Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSNISSAN-DATSUN2024FRONTIER SL, RWDREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLBRAKE CONTROL SYSTEM (VDC/TCS/ABS) (DTC/CIRCUIT DIAGNOSIS)DTC/CIRCUIT DIAGNOSISDTC C1103: WHEEL SENSORDTC DIAGNOSIS PROCEDURE

2024 Nissan-Datsun Frontier SL, RWD

DTC Diagnosis Procedure

2024 Nissan-Datsun Frontier SL, RWDSECTION DTC Diagnosis Procedure

CAUTION:

Never check between wheel sensor harness connector terminals.

CHECK WHEEL SENSOR
1. 1. Ignition switch OFF.
  2. Check the front wheel sensor RH for damage.
Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.
REPLACE WHEEL SENSOR (1)
1. CONSULT
  1. Replace the front wheel sensor RH. Refer to Removal and Installation .
  2. Erase "Self Diagnostic Result" mode of "ABS".
  3. Ignition switch OFF -> ON -> OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF or ON position.
  4. Start the engine.
  5. Drive the vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.
    NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.
  6. Stop the vehicle.
  7. Ignition switch OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF position.
  8. Start the engine.
    NOTE: Wait at least 10 seconds after starting the engine.
  9. Select "Self Diagnostic Result" mode of "ABS".
Is DTC "C1103" detected?

YES>>

GO TO 3.

NO>>

Inspection End.
CHECK CONNECTOR
1. 1. Ignition switch OFF.
  2. Check the ABS actuator and electric unit (control unit) harness connector for disconnection or looseness.
  3. Check the front wheel sensor RH harness connector for disconnection or looseness.
Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair / replace harness or connector, securely lock the connector, and GO TO 4.
PERFORM SELF DIAGNOSTIC RESULT (1)
1. CONSULT
  1. Erase "Self Diagnostic Result" mode of "ABS".
  2. Ignition switch OFF -> ON -> OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF or ON position.
  3. Start the engine.
  4. Drive the vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.
    NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.
  5. Stop the vehicle.
  6. Ignition switch OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF position.
  7. Start the engine.
    NOTE: Wait at least 10 seconds after starting the engine.
  8. Select "Self Diagnostic Result" mode of "ABS".
Is DTC "C1103" detected?

YES>>

GO TO 5.

NO>>

Inspection End.
CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) POWER SUPPLY AND GROUND CIRCUIT
1. Check the ABS actuator and electric unit (control unit) power supply and ground circuits. Refer to Diagnosis Procedure .
Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair / replace harness, connector, fuse, or fusible link.
CHECK TERMINAL
1. 1. Ignition switch OFF.
  2. Disconnect ABS actuator and electric unit (control unit) harness connector and then check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
  3. Disconnect front wheel sensor RH harness connector and check each wheel sensor pin terminal for damage or loose connection with harness connector.
Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair / replace harness, connector, or terminal, and GO TO 7.
PERFORM SELF DIAGNOSTIC RESULT (2)
1. CONSULT
  1. Connect ABS actuator and electric unit (control unit) harness connector.
  2. Connect front wheel sensor RH harness connector.
  3. Erase "Self Diagnostic Result" mode of "ABS".
  4. Ignition switch OFF -> ON -> OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF or ON position.
  5. Start the engine.
  6. Drive the vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.
    NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.
  7. Stop the vehicle.
  8. Ignition switch OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF position.
  9. Start the engine.
    NOTE: Wait at least 10 seconds after starting the engine.
  10. Select "Self Diagnostic Result" mode of "ABS".
Is DTC "C1103" detected?

YES>>

GO TO 8.

NO>>

Inspection End.

CHECK WHEEL SENSOR HARNESS

Ignition switch OFF.
Disconnect ABS actuator and electric unit (control unit) harness connector.
Disconnect front wheel sensor RH harness connector.

Check the continuity between ABS actuator and electric unit (control unit) harness connector and front wheel sensor RH harness connector. (Check the continuity while turning steering wheel left and right, or while moving center harness in wheel housing.)

Power Supply Circuit

ABS actuator and electric unit (control unit)		Front wheel sensor RH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E127	33	E117	1	Yes

Signal Circuit

ABS actuator and electric unit (control unit)		Front wheel sensor RH		Continuity
Connector	Terminal	Connector	Terminal	Continuity
E127	19	E117	2	Yes

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Repair / replace harness or connector, and GO TO 9.

PERFORM SELF DIAGNOSTIC RESULT (3)
1. CONSULT
  1. Connect ABS actuator and electric unit (control unit) harness connector.
  2. Connect front wheel sensor RH harness connector.
  3. Erase "Self Diagnostic Result" mode of "ABS".
  4. Ignition switch OFF -> ON -> OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF or ON position.
  5. Start the engine.
  6. Drive the vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.
    NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.
  7. Stop the vehicle.
  8. Ignition switch OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF position.
  9. Start the engine.
    NOTE: Wait at least 10 seconds after starting the engine.
  10. Select "Self Diagnostic Result" mode of "ABS".
Is DTC "C1103" detected?

YES>>

GO TO 10.

NO>>

Inspection End.
CHECK WHEEL SENSOR OUTPUT SIGNAL
1. 1. Disconnect ABS actuator and electric unit (control unit) harness connector.
  2. Disconnect front wheel sensor RH harness connector.
  3. Connect ABS active wheel sensor tester (SST: NI-45741) to front wheel sensor RH using appropriate adapter.
  4. Turn the ABS active wheel sensor tester power switch ON.
    NOTE: The green POWER indicator should illuminate. If the POWER indicator does not illuminate, replace the battery in the ABS active wheel sensor tester before proceeding.
  5. Spin the wheel of the vehicle by hand and observe the red SENSOR indicator on the ABS active wheel sensor tester. The red SENSOR indicator should flash ON and OFF to indicate an output signal.
    NOTE: If the red SENSOR indicator illuminates but does not flash, reverse the polarity of the tester leads and retest.
Does the ABS active wheel sensor tester detect a signal?

YES>>

Replace the ABS actuator and electric unit (control unit). Refer to Removal and Installation .

NO>>

GO TO 11.
REPLACE WHEEL SENSOR (2)
1. CONSULT
  1. Replace the front wheel sensor RH. Refer to Removal and Installation .
  2. Connect ABS actuator and electric unit (control unit) harness connector.
  3. Erase "Self Diagnostic Result" mode of "ABS".
  4. Ignition switch OFF -> ON -> OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF or ON position.
  5. Start the engine.
  6. Drive the vehicle at approx. 31 MPH (50 km/h) or more for approx. 2 minutes.
    NOTE: Vehicle must be driven after repair or replacement to erase the previous DTCs.
  7. Stop the vehicle.
  8. Ignition switch OFF.
    NOTE: Wait at least 10 seconds after placing ignition switch in the OFF position.
  9. Start the engine.
    NOTE: Wait at least 10 seconds after starting the engine.
  10. Select "Self Diagnostic Result" mode of "ABS".
Is DTC "C1103" detected?

YES>>

Replace the ABS actuator and electric unit (control unit). Refer to Removal and Installation .

NO>>

Inspection End.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.