Error P1320 is one of the most common problems on cars Nissan Cefiroequipped with SR or VQ series engines. This code indicates a lack of signal from the crankshaft position sensor (CPS), which is critical for the operation of the ignition and fuel injection system. When the electronic control unit (ECU) does not receive correct data about the position and speed of the crankshaft, the engine either does not start or stalls while driving.
Owners Nissan Cefiro Often faced with a situation where the car starts and immediately stalls, or starts with difficulty during a cold start. Ignoring this problem can lead to complete engine failure and costly repairs of other components, since the synchronization of the cylinders is disrupted. Understanding the nature of the error and proper diagnosis will help you avoid unnecessary costs at a car service center.
The essence of the P1320 code and the role of the sensor in the system
Code P1320 in OBD-II terminology stands for “Ignition Signal Output Circuit”, but in practice for Nissan Cefiro this is always a failure in the signal circuit from the DPKV to the ECU. The crankshaft sensor is the “eyes” of the engine computer. Without its readings, the system does not know when to spark and inject fuel.
Unlike many other manufacturers, where the crankshaft and camshaft position sensors work in pairs, the Nissan Cefiro (especially with SR20DE/DET engines) it is the DPKV that is the main source of synchronization. If the signal disappears, the ECU goes into emergency mode, blocking the flow of fuel and spark to protect the catalytic converter and piston group.
It is important to understand that the error can be either electrical (broken wiring, oxidation) or mechanical (destruction of the ring gear or the sensor itself). Sometimes error P1320 occurs due to overheating of the sensor, which loses its magnetic properties when the engine heats above 80 degrees.
- ⚡ No spark on the spark plugs when trying to start.
- 🔥 A sharp increase in engine temperature due to an incorrect advance angle.
- ⚙️ Unstable operation at idle followed by stalling.
⚠️ Attention: If, when starting the engine, the starter turns normally, but the engine does not catch, and the Check Engine light with code P1320 is on, first check the sensor connector, and do not change the ECU.
Typical causes of failure
List of reasons leading to the error P1320 on Nissan Cefiro, is quite wide, but most of them are related to age-related wear and tear on components. The most common problem is the failure of the crankshaft position sensor itself. Over time, the magnet inside the sensor loses strength or the internal winding breaks, causing signal loss.
The second most popular factor is damage to the wiring. On motors SR20DE wire harnesses run close to hot collectors, which over time leads to melting of the insulation and a short circuit to ground or an open circuit. Oxidation of the contacts in the connector is also often observed, especially if the car was operated in conditions of high humidity or reagents.
A less obvious, but possible reason is a violation of the gap between the sensor and the crankshaft pulley. If the sensor is clogged with dirt or if there are no teeth on the pulley (which happens due to a mechanical shock), the signal is not generated. It is also worth checking the condition of the flywheel ring gear or crankshaft pulley, since damaged teeth will prevent the sensor from correctly reading pulses.
- 🔧 Defect of the DPKV sensor itself (coil break).
- 🔥 Melting of wiring due to engine heating.
- 🌧️ Oxidation of contacts in the connection connector.
- The car won't start
- The car stalls while driving
- Cold start problems
- The error appeared on a hot engine
Step-by-step fault diagnosis
To start diagnosing, you need to make sure there is a code P1320 using a diagnostic scanner. Don't rely solely on the Check Engine Light as it may be on for other reasons. Connect the adapter to the OBD-II connector located under the instrument panel and read the error codes. If P1320 is confirmed, proceed with visual inspection.
You need to find the sensor itself. On engines SR20DE it is located on the clutch housing, at the bottom of the cylinder block. On series motors VQ The sensor is also located at the bottom, but access to it can be difficult. Inspect the connector for signs of oxidation, moisture, or mechanical damage to the housing.
The next step is to check the resistance of the sensor with a multimeter. To do this, you need to disconnect the connector and measure the resistance between the contacts of the sensor itself. Normal value for Nissan Cefiro usually ranges from 250 to 1000 ohms, but the exact numbers depend on the model and year of manufacture. If the resistance is infinite (open) or close to zero (short), the sensor must be replaced.
Also check the integrity of the wiring from the sensor to the ECU. Check the circuits for breaks and check for a short circuit to the car body. Make sure that there are no signs of overheating or rubbing against the body on the wires. If the wiring is intact and the sensor is working properly, the problem may lie in the engine control unit itself, but this rarely happens.
☑️ Diagnostic checklist
⚠️ Attention: When checking the resistance of the sensor, be sure to disconnect it from the vehicle harness. On-site measurements may give false readings due to the influence of other ECU circuits.
Crankshaft sensor replacement procedure
Replacing the crankshaft position sensor with Nissan Cefiro does not require sophisticated equipment, but may take a long time due to inaccessibility. You will need a new quality sensor. It is better to choose original parts or proven analogues, since cheap Chinese copies often have the wrong magnetic gap and can give the error repeatedly.
Allow the engine to cool completely before starting work to avoid burns and damage to the plastic clamps. Remove the engine protection, if installed. Disconnect the negative battery terminal to avoid accidental short circuits when disconnecting the sensor connector.
