Nissan Platina 90-Terminal ECM Computer Repair Manual – Free Download

Nissan Platina ECM: The 90-pin ECM computer is responsible for managing the electronic fuel injection and ignition system of the Nissan Platina and equivalent Renault vehicles.

This module controls essential parameters for the correct functioning of the engine and offers multiple diagnostic options.

In this manual you will find electrical diagrams, terminal descriptions, multimeter and oscilloscope tests, as well as the location of sensors and actuators.

Read the Nissan Platina ECM manual before downloading it

Consult this technical manual online before downloading it. Review the electrical diagrams, sensor tests, and complete pinout to familiarize yourself with the content.

What functions does the 90-terminal ECM perform?

This electronic control module precisely regulates the air-fuel mixture, the ignition system, and coordinates the operation of key sensors such as the CKP, TPS, MAP, IAT, and ECT, among others. It is also responsible for activating and monitoring the injectors, ignition coils, and IAC valves.

Main components managed by the ECM

• Injectors 1 to 4
• Direct spark plug ignition coils
• Idle Air Control (IAC) valve
• CKP, TPS, MAP, IAT, ECT, O2 sensors
• Fan and fuel pump relays

Models and years compatible with this computer

This 90-pin ECM computer is installed in the following models:

• Nissan Platina – 1998 to 2004
• Renault Clio – 1998 to 2004
• Renault Kangoo – 1998 to 2004
• Renault Laguna – 1998 to 2004
• Renault Megane – 1998 to 2004

These vehicles use 1.4L and 1.6L engines, and are equipped with Siemens Sirius 32 ECM modules, renowned for their reliability and ease of diagnosis.

Nissan Platina ECM pinout and basic power supply

The ECM has a precise pinout. Some relevant pinouts are:

Location of sensors and ECM components Nissan Platina

The ECM controls and receives information from strategically located components in the vehicle. Some of these are:

• Crankshaft Position Sensor (CKP)
• MAP sensor (manifold absolute pressure)
• TPS sensor (throttle position sensor)
• IAT (air temperature) sensor
• ECT (engine temperature) sensor
• Oxygen sensor (HO2S 1 and 2)

Other supervised systems

• Vehicle speed
• Fuel pump relay
• CAN signals for automatic transmission
• Anti-start system

Specific tests with a multimeter

The manual provides detailed instructions for checking the computer's condition using simple measurements:

1. Food and land

• Terminal 30: constant battery voltage.
• Terminal 29: Power supply with switch in ON.
• Terminals 3, 28 and 33: The lands of the system must have good continuity.

2. Sensor signals

• CKP: 1.4 – 2 VDC at idle.
• GST: 0.2 – 0.9 VDC at rest, up to 4.5 VDC at full load.
• MAP: 0.8 – 1.8 VDC at idle.
• IAT: Reading between 4.5 and 5 VDC.
• HO2S: Oscillation between 100 mV and 1 V.

3. Activation of actuators

• Injectors: 53 V peak-to-peak (oscilloscope)
• Coils: 195 V peak-to-peak (oscilloscope)
• IAC: PWM signals according to engine RPM

Important notes and recommendations

• This ECM is highly sensitive to false ground contacts.
• Avoid replacing the module without first testing voltages and continuity.
• The module is compatible with OBD-II scanner diagnostics.
• Using tools like Check-22 facilitates functional testing.

More Recommended Resources for Car Repair

Download More Easy Mechanics Books and complete the entire collection for repairing ECU Automotive Computers.

We also recommend downloading the car workshop manuals, electrical diagrams and car parts catalogs to learn how to completely disassemble the car.

Automotive Computer Repair Equipment

For automotive computer repair, specialized tools are essential for troubleshooting and diagnosis. Below, we recommend the equipment and tools you should consider having in your workshop:

• Fuel Injection Simulator
• Professional Automotive Scanner
• Automotive Oscilloscope