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.	○	-
Diagnostic Condition	Deceleration Sensor Zero Point Calibration is performed.	-	○
Malfunction Condition	Deceleration Sensor Zero Point Calibration has not been completed.	○	-
Malfunction Condition	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.

Drive the vehicle 2 km/h (1 mph) or more.
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

(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

GO TO STEP 3

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.

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

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.

SECURELY INSTALL AIRBAG SENSOR ASSEMBLY

4.	READ VALUE USING TECHSTREAM (G SENSOR)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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	-

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

GO TO STEP 6

5.	REPLACE ECM

(a) Replace the ECM.

Click here

PERFORM INITIALIZATION

6.	REPLACE AIRBAG SENSOR ASSEMBLY

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

Click here

PERFORM INITIALIZATION

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