Toyota Avalon (XX50): IG1 Voltage Supply too High (C1417,C14DF). Deceleration Sensor Internal Circuit (C1419,C1435). Malfunction in Deceleration Sensor (C1420)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Brake / Brake Control / Dynamic Control Systems / Electronically Controlled Brake System(for Hv Model) / IG1 Voltage Supply too High (C1417,C14DF). Deceleration Sensor Internal Circuit (C1419,C1435). Malfunction in Deceleration Sensor (C1420)

IG1 Voltage Supply too High (C1417,C14DF)

DESCRIPTION

If a malfunction is detected in the power source circuit, the skid control ECU (brake booster with master cylinder assembly) stores DTC C1417 and prohibits operation of ABS, brake assist, regenerative brake cooperative control, etc.

DTC C1417 is stored if an excessive ECU voltage due to a malfunction in the auxiliary battery, charging circuit, etc. is detected, and is cleared when the ECU voltage returns to normal.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1417	IG1 Voltage Supply too High	553	The internal voltage of the skid control ECU (brake booster with master cylinder assembly) is 16.44 V or more for 0.8 seconds or more.	Auxiliary battery Hybrid control system (Charging circuit) Wire harness or connector Improperly connected connector, deformation or corrosion of terminals Skid control ECU (brake booster with master cylinder assembly)	Comes on	SAE Code C1417 Electronically controlled brake system DTC
C14DF	Brake Pressure Control Solenoid Supply Voltage Circuit High	-	The power source voltage of the linear solenoid is 16 V or more for 0.8 seconds or more.	Auxiliary battery Hybrid control system (Charging circuit) Improperly connected connector, deformation or corrosion of terminals Skid control ECU (brake booster with master cylinder assembly)	Comes on	-

MONITOR DESCRIPTION

When the vehicle is being driven, if the voltage at VM1, IG1 or BS is a specific value or more due to a malfunction in the auxiliary battery and hybrid control system (charging circuit), the skid control ECU (brake booster with master cylinder assembly) judges that there is an increase in the power supply voltage of VM1, IG1 or BS and illuminates the MIL and stores a DTC.

MONITOR STRATEGY

Related DTCs	C1417 (Case 1): Brake system voltage circuit high C1417 (Case 2): Brake system voltage circuit high C14DF: Main relay voltage circuit high
Required Sensors/Components(Main)	Skid control ECU (brake booster with master cylinder assembly)
Required Sensors/Components(Related)	Speed sensor
Frequency of Operation	Continuous
Duration	0.8 seconds
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

All

Monitor runs whenever the following DTCs are not stored

None

C1417 (Case 1)

Vehicle speed

Higher than 3 km/h (2 mph)

TYPICAL MALFUNCTION THRESHOLDS

C1417 (Case 1)

IG1 voltage

17.4 V or more

C1417 (Case 2)

Brake system voltage 1 (VM1)

16.44 V or more

C14DF

Power supply for linear solenoid

16 V or more

COMPONENT OPERATING RANGE

C1417 (Case 1)

Both of the following conditions are met	-
Vehicle speed	Higher than 3 km/h (2 mph)
IG1 voltage	Less than 17.4 V, and 3.5 V or more

C1417 (Case 2)

Both of the following conditions are met	-
Control valve solenoid	Non-drive
Brake system voltage 1 (VM1)	Less than 16.44 V

C14DF

Both of the following conditions are met	-
Main relay	On
Power supply for linear solenoid	Less than 16 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 (READY).
Turn the Techstream on.
Drive the vehicle at a speed of 3 km/h (2 mph) or more for 1 second or more.
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

Refer to DTC C1241.

Click here

CAUTION / NOTICE / HINT

NOTICE:

After replacing the skid control ECU (brake booster with master cylinder 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.	CHECK AUXILIARY BATTERY

(a) Check the auxiliary battery voltage.

Standard Voltage:

Tester Connection	Condition	Specified Condition
Auxiliary battery	Power switch on (IG)	11 to 14 V
Auxiliary battery	Power switch on (READY)	11 to 15.5 V

CHARGE OR REPLACE AUXILIARY BATTERY

2.	CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL)

(a) Turn the power switch off.

*a	Front view of wire harness connector (to Skid Control ECU (Brake Booster with Master Cylinder Assembly))

(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
A35-15 (+BI1) - Body ground	Always	11 to 14 V
A35-5 (+BI2) - Body ground	Always	11 to 14 V
A35-52 (BS) - Body ground	Always	11 to 14 V
A35-23 (IG1) - Body ground	Power switch on (IG)	11 to 14 V
A35-9 (IG2) - Body ground	Power switch on (IG)	11 to 14 V

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

3.	RECONFIRM DTC

(a) Turn the power switch off.

