Toyota Avalon (XX50): Malfunction in Motor (C1427). Motor Circuit (C1428). Steering Angle Sensor Power Source Voltage (C1432)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / Malfunction in Motor (C1427). Motor Circuit (C1428). Steering Angle Sensor Power Source Voltage (C1432)

Malfunction in Motor (C1427)

DESCRIPTION

When the power switch is on (READY), the stop light switch assembly off and the vehicle speed is 20 km/h (12 mph) or more, the skid control ECU (brake booster with master cylinder assembly) performs a self-diagnosis of the ABS motor relay circuit during the initial check of the actuator.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1427	Malfunction in Motor	1159	The pump motor built into the brake actuator assembly is not operating correctly.	Wire harness or connector Pump motor or pump motor circuit built into the brake actuator assembly	Comes on	INF Code 1159: SAE Code C1427 Electronically controlled brake system DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) monitors the voltage of the ABS motor. When the ABS motor is normal and the ABS motor relay is turned off, the voltage of the ABS motor drops gradually due to rotational inertia; however, if the ABS motor is not turning and the ABS motor relay is turned off, the voltage of the ABS motor drops immediately. If the voltage of the ABS motor drops considerably quickly when the ABS motor relay is turned off, the skid control ECU (brake booster with master cylinder assembly) judges that the ABS motor is not operating and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Related DTCs	C1427: ABS pump motor stuck
Required Sensors/Components(Main)	Brake actuator assembly
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly) Brake actuator assembly
Frequency of Operation	Continuous
Duration	2 times
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

Monitor runs whenever the following DTCs are not stored	None
Both of the following conditions are met	-
Skid control ECU (brake booster with master cylinder assembly) state	Initial check
After command to ABS motor relay on to off detection, 0.002 seconds passes	Met

TYPICAL MALFUNCTION THRESHOLDS

ABS pump motor voltage

Less than 1.3 V for 0.022 seconds or more within 0.024 seconds

COMPONENT OPERATING RANGE

All of the following conditions are met	-
Skid control ECU (brake booster with master cylinder assembly) state	Initial check
After command to ABS motor relay on to off detection, 0.002 seconds passes	Met
ABS pump motor voltage	Less than 1.3 V for less than 0.022 seconds within 0.024 seconds

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off.
Turn the power switch on (READY).
Turn the Techstream on.
Drive the vehicle at a speed of 20 km/h (12 mph) or more for 1 minute.
Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
If the DTCs are not output, perform a universal trip and check for permanent DTCs.
Click here

HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTCs are output, the system is normal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder assembly) or brake actuator assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".
Click here
Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	PERFORM ACTIVE TEST USING TECHSTREAM (ABS MOTOR RELAY)

(a) Select the Active Test on the Techstream.

Click here

Chassis > ABS/VSC/TRAC > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Motor Relay	ABS motor relay	Relay ON/OFF	Operating sound of motor can be heard.

Chassis > ABS/VSC/TRAC > Active Test

Tester Display
Motor Relay

(b) Check the operating sound of the ABS motor relay when operating it with the Techstream.

Result	Proceed to
The operating sound is heard.	A
The operating sound is not heard.	B

GO TO STEP 3

2.	RECONFIRM DTC

(a) Clear the DTCs.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(b) Turn the power switch off.

(d) Perform a road test.

(e) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1427 is not output.	A
DTC C1427 is output.	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

3.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

(a) Turn the power switch off.

(b) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(d) Disconnect the A39 brake actuator assembly connector.

(e) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A35-40 (+BM) - A39-10 (+BM)	Always	Below 1 Ω
A35-40 (+BM) or A39-10 (+BM) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-1 (MGND) - Body ground	Always	Below 1 Ω

*a	Front view of wire harness connector (to Brake Actuator Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

5.	RECONFIRM DTC

(a) Reconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.

(b) Reconnect the A39 brake actuator assembly connector.

Click here

Chassis > ABS/VSC/TRAC > Clear DTCs

(d) Turn the power switch off.

(e) Turn the power switch on (READY).

(f) Perform a road test.

(g) Check if the same DTC is output.

