Error C1107 on Nissan: Diagnosis and repair of the ABS system

Many car owners Nissan encounter an alarm indication on the dashboard when the ABS icon lights up and a fault code is displayed. Error C1107 is one of the most common problems in anti-lock braking system electrical circuits, causing serious concern among drivers. This error indicates a specific malfunction in the front left wheel speed sensor or its connection circuit, which renders the safety system ineffective.

Ignoring this code may result in the system ABS will not work, increasing the risk of skidding and lengthening the braking distance. You need to run diagnostics as soon as possible to determine whether the problem is mechanical (damage to the wiring or the sensor itself) or electronic (failure in the control unit). Timely intervention avoids costly repairs to the hydraulic module in the future.

The essence of the malfunction and code C1107

Code C1107 in technical documentation Nissan stands for “Left Front Wheel Speed Sensor Circuit Malfunction”. The control system constantly monitors the resistance and the signal coming from the sensor, and if the parameters go beyond acceptable limits, an emergency mode is activated. This means that the control unit cannot correctly determine the rotation speed of this particular wheel.

Unlike other errors, which may be caused by temporary interference, C1107 most often indicates a physical open circuit or short circuit. The speed sensor operates on the principle of inductance or the Hall effect, and any violation of the integrity of its winding or wiring is immediately recorded by the computer. Without a working signal from this wheel, the system cannot correctly distribute the braking force.

It is important to understand that an error can be recorded not only due to the failure of the sensor itself, but also due to problems with the wiring harness going to the wheel. Vibration and aggressive suspension environments often cause insulation chafing. Often the problem lies not in the sensor itself, but in the oxidation of the connector in the steering wheel turning area or in the area of the door cable.

The main reasons for the error

Reasons for the code C1107 can be divided into several categories: mechanical damage, electrical failures and problems with actuators. The most common reason is banal contamination or damage to the ring gear (rotor), which rotates with the wheel hub. If there is dirt stuck to the teeth or they are knocked down, the sensor will not be able to read the correct pulses.

The electrical part is also subject to wear and tear. The wires going to the front wheel often rub against the suspension elements or the body. In addition, disconnection of contacts in the sensor connection block due to moisture and salt ingress leads to high circuit resistance. In rare cases, the cause is a failure of the ABS control unit (ABS ECU), although this happens less frequently than a sensor failure.

The list of most likely causes includes:

• 💥 Damage to the wiring or open circuit of the left front wheel speed sensor.
• 💥 Oxidation or corrosion of contacts in the sensor connector and ABS block.
• 💥 Mechanical damage or contamination of the rotor toothed ring.
• 💥 Malfunction of the speed sensor itself (winding rupture or loss of magnetic properties).

Diagnostics and visual inspection

Before purchasing new parts, a thorough visual inspection is necessary. Start by checking the wheel sensor on the left side. Raise the vehicle on a lift or jack and inspect the wiring harness running from the sensor to the vehicle's main harness. Look for signs of rubbing, melting, or signs of rodents.

Pay special attention to the sensor connector. If it is placed in a humid environment, green or white oxides may form inside. Carefully disconnect the connector and inspect the pins. If necessary, clean them with alcohol and treat them with contact lubricant. Also check the integrity of the ring gear on the wheel hub, which may be hidden under the mudguard.

For accurate diagnosis you will need a multimeter. You need to measure the resistance of the sensor. The normal value usually ranges from 1000 to 2000 ohms (depending on the model Nissan). If the multimeter shows infinite resistance (open) or zero (short circuit), the sensor must be replaced. Also check for short to ground.

Step-by-step repair instructions

If the diagnostics confirm that the sensor or wiring is faulty, repairs must begin. The process of replacing the front wheel speed sensor Nissan usually does not require dismantling the suspension, but requires care. You'll need a set of wrenches, a multimeter, and possibly some penetrating lubricant, as the mounting bolts tend to stick.

You must first disconnect the battery terminal to avoid short circuit when working with the wiring. Next, remove the wheel and unscrew the sensor mounting bolt. The sensor may be stuck, so use WD-40. Remove the old sensor and inspect the hole for dirt and rust.

Before installing a new element, apply a thin layer of lubricant to the sensor body to ensure a tight fit and protection from moisture. Connect the new connector, making sure the latch clicks into place. After assembling all the elements, you need to reset the error through the diagnostic scanner.

