Diesel Data: Automotive Repair
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DTC 15

DTC 15: Wheel Speed Sensor (Abnormal output signal)

WHEEL SPEED SENSOR CIRCUIT
Refer to DTC 11, 12, 13, 14; Wheel Speed Sensor (Open circuit or short circuit) / DTC 21, 22, 23, 24; Wheel Speed Sensor.

CIRCUIT OPERATION
Refer to DTC 11, 12, 13, 14; Wheel Speed Sensor (Open circuit or short circuit) / DTC 21, 22, 23, 24; Wheel Speed Sensor.

ABS DTC SET CONDITIONS
- DTC 15 is output when output signal produced by any of wheel-speed sensor is abnormal (excluding short and open-circuits).

TROUBLESHOOTING HINTS (The most likely causes for this DTC to set are:)
- Improper installation of the wheel speed sensor
- Malfunction of the wheel speed sensor
- Damaged wiring harness or connector
- Malfunction of the ABS rotor
- Malfunction of the wheel bearing

DIAGNOSIS
Required Special Tool:
- MB991223: Harness Set





STEP: 1. Check the wheel speed sensor installation.
Q:Is the wheel speed sensor bolted securely in place at the front knuckle or the rear knuckle?
YES:Go to Step 2.
No:Install it properly. Then go to Step 8.
STEP: 2. Check the harness wires between ABS-ECU connector A-02 and wheel speed sensor connector A-22.











NOTE: After inspecting intermediate connector C-05, inspect the wires. If intermediate connector C-05 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 8.

Q:Are any harness wires between ABS-ECU connector A02 and wheel speed sensor connector A-22 damaged?
YES:Repair them and go to Step 8.
NO:Go to Step 6
STEP: 3. Check the harness wires between ABS-ECU connector A-02 and wheel speed sensor connector A-37.
Q:Are any harness wires between ABS-ECU connector A 02 and wheel speed sensor connector A-37 damaged?
YES:Repair them and then go to Step 8.
NO:Go to Step 6.














STEP: 4. Check the harness wires between ABS-ECU connector A-02 and wheel speed sensor connector D-11 or D-10 .

NOTE: After inspecting intermediate connectors C-212,C-210 and D-16, inspect the wires. If intermediate connectors C-212, C-210 or D-16 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 8.

Q:Are any harness wires between ABS-ECU connector A02 and wheel speed sensor connector D-11 or D-10 damaged?
YES:Repair them and then go to Step 8.
NO:Go to Step 6.
STEP: 5. Check the wheel speed sensor output voltage.
Output Voltage:
- When measured with a voltmeter: 42 mV or more
- When measured with oscilloscope (maximum voltage): 200 mV or more
Q:Does the voltage meet the specification?
YES:Replace the hydraulic unit (integrated with ABS-ECU) and then go to Step 8.
NO:Go to Step 6.
STEP: 6. Check the wheel speed sensor or ABS rotor. If there is damage in any of the check items, replace the wheel speed sensor.
Check items:
- Wheel speed sensor internal resistance
Standard value: 1.28 - 1.92 k ohms
- Insulation between the wheel speed sensor body and the connector terminals
- Toothed ABS rotor check
Q:Is the wheel speed sensor or ABS rotor damaged?
YES:Replace it and then go to Step 8.
NO:Go to Step 7.
STEP: 7. Check the wheel bearing.
Q:Is the wheel bearing damaged?
YES:Replace it and then go to Step 8.
NO:Go to Step 8.
STEP: 8. Check the diagnostic trouble codes.
Q:Do the diagnostic trouble code 15 reset?
YES:Go to Step 1.
NO:This diagnosis is complete.

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