

READ VALUE USING TECHSTREAM (G SENSOR)

(a) Connect the 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 / Data List.

Powertrain > Engine and ECT > Data List

Tester Display

G Sensor

(e) 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

G Sensor

Converted output voltage of yaw rate and acceleration sensor

Min.: 0.000 V

Max.: 79.998 V

Displays converted voltage of yaw rate and acceleration sensor

  • 2.31 V to 2.69 V: Vehicle on level ground
  • 1.88 V to 2.5 V: Decelerating
  • 2.5 V to 3.11 V: Accelerating
  • Set to 1.87 V: G sensor malfunction
  • Set to 1.87 V: Communication malfunction

-

Result

Proceed to

Data display is within Normal Condition range

A

Data display is not within Normal Condition range

B
B

GO TO STEP 6

A

5.

REPLACE ECM

(a) Replace the ECM.

Click here

NEXT

PERFORM INITIALIZATION

6.

REPLACE AIRBAG SENSOR ASSEMBLY

(a) Replace the airbag sensor assembly (yaw rate and acceleration sensor).

Click here

NEXT

PERFORM INITIALIZATION

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