Nissan Zexel Ecu Pinout [better]

Always cross-reference this baseline configuration with your specific vehicle’s factory service manual (FSM) wire colors before modifying harnesses. Functional Category Typical Pin Assignments Signal Type Target Component Pins 1, 2, 24 Battery Positive, Main Chassis Ground Throttle Input Pins 21, 22, 23 0.5V – 4.5V DC Accelerator Pedal Potentiometer Pump Feedback Pins 41, 42, 43 AC / Analog Control Sleeve Position Sensor (CSPS) Actuator Drive Pins 51, 52 PWM Ground Fuel Quantity Adjuster (QA Solenoid) Timing Control Timing Control Valve (TCV) Engine Speed Pins 15, 16 Sinusoidal AC Crankshaft Position Sensor (RPM) Thermal Inputs Variable DC Voltage Engine Coolant Temperature Sensor (ECT) Diagnostics Pins 11, 12 Digital Data K-Line / Consult Diagnostic Link Connector 4. Step-by-Step Back-Probing and Diagnostic Procedures

These pins are critical. A fault here will cause a "No Start" or prevent your OBD scan tool from communicating with the ECU. Pin Number Wire Color (Typical) Description Main Ground (Chassis) Connects to the engine block or fire wall Pin 2 Logic Ground Black / Pink Internal sensor shielding ground Pin 24 Permanent 12V Battery Red / White Constant power for ECU memory (Keep-Alive) Pin 25 Ignition Switch (ON/START) Black / White Triggers the main ECU internal relay Pin 38 Main Relay Output Power fed back from the engine room relay 2. Fuel Injection Control (Zexel Electronic Governor)

Isolated, low-noise grounds dedicated strictly to delicate sensors.

Pin 38 (or Pin 93) receives power when the key is in the "ON" position. ECM Relay Control: Pin 4 triggers the main power relay (Self-shutoff control). Critical Sensor Pinouts (Typical ZD30/TD27 Setup) nissan zexel ecu pinout

Wakes the ECU up when the key is turned to the "ON" position.

: Multiple pins dedicated to shielding and completing the electrical circuit back to the chassis. 2. Fuel Injection Pump Control (Zexel Covenc / VP37)

– Look for the sticker on the ECU casing containing the part number (e.g., 23710-XXXXX or 4079XX-XXX ). A fault here will cause a "No Start"

with the QD32ETi or TD27Ti engines Nissan Terrano II with the TD27Ti engine Why You Need the Pinout Diagram

Moisture ingress is the #1 killer of Zexel ECUs. The 48-pin connector terminals corrode, causing high resistance on the ground pins (A1 and B1).

Power delivered only when the key is in the 'ON' or 'START' position. Black/White Pin 38 (or Pin 93) receives power when

The complete, unsevered loom running directly from the ECU plugs to the Zexel injection pump. The Crankshaft Position Sensor (RPM input). The Accelerator Pedal assembly wires.

: Wiring a Zexel-controlled engine into a different chassis.