PRE-RELEASE
DTC 28 REAR LEFT ABNORMAL ABS WHEEL SPEED SENSOR SIGNAL
| DTC 28 REAR LEFT ABNORMAL ABS WHEEL SPEED SENSOR SIGNAL |
DIAGNOSIS:
| • |
Faulty
ABS wheel speed sensor signal (noise, irregular signal, etc.)
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| • |
Faulty harness/connector
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TROUBLE SYMPTOM:
ABS does not operate.
WIRING DIAGRAM:
CHECK OUTPUT OF ABS WHEEL SPEED SENSOR USING Vehicle Diagnostic Interface.
Select “Current data display & Save” on the Vehicle Diagnostic Interface.Read the ABS wheel speed sensor output corresponding to faulty system in the Vehicle Diagnostic Interface data display mode.
Does the speed indicated on display change in response to speedometer reading during acceleration/deceleration when the steering wheel is in straight-ahead position?
| Yes |
| No |
CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.Is there poor contact in connectors between ABSCM&H/U and ABS wheel speed sensor?
| Yes |
Repair the connector.
| No |
CHECK SOURCES OF SIGNAL NOISE.
Is the car telephone or wireless transmitter properly installed?
| Yes |
| No |
Properly install the car telephone or wireless transmitter.
CHECK SOURCES OF SIGNAL NOISE.
Are noise sources (such as an antenna) installed near the sensor harness?
| Yes |
Install the noise sources apart from sensor harness.
| No |
CHECK ABSCM&H/U.
Connect all connectors.Erase the memory.
Perform the inspection mode.
Read out the DTC.
Is the same DTC as in the current diagnosis still being output?
| Yes |
Replace the ABSCM&H/U.
| No |
CHECK ANY OTHER DTC APPEARANCE.
Are other DTCs being output?
| Yes |
Proceed with the diagnosis corresponding to DTC.
| No |
A temporary noise interference.
CHECK INSTALLATION OF ABS WHEEL SPEED SENSOR.
Are the ABS wheel speed sensor installation bolts tightened 33 Nm (3.3 kgf-m, 24 ft-lb)?
| Yes |
| No |
Tighten the ABS wheel speed sensor installation bolts securely.
CHECK ABS WHEEL SPEED SENSOR GAP.
Measure the tone wheel to ABS wheel speed sensor piece gap over entire perimeter of wheel.Is the gap as following value? Front wheel: 0.3 — 0.8 mm (0.012 — 0.031 in) Rear wheel: 0.7 — 1.2 mm (0.028 — 0.047 in)
| Yes |
| No |
| • |
Adjust the gap.
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| • |
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PREPARE OSCILLOSCOPE.
Is an oscilloscope available?
| Yes |
| No |
CHECK ABS WHEEL SPEED SENSOR SIGNAL.
Raise all four wheels off ground.Turn the ignition switch to OFF.
Connect the oscilloscope to the connector.
Turn the ignition switch to ON.
Rotate the wheels and measure voltage at specified frequency.
| Note | ||
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When this inspection is completed, the ABSCM&H/U sometimes stores DTC 29 or DTC 56. |
Connector & terminal
DTC 22
(B15) No. 1 (+) — No. 2 (−):
DTC 24
(B62) No. 20 (+) — No. 24 (−):
DTC 26
(B99) No. 10 (+) — No. 9 (−):
DTC 28
(B99) No. 5 (+) — No. 4 (−):
Is the waveform pattern on oscilloscope as shown in the figure?
| Yes |
| No |
CHECK CONTAMINATION OF ABS WHEEL SPEED SENSOR OR TONE WHEEL.
Remove the disc rotor or drum from hub in accordance with DTC.Is the ABS wheel speed sensor piece or tone wheel contaminated by dirt or other foreign matter?
| Yes |
Thoroughly remove dirt or other foreign matter.
| No |
CHECK DAMAGE OF ABS WHEEL SPEED SENSOR OR TONE WHEEL.
