Toyota CH-R Service Manual: Acceleration Sensor Malfunction (P1586)

DESCRIPTION

The ECM determines the vehicle inclination based on a signal from the airbag sensor assembly (yaw rate and acceleration sensor). If a malfunction of 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.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P1586	Acceleration Sensor Malfunction	After the ignition switch is turned ON, the skid control ECU (brake actuator assembly) has detected either 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). While the vehicle is driven at 30 km/h (19 mph) or more, the difference between the calculated longitudinal G value based on the airbag sensor assembly (yaw rate and acceleration sensor) (G sensor) and the value based the vehicle speed exceeds 0.35 G for 60 seconds or more. Airbag sensor assembly (yaw rate and acceleration sensor) signal does not change 16 times or more while the vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph).	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
Diagnostic Condition	The ignition switch is ON.	○	○
Malfunction Condition	At a vehicle speed 30 km/h (19 mph) or more, the difference between longitudinal G calculated based on the airbag sensor assembly (yaw rate and acceleration sensor) (G sensor) value and longitudinal G calculated based on the vehicle speed exceeds 0.35 G for 60 seconds or more.	○	-
	The airbag sensor assembly (yaw rate and acceleration sensor) signal does not change 16 times or more while the vehicle speed decreases from 30 km/h (19 mph) to 0 km/h (0 mph).	-	○
Duration		3 seconds or more	3 seconds or more
Detection Logic		1 trip detection logic	1 trip detection logic

HINT:

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

WIRING DIAGRAM

Refer to DTC P1585

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CAUTION / NOTICE / HINT

HINT:

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

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.	CHECK DTC OUTPUT (IN ADDITION TO DTC P1586)

(a) Connect the Techstream to the DLC3.

(b) Turn the Techstream on.

(c) Turn the ignition switch to ON.

(d) Clear the DTCs.

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Powertrain > Engine and ECT > Clear DTCs

(e) Perform a road test where the vehicle is driven at 30 km/h (18 mph) or more, the brakes are applied at least 16 times and the vehicle is finally stopped.

(f) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Powertrain > Engine and ECT > Trouble Codes

(g) Read the DTCs using the Techstream.

HINT:

If any DTCs other than P1586 are output, perform troubleshooting for those DTCs first.

Result	Proceed to
Only DTC P1586 is output	A
DTC P1586 and other DTCs are output	B

B

GO TO DTC CHART

A

3.	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: G 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

4.	REPLACE AIRBAG SENSOR ASSEMBLY

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

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PERFORM INITIALIZATION