Electronic engine control unit (ECU) in Nissan Note - This is the “brain” of the car, responsible for the correct operation of the power unit, fuel system and other critical components. Without an accurate understanding of the pinout of the unit's connectors, fault diagnosis or modifications (for example, chip tuning) turn into a lottery with the risk of damaging the electronics. In this article we will look at all key ECU connectors, their purpose, as well as nuances that are not indicated even in official manuals.

Feature Nissan Note (especially models E11 And E12) is that the pinout may differ depending on the year of manufacture, engine type (HR15DE, HR16DE) and even the region of delivery. For example, European versions often have additional pins for systems Eco Mode or Start/Stop, which are not available in Asian counterparts. We have collected current data for the most common modifications, including unique pins for diagnostics via the CAN bus, which are often ignored in universal circuits.

Main connectors of the Nissan Note ECU: overview and location

B Nissan Note There are two main ECU connectors:

  • 🔌 Connector A (main) — is responsible for power supply, ignition, sensors and actuators. Usually has 80-90 contacts.
  • 🔌 Connector B (diagnostic) — contains communication lines with diagnostic equipment (OBD-II, CAN, K-Line). Typically 32-40 contacts.
  • 🔌 Connector C (optional) - present in models with automatic transmission (CVT) or hybrid versions. Responsible for interaction with the transmission.

Physically, the ECU is located under the hood, next to the battery (in models before 2013) or in the passenger compartment under the dashboard on the passenger side (in restyled versions after 2016). To access the connectors, you must:

  1. Disconnect the negative terminal of the battery (required!).
  2. Remove the protective cover of the ECU (attached with 2-3 bolts or latches).
  3. Carefully remove the connector latches by pulling them upward (do not pull on the wires!).
⚠️ Attention: In models Nissan Note E12 (2013–2020) connector A has a plastic retainer that breaks if removed incorrectly. It is impossible to replace it separately - you will have to buy the entire connector (part number: 28460-4M010).
📊 What engine is installed in your Nissan Note?
  • HR15DE
  • HR16DE
  • K9K (diesel)
  • Other
  • I don't know

Connector A pinout: power supply, sensors and actuators

Connector A is the largest and most important. Below is a table with the assignment of key contacts for the engine HR16DE (similar for HR15DE, but without pin 35 for the system VVL).

Contact number Purpose Wire color Notes
1 Power supply +12V (from battery) Red Constant power, does not turn off when the ignition is turned off.
15 Ignition +12V (IG1) Black and yellow Activated when the key is turned to the ON position.
30 Ground (GND) Black Total weight for sensors. Check the resistance to the body (should be <0.5 Ohm).
45 Crankshaft Position (CKP) Sensor Signal Green-white If it breaks, the engine will not start. Check with an oscilloscope!
60 Cylinder #1 injector control Blue Pulse signal. In the event of a short circuit, the ECU goes into emergency mode.

For troubleshooting, the most critical contacts are those associated with camshaft position (CMP) sensors And oxygen sensors (HO2S). For example, if the engine is misfiring, first check:

  • 🔧 Contact 45 (CKP) - open or short to ground.
  • 🔧 Contacts 50–53 (injector control) - winding resistance (should be 12–15 Ohms).
  • 🔧 Contact 70 (knock sensor signal) - if there is a malfunction, the ECU lowers the ignition timing.
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If after replacing the ECU the engine does not start, check the compatibility of the firmware with the immobilizer. B Nissan Note until 2016 the system is used NAT, which requires “binding” the key to a new unit through diagnostic equipment (for example, Consult III+).

Connector B: diagnostics and communication with external devices

Connector B contains lines for communication with diagnostic equipment, as well as interfaces for flashing the ECU. Here are located:

  • 📡 K-Line (pin 1) - used for diagnostics with old scanners (for example, ELM327 v1.4).
  • 📡 CAN-H / CAN-L (pins 6 and 14) — high-speed bus for modern diagnostic devices.
  • 📡 Pin 16 — +12V power supply for the OBD-II diagnostic connector (check if there is no connection with the scanner).

To connect to CAN bus Polarity must be taken into account: CAN-H (high level) should be connected to pin 6, and CAN-L (low level) - to 14. Mixing up the lines leads to communication errors or damage to the ECU interface.