Are there broken or damaged in the ABS wheel speed sensor piece or tone wheel?
| Yes |
| No |
Replace the ABS wheel speed sensor
or tone wheel. Front:
Rear:
and Front:
Rear:
CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.Is the runout less than 0.05 mm (0.0020 in)?
| Yes |
| No |
Replace the tone wheel. Front:
Rear:
CHECK RESISTANCE OF ABS WHEEL SPEED SENSOR.
Turn the ignition switch to OFF.Disconnect the connector from ABS wheel speed sensor.
Measure the resistance between ABS wheel speed sensor connector terminals while shaking the harness lightly.
Terminals
Front RH No. 1 — No. 2:
Front LH No. 1 — No. 2:
Rear RH No. 1 — No. 2:
Rear LH No. 1 — No. 2:
Is the resistance as following value? Front: 1 — 1.5 kΩ Rear: 1.025 — 1.265 kΩ
| Yes |
| No |
Replace the ABS wheel speed sensor.
Front:
Rear:
CHECK GROUND SHORT OF ABS WHEEL SPEED SENSOR.
Measure the resistance between ABS wheel speed sensor and chassis ground.Terminals
Front RH No. 1 — Chassis ground:
Front LH No. 1 — Chassis ground:
Rear RH No. 1 — Chassis ground:
Rear LH No. 1 — Chassis ground:
Is the resistance more than 1 MΩ?
| Yes |
| No |
Replace the ABS wheel speed sensor.
Front:
Rear:
CHECK HARNESS/CONNECTOR BETWEEN ABSCM&H/U AND ABS WHEEL SPEED SENSOR.
Connect the connector to ABS wheel speed sensor.Disconnect the connector from ABSCM& H/U.
Measure the resistance at ABSCM&H/U connector terminals.
Connector & terminal
DTC 22
(B301) No. 6 — No. 5:
DTC 24
(B301) No. 1 — No. 16:
DTC 26
(B301) No. 19 — No. 4:
DTC 28
(B301) No. 3 — No. 2:
Is the resistance as following value? Front: 1 — 1.5 kΩ Rear: 1.025 — 1.265 kΩ
| Yes |
| No |
Repair the harness/connector between ABSCM&H/U and ABS wheel speed sensor.
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U connector and chassis ground.Connector & terminal
DTC 22
(B301) No. 6 — Chassis ground:
DTC 24
(B301) No. 1 — Chassis ground:
DTC 26
(B301) No. 19 — Chassis ground:
DTC 28
(B301) No. 3 — Chassis ground:
Is the resistance more than 1 MΩ?
| Yes |
| No |
Repair the harness/connector between ABSCM&H/U and ABS wheel speed sensor.
CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure the resistance between ABSCM&H/U and chassis ground.Connector & terminal
(B301) No. 15 — Chassis ground:
Is the resistance less than 0.5 Ω?
| Yes |
| No |
Repair the ABSCM&H/U ground harness.
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between ABSCM&H/U and ABS wheel speed sensor?
| Yes |
Repair the connector.
| No |
CHECK SOURCES OF SIGNAL NOISE.
Is the car telephone or the wireless transmitter properly installed?
| Yes |
| No |
Properly install the car telephone or wireless transmitter.
CHECK SOURCES OF SIGNAL NOISE.
Are noise sources (such as an antenna) installed near the sensor harness?
| Yes |
Install the noise sources apart from sensor harness.
| No |
CHECK ABSCM&H/U.
Connect all connectors.Erase the memory.
Perform the inspection mode.
Read out the DTC.
Is the same DTC as in the current diagnosis still being output?
| Yes |
Replace the ABSCM&H/U.
| No |
CHECK ANY OTHER DTC APPEARANCE.
Are other DTCs being output?
| Yes |
Proceed with the diagnosis corresponding to DTC.
| No |
| • |
A temporary noise interference.
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| • |
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