ABS (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C0104 ABS WHEEL SPEED SENSOR MALFUNCTION FL SENSOR (BROKEN WIRE, INPUT VOLTAGE TOO HIGH)

DTC C0104 ABS WHEEL SPEED SENSOR MALFUNCTION FL SENSOR (BROKEN WIRE, INPUT VOLTAGE TOO HIGH)

DTC DETECTING CONDITION:

• Defective ABS wheel speed sensor (broken wire, input voltage too high)

• Defective harness connector

TROUBLE SYMPTOM:

ABS does not operate.

WIRING DIAGRAM:

• LHD model

• RHD model

STEP	CHECK	YES	NO
1.CHECK POOR CONTACT IN CONNECTOR. Check if there is poor contact between ABSCM&H/U and ABS wheel speed sensor.	Is there poor contact?	Repair the connector.
2.CHECK HARNESS CONNECTOR BETWEEN ABSCM&H/U AND ABS WHEEL SPEED SENSOR. 1) Disconnect the connector (B301) from ABSCM&H/U. 2) Disconnect the connector from the ABS wheel speed sensor. 3) Measure the resistance between ABSCM&H/U connector and ABS wheel speed sensor connector. Connector & terminal DTC C0101 (B301) No. 3 — (R72) No. 2: (B301) No. 4 — (R72) No. 1: DTC C0102 (B301) No. 2 — (R73) No. 2: (B301) No. 17 — (R73) No. 1: DTC C0103 (B301) No. 5 — (B6) No. 2: (B301) No. 6 — (B6) No. 1: DTC C0104 (B301) No. 16 — (B15) No. 2: (B301) No. 1 — (B15) No. 1:	Is the resistance less than 0.5 Ω?		Repair the harness connector between ABSCM&H/U and ABS wheel speed sensor.
3.CHECK GROUND SHORT OF HARNESS. Measure the resistance between the ABSCM&H/U connector and chassis ground. Connector & terminal DTC C0101 (B301) No. 4 — Chassis ground: DTC C0102 (B301) No. 17 — Chassis ground: DTC C0103 (B301) No. 6 — Chassis ground: DTC C0104 (B301) No. 1 — Chassis ground:	Is the resistance 1 MΩ or more?		Repair the harness connector between ABSCM&H/U and ABS wheel speed sensor.
4.CHECK ABS WHEEL SPEED SENSOR POWER SUPPLY CIRCUIT. 1) Connect ABSCM&H/U connector. 2) Turn the ignition switch to ON. 3) Measure the voltage between ABS wheel speed sensor connector and chassis ground. Connector & terminal DTC C0101 (R72) No. 2 (+) — Chassis ground (−): DTC C0102 (R73) No. 2 (+) — Chassis ground (−): DTC C0103 (B6) No. 2 (+) — Chassis ground (−): DTC C0104 (B15) No. 2 (+) — Chassis ground (−):	Is the voltage 5 — 16 V?
5.CHECK THE ABSCM&H/U POWER SUPPLY CIRCUIT. 1) Turn the ignition switch to OFF. 2) Disconnect the ABSCM&H/U connectors. 3) Turn the ignition switch to ON. 4) Measure the voltage between ABSCM&H/U connector and chassis ground. Connector & terminal (B301) No. 18 (+) — (B301) No. 15 (−):	Is the voltage 10 — 15 V?		Check the generator, battery and ABSCM&H/U power supply circuit.
6.CHECK ABS WHEEL SPEED SENSOR SIGNAL. 1) Install the ABS wheel speed sensor. 2) Prepare an oscilloscope. 3) Check the ABS wheel speed sensor.	Is the pattern the same waveform as shown in the figure?		Replace the ABS wheel speed sensor.
7.CHECK ABSCM&H/U. 1) Connect all the connectors. 2) Clear the memory. 3) Perform the Inspection Mode. 4) Read the DTC.	Is the same DTC displayed?	Replace the ABSCM only.
8.CHECK FOR ANY OTHER DTC ON DISPLAY.	Is there any other DTC displayed?	Perform the diagnosis according to DTC.	It results from a temporary noise interference.