Toyota Avalon Service & Repair Manual: 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

  1. Connect the Techstream to the DLC3.
  2. Turn the power switch on (IG).
  3. Turn the Techstream on.
  4. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  5. Turn the power switch off.
  6. Turn the power switch on (READY).
  7. Turn the Techstream on.
  8. Drive the vehicle at a speed of 3 km/h (2 mph) or more for 1 second or more.
  9. Enter the following menus: Chassis / ABS/VSC/TRAC / Trouble Codes.
  10. Read the DTCs.

    HINT:

    • If a DTC is output, the system is malfunctioning.
    • If a DTC is not output, perform the following procedure.
  11. 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

NG

CHARGE OR REPLACE AUXILIARY BATTERY

OK

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.

(c) 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 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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

OK

3.

RECONFIRM DTC

(a) Turn the power switch off.

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

(c) Clear the DTCs.

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

A

USE SIMULATION METHOD TO CHECK

B

REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY

    Rear Speed Sensor RH Circuit Output (C1415,C1416)

    Deceleration Sensor Internal Circuit (C1419,C1435)

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