Toyota CH-R Service Manual: Acceleration Sensor Circuit (P1585)

DESCRIPTION

The ECM determines the vehicle inclination based on a signal from the airbag sensor assembly (yaw rate and acceleration sensor). If a malfunction in the airbag sensor assembly (yaw rate and acceleration sensor) is determined based on a malfunction signal from the skid control ECU (brake actuator assembly), the ECM stores this DTC.

HINT:

  • The airbag sensor assembly (yaw rate and acceleration sensor) signal is sent to the skid control ECU (brake actuator assembly) via CAN communication.
  • If CAN communication DTCs are output, perform troubleshooting for those DTCs first.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P1585

Acceleration Sensor Circuit

After the ignition switch is turned ON, the skid control ECU (brake actuator assembly) has detected one of the following conditions, and the ECM has received a diagnostic signal from the skid control ECU (brake actuator assembly) for 3 seconds or more (1 trip detection logic).

  • Output value of the airbag sensor assembly (yaw rate and acceleration sensor) remains at -1.5 G or less, or 1.5 G or more for at least 1.2 seconds.
  • Airbag sensor assembly (yaw rate and acceleration sensor) power source voltage is 4.4 V or less, or 5.6 V or higher, for at least 1.2 seconds or more.
  • No signal is detected from the airbag sensor assembly (yaw rate and acceleration sensor) 7 times or more.
  • With the vehicle stopped, the difference between GL1 and GL2 does not become less than 0.4 G within 60 seconds after exceeding 0.6 G.
  • An airbag sensor assembly (yaw rate and acceleration sensor) power source voltage malfunction signal is received for at least 10 seconds with the vehicle speed at 3 km/h (1.8 mph) or more.
  • Airbag sensor assembly (Yaw rate and acceleration sensor)
  • Brake actuator assembly (Skid control ECU)
  • CAN communication system

Does not come on

DTC stored

DTC Detection Condition Patterns:
 

Vehicle Condition

Pattern 1

Pattern 2

Pattern 3

Pattern 4

Pattern 5

Diagnostic Condition

The ignition switch is ON.

Malfunction Condition

The output value of the airbag sensor assembly (yaw rate and acceleration sensor) remains at -1.5 G or less, or 1.5 G or more for at least 1.2 seconds or more.

-

-

-

-

The airbag sensor assembly (yaw rate and acceleration sensor) power source voltage is at 4.4 V or less, or 5.6 V or higher for 1.2 seconds or more.

-

-

-

-

No signal from the airbag sensor assembly (yaw rate and acceleration sensor) is detected 7 times or more.

-

-

-

-

With the vehicle stopped, the difference between GL1 and GL2 does not become less than 0.4 G within 60 seconds after exceeding 0.6 G.

-

-

-

-

An airbag sensor assembly (yaw rate and acceleration sensor) power source voltage malfunction signal is received for at least 10 seconds with the vehicle speed at 3 km/h (1.8 mph) or more.

-

-

-

-

Duration

3 seconds or more

3 seconds or more

3 seconds or more

3 seconds or more

3 seconds or more

Detection Logic

1 trip detection logic

1 trip detection logic

1 trip detection logic

1 trip detection logic

1 trip detection logic

HINT:

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

WIRING DIAGRAM

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. Turn the ignition switch to ON and wait for 60 seconds or more.
  2. Perform the D Position Shift Test inspection in Road Test.

    Click here

  3. Check for DTCs again.

    Click here

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Check for DTCs.

Powertrain > Engine and ECT > Trouble Codes

Result

Proceed to

DTC U0129 is not output

A

DTC U0129 is output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

2.

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 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: Yaw rate and acceleration sensor malfunction
  • Set to 1.87 V: Communication malfunction

-

Result

Proceed to

Data display is not within Normal Condition range

A

Data display is within Normal Condition range

B

B

REPLACE BRAKE ACTUATOR ASSEMBLY

A

3.

REPLACE AIRBAG SENSOR ASSEMBLY

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

Click here

NEXT

PERFORM INITIALIZATION

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