The Zexel ECU derives tach signal from the crank sensor (A11). If your tach is dead but the engine runs, Pin B3 (Gray/Red) is likely open circuit or the internal transistor is dead.
Suspect: Fuel cut solenoid (E18 Pin 5 – Blue wire). Test: With key ON, check for 12V between E18 Pin 5 and chassis ground. If no voltage, trace back to the main relay (E18 Pin 1 – Black/White). If the main relay clicks but no 12V, replace the relay. If E18 Pin 5 has 12V but the engine won’t start, the solenoid itself is mechanically stuck.
To give you the exact pinout, please provide:
Would you like the diagnostic flash code list for the Zexel diesel ECU as well?
Nissan Zexel ECU (commonly found in diesel models like the Patrol, Terrano, and Navara with TD27, RD28, or ZD30 engines) manages the Electronic Fuel Injection (EFI) system. Because Zexel ECUs vary by vehicle year and market, always verify the specific part number on the ECU sticker before wiring. Core Power and Ground Terminals
Before testing sensors, ensure the main supply and ground circuits are intact. Main Ground:
Pin 39 (or Pin 108 on some models) connects directly to the chassis/engine block. Power Supply (+12V): Battery Feed: Pin 105 (Permanent power for memory). Ignition Feed:
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)
These pins carry 5V reference signals or varying analog voltages to the ECU. Component / Signal Typical Wire Color Engine Coolant Temp (ECT) Accelerator Pedal Position (APP) Vehicle Speed Signal (VSS) Mass Air Flow (MAF) Sensor Crankshaft Position (CKP) Signal & Ground Charge Air Pressure (Boost) Sensor 5V Sensor Power Supply Red or Orange Sensor Ground (Common) Black/Green Output Control and Actuators
These pins ground the circuit to activate solenoids or relays. Injection Pump Control Unit:
Pins 33, 40, and 53 manage timing and fuel quantity on VP44 Zexel pumps. Glow Plug Indicator: Pin 16 activates the dashboard light. Intake Air Control Valve: Pin 2 controls the solenoid. A/C Relay: Diagnostic and Programming (K-Line) For bench testing or reading fault codes: K-Line (Data): Pin 42 or Pin 88 is used for OBDII communication.
Required for some ECU flash tools; often requires a bridge to a specific point on the PCB to enable "Read/Write" modes.
Nissan Zexel ECU Pinout: A Comprehensive Guide
The Nissan Zexel ECU (Engine Control Unit) is a sophisticated computer system used in various Nissan vehicles to control engine performance, emissions, and diagnostics. For enthusiasts, mechanics, and tuners, understanding the ECU pinout is crucial for modifying, tuning, or troubleshooting the engine. In this article, we'll provide an in-depth look at the Nissan Zexel ECU pinout, its functions, and essential information for working with this system.
What is the Nissan Zexel ECU?
The Zexel ECU is a engine control unit developed by Zexel, a Japanese company that was acquired by Bosch in 1999. The Zexel ECU is used in various Nissan vehicles, including the 300ZX, 350Z, and Skyline models. This ECU is responsible for controlling engine functions such as fuel injection, ignition timing, and emissions.
Nissan Zexel ECU Pinout
The pinout of the Nissan Zexel ECU varies depending on the specific model and year of the vehicle. However, we'll provide a general overview of the common pinouts found in most Zexel ECUs.
