Lexus ES: Left Front Wheel Speed Sensor Circuit Short to Ground or Open (C050014)
DESCRIPTION
Refer to DTC C050012
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| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C050014 | Left Front Wheel Speed Sensor Circuit Short to Ground or Open | A short or open circuit is detected in the speed sensor signal circuit for 0.12 seconds or more. |
|
*: w/ AVS
DTC Detection Conditions: C050014| Vehicle Condition | |||
|---|---|---|---|
| Pattern 1 | Pattern 2 | ||
| Diagnosis Condition | - | - | - |
| Malfunction Status | An open circuit is detected in the speed sensor signal circuit. | ○ | - |
| A short circuit is detected in the speed sensor signal circuit. | - | ○ | |
| Detection Time | 0.12 seconds or more. | 0.12 seconds or more. | |
| Number of Trips | 1 trip | 1 trip | |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
Refer to DTC C050012.
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CAUTION / NOTICE / HINT
NOTICE:
-
After replacing the skid control ECU (brake actuator assembly), perform acceleration sensor zero point calibration and store system information memorization.
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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. | CHECK VEHICLE |
(a) Check if the vehicle is equipped with AVS.
| Result | Proceed to |
|---|---|
| w/o AVS | A |
| w/ AVS | B |
| B |  | GO TO STEP 5 |
|
| 2. | CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) |
| (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 A48 front speed sensor LH connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| A48-1 (FL+) - A48-2 (FL-) | Engine switch on (IG) | 11 to 14 V |
| NG | | GO TO STEP 4 |
|
| 3. | CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - 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 A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A48 front speed sensor LH 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 |
|---|---|---|
| A48-2 (FL-) or A40-7 (FL-) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FRONT SPEED SENSOR LH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 4. | CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR LH - 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 A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A48 front speed sensor LH 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 |
|---|---|---|
| A48-2 (FL-) - A40-7 (FL-) | Always | Below 1 Ω |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 5. | CHECK HARNESS AND CONNECTOR (SENSOR GROUND CIRCUIT) |
| (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 z24 front speed sensor LH connector.
(c) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(d) Turn the engine switch on (IG).
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| z24-1 (FL+) - z24-2 (FL-) | Engine switch on (IG) | 11 to 14 V |
| NG | | GO TO STEP 8 |
|
| 6. | INSPECT SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH |
| (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 z24 skid control sensor wire with suspension control LH connector.
(c) Disconnect the A42 skid control sensor wire with suspension control LH 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 |
|---|---|---|
| z24-2 (FL-) or A42-5 (FL-) - Body ground and other terminals | Always | 10 kΩ or higher |
| NG | | REPLACE SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH |
|
| 7. | CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - 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 A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A42 skid control sensor wire with suspension control LH 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 |
|---|---|---|
| A42-5 (FL-) or A40-7 (FL-) - Body ground | Always | 10 kΩ or higher |
| OK | | REPLACE FRONT SPEED SENSOR LH |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
| 8. | INSPECT SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH |
| (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 z24 skid control sensor wire with suspension control LH connector.
(c) Disconnect the A42 skid control sensor wire with suspension control LH 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 |
|---|---|---|
| z24-2 (FL-) - A42-5 (FL-) | Always | Below 1 Ω |
| NG | | REPLACE SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH |
|
| 9. | CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE WITH SUSPENSION CONTROL LH - 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 A40 skid control ECU (brake actuator assembly) connector.
(c) Disconnect the A42 skid control sensor wire with suspension control LH 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 |
|---|---|---|
| A42-5 (FL-) - A40-7 (FL-) | Always | Below 1 Ω |
| OK | | REPLACE BRAKE ACTUATOR ASSEMBLY |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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