Here is a checklist of actions for safe repairs:

• ✅ Disconnect the battery before starting electrical work.
• ✅ Clean the sensor installation site from dirt and rust.
• ✅ Check the integrity of the ring gear before installing a new sensor.
• ✅ Use only original or certified analog parts.

Checking the wiring and connection diagram

If replacing the sensor did not help and the error C1107 comes back, the problem lies in the wiring. You need to run the harness from the sensor connector to the ABS control unit connector. The connection diagram usually includes two wires: signal and ground (or two signal for a differential signal). The test must be carried out with a connected multimeter in resistance measurement mode.

Pay special attention to the sections of the harness passing through the wheel arch. Here the wires are exposed to maximum vibration and exposure to reagents. Often a wire break occurs inside the insulation, which cannot be seen visually. Use a multimeter to test the continuity of each wire individually without disconnecting the connectors at both ends (voltage drop or resistance method).

Compare the data obtained with the table below to understand the condition of the circuit:

Validation parameter	Normal value	Fault value	Action
Sensor resistance	1000 - 2000 Ohm	Infinity (open) or 0 Ohm	Replacing the sensor
Ground resistance	Infinity	Low resistance	Finding a short circuit
Wire integrity	Less than 1 ohm	More than 5 ohms	Repair or replacement of harness
Supply voltage (if active)	5V or 12V	0V	Checking the ABS unit

What to do if the connector is broken?

If the sensor connector is broken or oxidized beyond recognition, do not attempt to solder it without experience. It is best to buy a new connector and crimp it onto the wires using heat shrink and high-quality terminals. This will ensure reliable contact for many years.

Resetting the error and testing the system

After all repair work has been completed, the accumulated errors must be reset. For this purpose, an OBD-II diagnostic scanner is used, compatible with the protocols Nissan. Connect the device to the port, go to the ABS system section and select the “Error Reset” or “Clear DTC” function.

If you don't have access to professional equipment, you can try the "battery reset" method, but this is not always effective for security systems. Disconnect the negative terminal for 10-15 minutes, then connect it back. This will reset the temporary memory of some modules, but permanent errors may remain. It's better to use a scanner.

After the reset, take it for a test drive. Accelerate to a speed of 20-30 km/h and perform several smooth and sharp braking. Make sure the brake pedal does not pulsate uncontrollably and the ABS light does not come on again. If the error C1107 returned immediately after the reset, which means the problem has not been completely eliminated.

Important note: on some models Nissan After replacing the sensor, a system initialization or adaptation procedure may be required. This is done through the diagnostic interface in a specialized service. Without adaptation, the system may become unstable.

Prevention and Maintenance

To make a mistake C1107 has not returned, it is necessary to carry out regular preventive measures. Inspect the ABS sensor wiring after every winter or off-road ride. Dirt and reagents accelerate the wear of insulation. Cleaning the connectors and applying silicone grease significantly extends the life of the contacts.

Monitor the condition of the wheels and brakes. Severe wear on the brake discs or hub runout can create vibrations that, over time, can destroy the wiring near the sensor. It is also recommended to check the gap between the sensor and the ring gear when replacing the wheel bearing.

Use only high-quality spare parts. Cheap analogues of speed sensors often have unstable resistance parameters, which can lead to false alarms. Original or proven brands guarantee long-term operation of the system.

⚠️ Attention: Never try to reset an ABS error by simply turning off the fuse without eliminating the cause. This may result in loss of fault information and make future diagnosis more difficult.

⚠️ Attention: Working on the ABS system requires caution. An incorrect connection may result in brake failure when driving. If you are not confident in your abilities, turn to professionals.

Why does error C1107 appear after washing?

After washing, water may enter the sensor connectors, causing a temporary short circuit or change in resistance. If the contacts are oxidized, moisture will only worsen the situation. Water can also get inside the sensor itself if the seal of its housing is broken.

Is it possible to drive with error code C1107?

Technically, the car will move, since the mechanical brakes operate independently of the ABS. However, the anti-lock system will not function on the left front wheel, which may lead to skidding during emergency braking. Driving is not recommended, especially in rain or snow.

Is it worth replacing both sensors at once?

If the error concerns only the left front wheel, it is not necessary to change the right one if it is in good condition. However, if the car has a high mileage and the sensors are old, replacing them in pairs can save time and money in the future, since they have a similar service life.

How to test a sensor without a multimeter?

It is difficult to check the sensor without a multimeter, but you can try the elimination method. If upon inspection the wiring is intact and the connector is clean, and after replacing the sensor the error disappears, then the problem was there. You can also compare the speed scanner readings of all wheels while driving.