⚠️ Attention: In models Nissan Note 2017–2020 with the system ProPILOT Connector B has an additional pin 20 for communication with the adaptive cruise control module. When diagnosing via OBD-II, the scanner may not see this module if the adapter firmware is not updated.

Turn off the ignition and remove the key|Check the voltage on pin 16 (should be 12V)|Connect a scanner that supports the ISO 15765-4 protocol|Make sure there are no short circuits between CAN-H and CAN-L-->

Pinout features for engines with VVL system

In engines HR16DE with variable valve timing system (VVL) the pinout of connector A has additional contacts for controlling the VVL solenoids:

  • 🔄 Contact 35 — control of the intake camshaft solenoid.
  • 🔄 Contact 36 — control of the exhaust camshaft solenoid.
  • 🔄 Contact 75 — feedback from the VVL position sensor.

If the VVL system malfunctions, the ECU records errors P0011 or P0021. To check the solenoids:

  1. Measure the resistance between pins 35/36 and ground (should be 6-10 ohms).
  2. Check the voltage at pin 75 with the engine running (should vary in the range of 0.5–4.5V).
How to check VVL solenoids without diagnostic equipment?

Disconnect the solenoid connector and apply +12V to it from the battery. A working solenoid will make a clicking sound. If there is no click, the solenoid is faulty or there is an open circuit. Also check the winding resistance (normal: 6-10 ohms).

Pinout for automatic transmission (CVT)

In models with a variator (CVT) The ECU has an additional connector C, which connects the engine control unit with the transmission module. Key contacts:

Contact number Purpose Wire color
1 Vehicle speed signal (from ABS) Green
8 CVT Pressure Solenoid Control Red-black
12 Automatic transmission selector position signal Yellow-green

If you have problems with the variator (jerking, shift delays), first check:

  • 🔧 Pin 1 - if there is no speed signal, the ECU does not adjust the gear ratio.
  • 🔧 Contact 8 - if there is a break, the variator goes into emergency mode (an error is recorded P0746).
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B Nissan Note with CVT after 2018, an updated communication protocol is used between the ECU and the transmission module. Diagnostics requires a scanner with support J2534 (For example, VXDIAG VCX Nano).

Common mistakes when working with ECU pinouts

Even experienced auto electricians make mistakes when working with ECU connectors. Here are the most common:

  • ⚡ Ignoring connector locks - leads to broken contacts or short circuit.
  • ⚡ Checking live circuits - may damage the multimeter or the ECU (especially when checking the CAN bus).
  • ⚡ Using incompatible firmware - for example, firmware from Nissan Juke with the same engine HR16DE not suitable for Note due to different immobilizer calibrations.

To avoid problems:

  1. Always disconnect the battery before working with connectors.
  2. Use only original or certified diagnostic adapters (e.g. Consult III+ or MUT-III).
  3. Before flashing the ECU, keep the original calibration using WinOLS or ECUFlash.

FAQ: answers to popular questions

Can I use the pinout from the Nissan Micra for the Note?

Partially. Engines HR15DE/HR16DE in Micra K13 And Note E12 are identical, but the ECU connector may differ in the location of the contacts for the immobilizer and the CAN bus. Always check the wiring diagram for your specific model.

How to check the ECU power supply without diagnostic equipment?

Connect the multimeter in constant voltage mode between pin 1 (connector A) and ground (pin 30). When the ignition is off, there should be 12V (powered by the battery). With the ignition on, check pin 15 - also 12V.

What should I do if, after connecting the scanner, the ECU does not respond?

Check:

  1. Voltage at pin 16 of connector B (should be 12V).
  2. Integrity of CAN buses (resistance between CAN-H and CAN-L must be 60 Ohms).
  3. No immobilizer errors (if the scanner does not see the ECU, the unit may be blocked).
Where can I find original pinout diagrams for my model?

Official diagrams can be obtained:

  • In the manual Nissan EWD (Electrical Wiring Diagram) for your model (eg EWD560U2E for Note E12).
  • Via database Mitchell1 or AllData (paid access).
  • On the forums Nissan Club or Drive2 (search for topics by VIN code).