Connector Pinout
The Zexel ECU typically has three main connectors: A, B, and C. Here's a breakdown of the pinout for each connector:
Connector A (14-pin)
| Pin # | Signal Name | Description | | --- | --- | --- | | 1 | BAT | Battery voltage | | 2 | GND | Ground | | 3 | IGN | Ignition switch | | 4 | ST | Starter signal | | 5 | FPD | Fuel pump driver | | 6 | INJ | Fuel injector signal | | 7 | IGT | Ignition timing signal | | 8 | CK | Crankshaft position sensor | | 9 | CMP | Camshaft position sensor | | 10 | TPS | Throttle position sensor | | 11 | MAP | Manifold absolute pressure sensor | | 12 | ECT | Engine coolant temperature sensor | | 13 | IAF | Intake air flow sensor | | 14 | GND | Ground |
Connector B (16-pin)
| Pin # | Signal Name | Description | | --- | --- | --- | | 1 | O2S | Oxygen sensor | | 2 | O2H | Oxygen sensor heater | | 3 | EGR | Exhaust gas recirculation valve | | 4 | PCV | Positive crankcase ventilation valve | | 5 | FLC | Fuel level sensor | | 6 | VSS | Vehicle speed sensor | | 7 | NSS | Neutral/park switch | | 8 | WLS | Wide open throttle switch | | 9 | ASL | Air conditioning switch | | 10 | FAN | Cooling fan control | | 11 | INJ | Fuel injector signal | | 12 | IGT | Ignition timing signal | | 13 | ST | Starter signal | | 14 | IGN | Ignition switch | | 15 | BAT | Battery voltage | | 16 | GND | Ground |
Connector C (10-pin)
| Pin # | Signal Name | Description | | --- | --- | --- | | 1 | DIAG | Diagnostic connector | | 2 | CANH | CAN bus high | | 3 | CANL | CAN bus low | | 4 | K-LINE | Communication line | | 5 | L-Line | Communication line | | 6 | VCC | Power supply | | 7 | GND | Ground | | 8 | N/C | Not connected | | 9 | N/C | Not connected | | 10 | GND | Ground |
Functions and Signals
The Nissan Zexel ECU pinout includes various signals and functions, such as:
Working with the Nissan Zexel ECU
When working with the Nissan Zexel ECU, it's essential to have a thorough understanding of the pinout and signal functions. Here are some tips:
Nissan Zexel ECU (commonly found in older diesel engines used in the Nissan Patrol Y61 Navara D22
) is a robust but complex unit primarily managing diesel fuel injection systems. Pinout documentation for these units is critical for troubleshooting engine performance, immobiliser bypasses, or sensor diagnostics. Core Pinout Breakdown (ZD30 Platform)
The Zexel ECU for the ZD30 engine typically uses a large multi-pin connector. Key terminals include: Power & Ground : Ignition Feed. : Main Ground. : ECM Relay (Self-Shut Off). Critical Engine Sensors : Mass Air Flow (MAF) Sensor. : Engine Coolant Temp (ECT) Sensor. Pin 44 & 47 : Crankshaft Position Sensor (+ and Ground). : Accelerator Pedal Position Sensor. Fuel Injection Control Pins 33, 40, & 53 : Injection Pump Control Unit communication. : Injection Pump Control Ground. Ancillary Controls : Glow Plug Indicator Lamp. : Engine Cooling Fan relay. : Anti-theft system (NATS) data line. Technical Review: Strengths & Weaknesses Review Sentiment Reliability
Generally high; built to withstand harsh diesel engine bay environments. Diagnostics
Standard OBDII (Pin 42) is available but often requires specialized Nissan diagnostic tools for deep-level data.
The NATS 5.6 immobiliser system is a common failure point. Services like are frequently used to read data or install emulators. Customization
Low compared to aftermarket options; enthusiasts often find it difficult to remap compared to modern Bosch units. Usage Tips for Mechanics Check by Part Number
: Do not search by vehicle name alone. Zexel ECUs vary significantly based on the specific ECU code/part number. Immobiliser Issues
: If the "Check Engine" lamp (Pin 18) flashes rapidly, it often indicates a NATS (Immobiliser) fault rather than a mechanical sensor issue. Harness Verification
: Always verify if the pin numbers provided are viewed from the harness side (where wires enter) or the terminal face to avoid damaging the unit. pin-to-wire colour code for a particular Nissan model like the Patrol or Navara?