Click here

Chassis > ABS/VSC/TRAC > Trouble Codes

Result	Proceed to
DTC C1427 is not output.	A
DTC C1427 is output.	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE ACTUATOR ASSEMBLY

Motor Circuit (C1428)

DESCRIPTION

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1428	Motor Circuit	611 1160	INF Code: 611 An open or short in the ABS motor circuit is detected for 2 seconds or more. INF Code: 1160 The ABS motor voltage is 18.5 V or more for 0.2 seconds or more.	Brake actuator assembly	Comes on	INF Code 611: SAE Code C052B INF Code 1160: SAE Code C052D (Case 2) ABS DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1428

Motor Circuit

611

1160

INF Code: 611
- An open or short in the ABS motor circuit is detected for 2 seconds or more.
INF Code: 1160
- The ABS motor voltage is 18.5 V or more for 0.2 seconds or more.

Brake actuator assembly

Comes on

INF Code 611: SAE Code C052B
INF Code 1160: SAE Code C052D (Case 2)
ABS DTC

MONITOR DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) monitors the voltage of the ABS motor. When the ABS motor relay is instructed to be off and the voltage of the ABS motor is at a value that is not possible when normal, the skid control ECU (brake booster with master cylinder assembly) judges that the circuit of the ABS motor is malfunctioning and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C052B: ABS pump motor range/performance C052D (Case 2): ABS pump motor circuit high
Required Sensors/Components(Main)	Brake actuator assembly
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	0.2 seconds: C052D (Case 2) 2 seconds: C052B
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

C052B

Command to ABS motor relay

Off

TYPICAL MALFUNCTION THRESHOLDS

C052B

ABS pump motor voltage

Higher than 1.448 V, and less than 7.607 V

C052D (Case 2)

ABS pump motor voltage

18.57 V or more

COMPONENT OPERATING RANGE

C052B

Both of the following conditions are met	-
Command to ABS motor relay	Off
ABS pump motor voltage	1.448 V or less, or 7.607 V or more

C052D (Case 2)

ABS pump motor voltage

Less than 18.57 V

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the power switch off.
Turn the power switch on (IG).
Turn the Techstream on.
Wait 2 seconds.
Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
Read the DTCs.
HINT:
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
If the judgment result is INCOMPLETE or N/A and no pending DTCs are output, perform a universal trip and check for permanent DTCs.
Click here

HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTCs are output, the system is normal.

WIRING DIAGRAM

Refer to DTC C1427.

Click here

CAUTION / NOTICE / HINT

NOTICE:

After replacing the brake actuator assembly, perform linear solenoid valve offset learning, ABS holding solenoid valve learning, yaw rate and acceleration sensor zero point calibration and system information memorization after performing "Reset Memory".

Click here

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.

OK:

The connector is securely connected.

(b) Disconnect the A35 skid control ECU (brake booster with master cylinder assembly) connector.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A35-40 (+BM) - A39-10 (+BM)	Always	Below 1 Ω
A35-40 (+BM) or A39-10 (+BM) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
A39-1 (MGND) - Body ground	Always	Below 1 Ω

*a	Front view of wire harness connector (to Brake Actuator Assembly)

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

Steering Angle Sensor Power Source Voltage (C1432)

DESCRIPTION

The skid control ECU (brake booster with master cylinder assembly) outputs this DTC when it receives a sensor power source malfunction signal from the steering angle sensor.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1432	Steering Angle Sensor Power Source Voltage	703	Steering angle sensor power supply malfunction signal is received from steering angle sensor.	Wire harness or connector Steering angle sensor	Does not come on	VSC DTC

WIRING DIAGRAM

Refer to DTC C1434.

Click here

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Remove the steering wheel and column cover.

*a	Front view of wire harness connector (to Steering Angle Sensor)

(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

OK:

The connector is securely connected.

(d) Check both the connector case and the terminals for deformation and corrosion.

OK:

No deformation or corrosion.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
G48-4 (BAT) - Body ground	Always	11 to 14 V
G48-9 (IG) - Body ground	Power switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

2.	CHECK HARNESS AND CONNECTOR (GND TERMINAL)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Steering Angle Sensor)

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

NOTICE:

Before measuring the resistance of the steering angle sensor, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or switches, or opening or closing the doors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G48-6 (ESS) - Body ground	1 minute after power switch off	Below 1 Ω

REPLACE STEERING ANGLE SENSOR

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)

Open in Stop Switch Circuit (C1425,P0573)

Steering Angle Sensor Internal Circuit (C1433). Steering Angle Sensor Output (C1434). Malfunction in Yaw Rate Sensor (C1436)

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