Unscrew the sensor mounting bolt and carefully remove it. Pay attention to the condition of the O-ring. If it has lost elasticity or cracked, it must be replaced to prevent oil from entering the sensor housing. Install the new sensor, tighten the bolt to the recommended torque and connect the connector until it clicks.
After assembly, do not rush to start the engine. Reset the error using the diagnostic scanner or disconnect the battery for 10-15 minutes. Start the engine and let it idle for 5-10 minutes to ensure stable operation. Carry out a test drive, paying attention to the absence of jerks and dips.
- 🛠️ Use a quality tool to access the bottom bolts.
- 🧼 Clean the seat from dirt and oil before installation.
- 🔋 Don't forget to reset the error after replacing the part.
Before purchasing a new sensor, compare its appearance and rod length with the old one. Differences of even 1-2 mm can cause the pulley teeth to not be read correctly and the error will return.
Wiring and ECU problems: repair nuances
If replacing the sensor did not help and the error P1320 returns, the problem almost certainly lies in the wiring or control unit. By car Nissan Cefiro With high mileage, the harnesses often fray in places where they bend or touch hot engine elements. Carefully inspect the entire path of the wire from the sensor connector to the ECU.
Sometimes the cause of the failure is not a break, but high resistance in the circuit due to oxidation of the contacts inside the ECU connector. The control unit connector is located in the passenger compartment, under the dashboard, and moisture can get there. Carefully remove the connector, clean the contacts with a special spray and dry them.
In rare cases, the ECU itself is faulty. This can happen after a power surge or moisture entering the interior. Diagnosing the control unit requires specialized equipment and skills. If all external circuits are checked and in good order, and the signal from the sensor arrives, but the ECU does not recognize it, the unit will need to be repaired or replaced.
It is also important to check the engine grounding. Poor ground contact can cause parasitic noise that distorts the signal from the crankshaft sensor. Make sure all ground bolts on the engine and body are tight and free of corrosion.
How to check the sensor gap?
A feeler gauge is used to accurately check the gap between the sensor and the pulley. The normal gap is usually 0.5-1.0 mm. If the gap is too large, the signal will be weak. If too small, there is a risk of mechanical contact due to vibrations.
| Parameter | Normal value | Symptom of malfunction |
|---|---|---|
| Winding resistance | 250–1000 Ohm | 0 Ohm or >2000 Ohm |
| Supply voltage | 5V or 12V | No voltage |
| Clearance to pulley | 0.5–1.0 mm | More than 1.5 mm |
| Wire insulation | Holistic | Melting, cracks |
⚠️ Attention: When replacing an ECU, it is necessary to program the new unit for a specific vehicle. You cannot simply “plug in” a new unit, since it will not start the engine without binding the immobilizer.
Repairing wiring is often cheaper than replacing the ECU, but requires careful testing of all circuits and restoration of insulation in places of thermal impact.
Prevention and operating tips
To avoid the error reappearing P1320 on your Nissan Cefiro, it is necessary to regularly pay attention to the condition of the engine and wiring. Once a year, inspect the wiring harnesses, especially in the exhaust manifold area. If the insulation begins to melt, use heat-resistant tape or install a protective shield.
Replacing the crankshaft sensor promptly at the first sign of engine instability will save you time and money. Don't wait until the car stops starting completely. If you notice that the engine takes longer to start than usual or there are jerks while driving, check the sensor immediately.
Use quality spare parts. Cheap analogue sensors often have unstable characteristics and may fail after a few months. Original or proven brands guarantee long service life and correct operation of the ignition system. Also keep the connector clean by periodically spraying it with contact spray.
Do not allow water to enter the engine compartment when washing the engine. Water can get into the sensor connector and cause oxidation of the contacts. If you do wash the engine, thoroughly dry all connectors before starting. This simple rule will help you avoid many electrical problems.
- 🚿 Avoid direct contact of water with connectors when washing.
- 🔍 Once every six months, inspect the wiring for overheating.
- 🛒 Buy only high-quality sensors with a guarantee.
FAQ: Frequently asked questions
Is it possible to get to the service center with error P1320?
If the engine starts and runs, you can drive to the service station at low speed. However, if the car stalls while driving, further movement is dangerous for you and others. In this case, it is better to call a tow truck.
Could P1320 be a false alarm?
Yes, the error can occur due to a temporary network failure or poor contact in the connector. Try resetting the error and driving 50-100 km. If it returns, the problem is real and requires repair.
Do I need to reset adaptations after replacing the sensor?
No special adaptation reset is required for the crankshaft sensor. It is enough to erase the error code from the ECU memory with a scanner or disconnect the battery for 10 minutes.
Does P1320 affect fuel consumption?
If the engine is running in limp mode due to this error, fuel consumption may increase significantly. The ECU tries to keep the engine running using average values, which is ineffective.
Which sensor is better to choose for Nissan Cefiro?
It is recommended to use an original Nissan sensor (the number depends on the year of manufacture) or proven analogues from the Denso, NGK brands. Cheap Chinese copies often have a high percentage of defects.