The Nissan Zexel ECU (Engine Control Unit) is a critical management system found in various Nissan diesel vehicles, most notably the Nissan Patrol Y61 and Navara D22 equipped with engines like the ZD30, YD25, and TD27. Zexel, originally Diesel Kiki and now part of the Denso Corporation, produced these ECUs to precisely control rotary fuel injection pumps (such as the VP44) and optimize engine performance. Understanding the Zexel ECU Pinout
A pinout is a technical map of the electrical connections on the ECU's multi-pin plug. Each pin corresponds to a specific sensor input, actuator output, or power supply line. For the Zexel units found in Nissan diesel engines (particularly the ZD30DDTi), the wiring is complex due to the integration of fuel metering, timing, and security systems like NATS (Nissan Anti-Theft System). Core Pin Assignments (Example: ZD30 ECU)
While specific pinouts can vary by year and region, standard Zexel diesel ECUs for Nissan often feature the following primary connections: Pin Number Description 38 Ignition Feed Main switched power from the ignition switch. 39, 52 Ground (GND) Main chassis ground and injection pump control ground. 4 Control for the self-shut-off relay. 33, 40, 53 Injection Pump Control
Dedicated lines for the VP44 or similar fuel injection pump. 23 Accelerator Pedal
Input signal from the Accelerator Pedal Position (APP) sensor. 19 Coolant Temp Input from the Engine Coolant Temperature (ECT) sensor. 35 MAF Sensor nissan zexel ecu pinout
Input from the Mass Air Flow sensor for air intake measurement. 44, 47 Crankshaft Position Input and ground for the Crankshaft Position (CKP) sensor. 18 Check Engine Light
Output to the instrument cluster's Malfunction Indicator Lamp (MIL). 55 Anti-Theft (NATS) Data line for the immobilizer communication. Key Features and Functions
Fuel Injection Management: The ECU uses real-time data from sensors (like the oxygen, crankshaft, and temperature sensors) to adjust fuel quantity and injection timing.
Emission and Torque Control: It supports multiple injection strategies (pilot, main, and post-injection) to meet emissions standards and reduce engine noise and vibration.
Adaptive Learning: These units store operational data to adjust engine behavior based on component wear and driving patterns.
NATS Immobilizer: Many Zexel ECUs (like the VK560 or VC602 models) are paired with the NATS 5.6 system. If the data in the internal EEPROM (often a 24C02 or 93C66 chip) becomes corrupted, the vehicle may fail to start. Practical Maintenance and Troubleshooting Zexel ECU tuning - ecuconnections
Nissan Zexel ECU Pinout: A Comprehensive Guide
The Nissan Zexel ECU (Engine Control Unit) is a sophisticated computer system used in various Nissan vehicles to control engine performance, emissions, and diagnostics. For enthusiasts, tuners, and repair professionals, understanding the ECU pinout is crucial for modifying, troubleshooting, or upgrading the engine management system. This write-up provides an in-depth look at the Nissan Zexel ECU pinout, its functions, and applications.
Overview of Zexel ECU
The Zexel ECU is a product of Zexel, a company that was acquired by Nissan in 1999. Zexel ECUs are known for their advanced engine management capabilities, including fuel injection, ignition timing, and emissions control. The ECU processes data from various sensors, such as crankshaft position, camshaft position, throttle position, and coolant temperature, to optimize engine performance.
Pinout Configuration
The pinout configuration of the Nissan Zexel ECU varies depending on the specific vehicle application and ECU version. However, most Zexel ECUs have a standard 64-pin or 80-pin connector. The following sections outline the common pinout configuration for Zexel ECUs:
64-Pin Connector Pinout
| Pin # | Signal Name | Description | | --- | --- | --- | | 1-4 | Power Supply | Battery voltage, ignition switch, and ground | | 5-8 | Sensor Inputs | Crankshaft position, camshaft position, throttle position, and coolant temperature | | 9-12 | Fuel Injector Outputs | Fuel injector control for cylinders 1-4 | | 13-16 | Ignition Outputs | Ignition coil control for cylinders 1-4 | | 17-20 | Diagnostic Outputs | Diagnostic trouble code (DTC) output, MIL control |
80-Pin Connector Pinout
| Pin # | Signal Name | Description | | --- | --- | --- | | 1-8 | Analog Inputs | Oxygen sensor, airflow meter, and fuel pressure sensor | | 9-16 | Digital Inputs | Vehicle speed sensor, brake switch, and clutch switch | | 17-24 | Output Drivers | Fuel pump, radiator fan, and AC compressor | | 25-32 | Injector Outputs | Fuel injector control for cylinders 1-6 |
Functions and Applications
The Nissan Zexel ECU pinout plays a critical role in various engine management functions, including:
Conclusion
The Nissan Zexel ECU pinout is a complex and critical component of the engine management system. Understanding the pinout configuration and functions of the ECU is essential for modifying, troubleshooting, or upgrading the engine management system. This write-up provides a comprehensive guide to the Zexel ECU pinout, enabling enthusiasts, tuners, and repair professionals to work with confidence on Nissan vehicles equipped with this ECU.
