Found in early Navara and Pathfinder variants. π Standard Zexel ECU Pinout Architecture
Keeps the ECU memory alive when the ignition is off.
Understanding the is essential for diagnosing engine issues, performing performance tuning, or bypassing immobilizer systems on classic Nissan diesel models. Zexel ECUs are sophisticated fuel injection control units primarily used in diesel engines to optimize performance, fuel efficiency, and emissions. Overview of Zexel ECUs in Nissan Vehicles
Comprehensive Guide to Nissan Zexel ECU Pinouts: Mapping the Electronic Fuel Injection System nissan zexel ecu pinout
Zexel ECUs are predominantly found in Nissanβs robust commercial and off-road diesel lineups.
These inputs allow the microcontrollers to calculate real-time load, temperature, and atmospheric conditions.
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| Pin | Wire Color | Signal Name | Description | Voltage/Spec | | :--- | :--- | :--- | :--- | :--- | | 1 | Lg (Light Green) | TPS Signal 1 | Throttle position sensor main (0-5V) | 0.45V idle / 4.5V WOT | | 2 | Lg/R (Lt Grn/Red) | TPS Signal 2 | Redundant TPS for safety check | Opposite slope of Pin 1 | | 3 | B (Black) | Sensor Ground | Ground for all analog sensors | 0V (chassis) | | 4 | W (White) | Pump TDC Sensor (G) | Top dead center reference for injection | 5V pulse (tooth signal) | | 5 | B/W (Black/White) | Boost Pressure Sensor Signal | Manifold absolute pressure (MAP) | 0.5V (vac) to 4.5V (20psi) | | 6 | Y (Yellow) | Engine Coolant Temp (ECT) | Variable resistance to ground | 2.5V cold / 0.5V hot | | 7 | N/C | Not Connected | β | β | | 8 | R (Red) | +5V Sensor Reference | Powers TPS, MAP, ECT | 5.0V Β±0.1V | | 9 | B/P (Black/Pink) | Shield Ground | Drain wire for shielded cables | Chassis ground | | 10 | Or (Orange) | Crank Position Sensor (Ne) | Engine speed & timing | AC sine wave (0.5-5V running) | | 11 | G/B (Green/Black) | Vehicle Speed Sensor (VSS) | From speedometer head | 0-12V square wave | | 12 | Br (Brown) | Intake Air Temp (IAT) | In intake manifold | 2.5V cold / 0.5V hot | | 13 | N/C | Not Connected | β | β | | 14 | W/L (White/Blue) | Accelerator Pedal Full Switch | Idle validation switch | 12V at idle / 0V off idle | | 15 | Lg/B (Lt Grn/Black) | Neutral Position Switch (MT) | Manual trans neutral signal | 0V in neutral / 12V in gear | | 16 | P (Pink) | Clutch Switch Signal | For idle-up on clutch engagement | 12V at rest / 0V depressed | | 17 | Sb (Sky Blue) | Air Conditioner Request | A/C compressor on signal | 12V when A/C ON |
Before testing sensors, ensure the main supply and ground circuits are intact. Main Ground:
This comprehensive guide breaks down the architecture of Nissan Zexel ECUs, provides standard pinout configurations, and explains how to safely probe these modules. What is a Nissan Zexel ECU? Zexel ECUs are sophisticated fuel injection control units
Matching the Zexel harness to a different chassis requires splicing critical power, ground, and ignition wires.
| Pin | Wire Color | Signal Name | Description | | :--- | :--- | :--- | :--- | | 1 | R (Red) | Battery +12V (Direct) | Main power supply for injector drivers | | 2 | B (Black) | Ground (Engine block) | Heavy ground for output drivers | | 3 | B/R (Black/Red) | Ignition Relay Output | 12V switched after main relay | | 4 | β | Not Used | β | | 5 | Y (Yellow) | Starter Signal (ST) | 12V while cranking | | 6 β 14 | Various | Reserved for ABS/TCS signals on automatic models | Refer to vehicle-specific supplement |
: Because Zexel ECUs vary by year and region, it is essential to identify the Manufacturer P/N (e.g., 407917-xxx) or the Nissan Part Number (e.g., 23710-xxxxx) before attempting a pinout swap.
Heavy-gauge wires grounding the ECU casing and internal power transistors directly to the vehicle chassis. 2. Primary Engine Inputs (Sensors)
To safely work with these pins, users typically use specialized hardware like the KESS3 for reading and writing data in "boot mode," which bypasses standard diagnostic restrictions.