(b) Reconnect the A35 skid control ECU (brake booster with master cylinder 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
DTCs C1417 and C14DF are not output.	A
DTCs C1417 and/or C14DF are output.	B

USE SIMULATION METHOD TO CHECK

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

Deceleration Sensor Internal Circuit (C1419,C1435)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

If an internal malfunction signal from the yaw rate and acceleration sensor (airbag ECU assembly) is detected by the skid control ECU (brake booster with master cylinder assembly), DTC C1419 and/or DTC C1435 is stored.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1419	Deceleration Sensor Internal Circuit	1137	Acceleration sensor internal malfunction signal is detected.	Acceleration sensor (airbag ECU assembly)	Comes on	INF Code 1137: SAE Code C0520 (Case 3) ABS DTC
C1435	Yaw Rate Sensor Internal Circuit	711 712	Yaw rate sensor internal malfunction signal is detected.	Yaw rate sensor (airbag ECU assembly)	Does not come on	VSC DTC

DTC No.

Detection Item

INF Code

DTC Detection Condition

Trouble Area

MIL

Note

C1419

Deceleration Sensor Internal Circuit

1137

Acceleration sensor internal malfunction signal is detected.

Acceleration sensor (airbag ECU assembly)

Comes on

INF Code 1137: SAE Code C0520 (Case 3)
ABS DTC

C1435

Yaw Rate Sensor Internal Circuit

711

712

Yaw rate sensor internal malfunction signal is detected.

Yaw rate sensor (airbag ECU assembly)

Does not come on

VSC DTC

MONITOR DESCRIPTION

C0520 (Case 3):

The acceleration sensor (airbag ECU assembly) detects a malfunction in an internal sensor (longitudinal G sensor or lateral G sensor) during self-diagnosis. When an abnormal acceleration sensor (airbag ECU assembly) data value is received via CAN communication, the skid control ECU (brake booster with master cylinder assembly) judges that the acceleration sensor (airbag ECU assembly) is malfunctioning and illuminates the MIL and stores this DTC.

MONITOR STRATEGY

C0520 (Case 3)

Related DTCs	C0520 (Case 3): Acceleration sensor internal malfunction
Required Sensors/Components(Main)	Acceleration sensor (airbag ECU assembly)
Required Sensors/Components(Related)	Skid control ECU (brake booster with master cylinder assembly)
Frequency of Operation	Continuous
Duration	-
MIL Operation	Immediately
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

C0520 (Case 3)

Monitor runs whenever the following DTCs are not stored	None
Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)	Not detected

TYPICAL MALFUNCTION THRESHOLDS

C0520 (Case 3)

Either of the following conditions is met	-
Acceleration sensor 1 (longitudinal G) error (CAN communication data)	"1" (abnormality)
Acceleration sensor 2 (lateral G) error (CAN communication data)	"1" (abnormality)

COMPONENT OPERATING RANGE

C0520 (Case 3)

All of the following conditions are met	-
Lost communication with yaw rate and acceleration sensor (airbag ECU assembly)	Not detected
Yaw rate and acceleration sensor power supply voltage (IG) invalidation/validation (CAN communication data)	"0" (valid)
Acceleration sensor 1 (longitudinal G) error (CAN communication data)	"0" (no abnormality)
Acceleration sensor 2 (lateral G) error (CAN communication data)	"0" (no abnormality)

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 10 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 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.

CAUTION / NOTICE / HINT

NOTICE:

After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

Click here

PROCEDURE

1.	REPLACE AIRBAG ECU ASSEMBLY

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

Click here

END

Malfunction in Deceleration Sensor (C1420)

DESCRIPTION

The airbag ECU assembly has a built-in yaw rate and acceleration sensor and detects the vehicle condition using 2 circuits (GL1, GL2).

The skid control ECU (brake booster with master cylinder assembly) receives signals from the yaw rate and acceleration sensor (airbag ECU assembly) via CAN communication.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	MIL	Note
C1420	Malfunction in Deceleration Sensor	571	After the difference between GL1 and GL2 is 0.6 G or more with the vehicle stopped, the difference between GL1 and GL2 does not drop below 0.4 G or more for 60 seconds or more.	Acceleration sensor (airbag ECU assembly) installed improperly Acceleration sensor (airbag ECU assembly)	Does not come on	ABS DTC

CAUTION / NOTICE / HINT

NOTICE:

After replacing or reinstalling the yaw rate and acceleration sensor (airbag ECU assembly), perform yaw rate and acceleration sensor zero point calibration after clearing previously calibrated data.

Click here

PROCEDURE

1.	CHECK AIRBAG ECU ASSEMBLY INSTALLATION

(a) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.

Click here

OK:

The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.

The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.

REPLACE AIRBAG ECU ASSEMBLY

INSTALL AIRBAG ECU ASSEMBLY CORRECTLY

Rear Speed Sensor RH Circuit Output (C1415,C1416)

Open in Stop Switch Circuit (C1425,P0573)

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