Toyota Yaris: Vehicle Stability Control System / Left Front Wheel Speed Sensor Circuit Short to Ground or Open (C050014)
DESCRIPTION
Refer to DTC C05001F.
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from |
|---|---|---|---|---|
| C050014 | Left Front Wheel Speed Sensor Circuit Short to Ground or Open | An open in the speed sensor signal circuit continues for 0.5 seconds or more. |
| Brake |
WIRING DIAGRAM
Refer to DTC C05001F.
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CAUTION / NOTICE / HINT
NOTICE:
-
After replacing the skid control ECU (brake actuator assembly), perform "Calibration".
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-
After replacing or removing and installing a speed sensor, perform Dealer Mode (Signal Check) inspection to confirm that the speed sensors are operating correctly.
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PROCEDURE
| 1. | READ VALUE USING GTS (FL SPEED OPEN) |
(a) Operate the GTS to check the Data List.
Chassis > Brake > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| FL Speed Open | Front speed sensor LH open detection | Under intermittent / Normal | Under intermittent: Momentary interruption detected Normal: Momentary interruption not detected | - |
| Tester Display |
|---|
| FL Speed Open |
(b) Select the line graph display.
(c) Check for any momentary interruption in the wire harness and connector.
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OK:
Normal (There are no momentary interruptions.)
NOTICE:
Perform the above inspection before removing the sensor and connector.
| NG |
 | GO TO STEP 5 |
|
| 2. | READ VALUE USING GTS (FL WHEEL SPEED) |
(a) Operate the GTS to check the Data List.
Chassis > Brake > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| FL Wheel Speed | Front wheel speed sensor LH reading | Min.: 0.0 km/h (0.0 mph) Max.: 6553.5 km/h (4072 mph) | Vehicle stopped: 0.0 km/h (0.0 mph) | When driving at constant speed: No large fluctuations |
| Tester Display |
|---|
| FL Wheel Speed |
(b) Drive the vehicle and perform a road test.
(c) Check the speed value output from the speed sensor displayed on the GTS.
HINT:
Factors that affect the indicated vehicle speed include tire size, tire pressure, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart.
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OK:
The speed value output from the speed sensor displayed on the GTS is similar to the speed indicated on the speedometer.
| NG |
 | GO TO STEP 5 |
|
| 3. | CLEAR DTC |
(a) Operate the GTS to clear the codes.
Chassis > Brake > Clear DTCs(b) Press the DTC clear button.
(c) Turn the ignition switch off.
|
| 4. | RECONFIRM DTC |
(a) Based on the Freeze Frame Data and interview with the customer, attempt to reproduce the conditions when the malfunction occurred.
(b) Operate the GTS to read the DTCs.
Chassis > Brake > Trouble Codes(c) Check if the same DTC is output.
| Result | Proceed to |
|---|---|
| C050014 is not output | A |
| C050014 is output | B |
| A |
 | USE SIMULATION METHOD TO CHECK |
| B |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
| 5. | INSPECT HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - BRAKE ACTUATOR ASSEMBLY) |
(a) Turn the ignition 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.
(c) Disconnect the A108 skid control ECU (brake actuator assembly) connector.
(d) Disconnect the A22 front speed sensor LH 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 |
|---|---|---|
| A22-1 (FL+) - A108-18 (FL+) | Always | Below 1 Ω |
| A22-1 (FL+) or A108-18 (FL+) - Body ground | Always | 10 kΩ or higher |
| A22-2 (FL-) - A108-17 (FL-) | Always | Below 1 Ω |
| A22-2 (FL-) or A108-17 (FL-) - Body ground | Always | 10 kΩ or higher |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 6. | INSPECT BRAKE ACTUATOR ASSEMBLY (SENSOR POWER SOURCE CIRCUIT) |
| (a) Reconnect the A108 skid control ECU (brake actuator assembly) connector. |
|
(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.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A22-1 (FL+) - Body ground | Ignition switch ON | 11 to 14 V |
| OK |
 | REPLACE FRONT SPEED SENSOR LH |
| NG |
 | REPLACE BRAKE ACTUATOR ASSEMBLY |
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