Lexus ES: 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. |
| Comes on |
|
| 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. |
| 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 |
| Vehicle speed | Higher than 3 km/h (2 mph) |
TYPICAL MALFUNCTION THRESHOLDS
C1417 (Case 1)| IG1 voltage | 17.4 V or more |
| Brake system voltage 1 (VM1) | 16.44 V or more |
| 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 |
| Both of the following conditions are met | - |
| Control valve solenoid | Non-drive |
| Brake system voltage 1 (VM1) | Less than 16.44 V |
| 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.
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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.
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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".
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- 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 | .gif) | CHARGE OR REPLACE AUXILIARY BATTERY |
|
| 2. | CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
| (a) Turn the power switch off. |
|
(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 A45 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 |
|---|---|---|
| A45-15 (+BI1) - Body ground | Always | 11 to 14 V |
| A45-5 (+BI2) - Body ground | Always | 11 to 14 V |
| A45-52 (BS) - Body ground | Always | 11 to 14 V |
| A45-23 (IG1) - Body ground | Power switch on (IG) | 11 to 14 V |
| A45-9 (IG2) - Body ground | Power switch on (IG) | 11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
| 3. | RECONFIRM DTC |
(a) Turn the power switch off.
(b) Reconnect the A45 skid control ECU (brake booster with master cylinder assembly) connector.
(c) Clear the DTCs.
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(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.
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| 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 |
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