The Nissan Zexel Engine Control Unit (ECU) is commonly found in diesel models like the Nissan Patrol Y61 and
equipped with the ZD30 engine. Understanding its pinout is crucial for diagnostics, performance tuning, and engine swaps. Overview of the Zexel ECU (ZD30 Engine) The Zexel ECU derives tach signal from the
The Zexel ECU manages the Bosch VP44 fuel injection pump (manufactured under license by Zexel). It utilizes a high-pin-count connector to interface with various engine sensors and actuators to maintain optimal performance and emissions. Primary Pin Functions
While specific wire colors can vary by production year and region, the core pinout for the Nissan ZD30 Zexel ECU generally includes: Power & Ground:
Main Power (+12V): Typically connected to pins that receive battery voltage when the ignition is on.
Ground: Multiple pins are dedicated to grounding the unit to ensure stable signal processing. Sensor Inputs:
Mass Air Flow (MAF): Monitors the volume of air entering the engine.
Engine Coolant Temperature (ECT): Essential for cold-start and cooling fan control.
Accelerator Pedal Position (APP): Provides the driver's throttle demand to the ECU.
Crankshaft/Camshaft Position: Used to synchronize injection timing. Actuator Controls:
Fuel Injection Pump (VP44): Complex communication pins that control timing and fuel quantity.
EGR Valve Control: Manages Exhaust Gas Recirculation for emissions control. Glow Plug Relay: Activates pre-heating for diesel ignition. Diagnostic and Programming Access
For those looking to reflash or read the ECU data, specific "boot pins" and communication lines must be identified:
K-Line: Used for standard OBD-II diagnostics and basic flashing.
Boot Mode: Some versions require a specific pin to be grounded or bridged (often through a resistor like 680 Ohm) to enter a state where the memory can be written.
Resources: Detailed schematics and technical reference guides are often found on specialty forums like NefariousMotorsports or through Scribd's ZD30 Pinout documents. Safety and Testing Precautions
Verification: Always cross-reference your ECU’s part number with the diagram, as using an incorrect pinout can lead to permanent hardware damage.
Resetting: If you need to reset the ECU without specialized tools, you can often perform a "pedal dance" (specific ignition and accelerator pedal sequences) to clear adaptive learning or basic error codes.
Nissan Zexel ECU (Electronic Control Unit) was commonly used in diesel Nissan models like the Patrol (Y61)
engine. Because pinouts vary significantly between production years and specific Zexel hardware revisions (such as the MSA15), always verify your specific ECU part number before making permanent wiring changes. 1. Universal Connector Identification
Most Zexel ECUs utilize a multi-connector system (often labeled A, B, and C). You can typically identify the main power and communication pins by their wire gauge or color patterns on the harness. 2. Common Critical Pin Assignments The following pinout is common for many Nissan ZD30 Zexel ECUs Power and Ground +12V Switched (Ignition): Often located on Pin 1 or Pin 114 (Connector dependent). +12V Permanent (Battery): Commonly Pins 27 or 32. Ground (Chassis): Commonly Pins 1, 2, or 10. Engine Sensors & Controls Accelerator Pedal Position: Connects to the pedal potentiometer. Crankshaft/Camshaft Position Sensors: Essential for timing and starting. Fuel Injectors: Specific high-voltage pins assigned to each cylinder. Throttle Control Motor: Regulates airflow and idle. Diagnostics & Communication K-Line (ISO 9141):
Used for OBD-II communication and scanning; often identified by a green wire. 3. Safe Wiring & Modification Steps
To safely work with your Zexel ECU, follow this standard procedure: Nissan ECU Pinout Connection Guide | PDF - Scribd
Sam first cleaned the connector and noted the number of pins and shell shape, then photographed the connector from multiple angles. They labelled the pins A1–A?, B1–B?, according to rows and columns, because Zexel housings varied by model year. Sam knew three rules would guide the hunt: Would you like the diagnostic flash code list
This is the most requested pinout, typically found on engines like the Nissan FD46T.