The Nissan Zexel ECU is primarily found in diesel models equipped with the ZD30 and QD32 engines. These units are common in utility vehicles like the Nissan Patrol (Y61), Navara/Frontier (D22), and Terrano (R20). Key Pinout Functions (ZD30 Engine)
64-Pin Connector Pinout
On TD42T engines, the Zexel ECU uses a 3-bar MAP sensor (often located on the firewall). The signal should read ~1.5V at idle and climb to +3.5V under full boost (12-15 psi). No boost signal forces the ECU to default to retarded timing, killing power and fuel economy. nissan zexel ecu pinout
This is the most common failure point. When the ECU sees a crank signal, it sends +12V to the spill control valve on the injection pump. No voltage = No fuel = No start.
Would you like the diagnostic flash code list for the Zexel diesel ECU as well? The Nissan Zexel ECU is primarily found in
| Pin | Wire Color | Signal Name | Description | Spec | | :--- | :--- | :--- | :--- | :--- | | 1 | B/W (Black/White) | Main Relay Control | Activates ECU power relay | Switched ground (12V coil) | | 2 | Lg/W (Lt Grn/White) | Check Engine Lamp (MIL) | To combination meter | Ground to illuminate | | 3 | W (White) | Tachometer Signal | Engine RPM to cluster | 12V square wave | | 4 | G/Y (Green/Yellow) | Injection Timing Control Valve | Regulates hydraulic timing advance | PWM duty cycle (10-90%) | | 5 | L (Blue) | Fuel Cut Solenoid (Stop Solenoid) | Shuts off fuel pump | 12V run / 0V stop | | 6 | B (Black) | Power Ground | High-current ground for drivers | 0V | | 7 | N/C | Not Connected | – | – | | 8 | R (Red) | Battery Backup (Constant 12V) | For ECU memory & clock | 10-14V (always live) | | 9 | B (Black) | Power Ground | Same as Pin 6 | 0V | | 10 | Br (Brown) | Glow Plug Relay Control | Activates glow timer | Ground to engage relay | | 11 | G (Green) | EGR Solenoid Control (if equipped) | Exhaust gas recirculation | 12V PWM | | 12 | L/W (Blue/White) | Cold Start Advance | Solenoid on pump for cold idle | 12V when coolant < 60°C | | 13 | Y (Yellow) | Feedback Fuel Temperature | Fuel temp sensor input | 0-5V | | 14 | P (Pink) | Injection Pump Cam Sensor | Pump position verification | 5V pulse | | 15 | B/R (Black/Red) | Ignition Switch Signal (IG ON) | Main ECU wake-up | 12V with key ON | | 16 | Gr (Gray) | Alternator L-Terminal | Load detection for idle up | 12V when charging | | 17 | Or (Orange) | Data Link Connector (K-Line) | Diagnostic communication (Nissan Consult) | 0-12V variable | | 18 | B/W (Black/White) | Power Ground 3 | Final ground to engine block | 0V |
Output to the instrument cluster's Malfunction Indicator Lamp (MIL). 55 Anti-Theft (NATS) Data line for the immobilizer communication. Key Features and Functions Boost Pressure Sensor (Pin A9 – Yellow/Blue) On
Overview of the Nissan Zexel ECU
Tips and Precautions