Table of contents: Use of diagnostic equipment ↓ Preliminary checks ↓
The secondary circuit of the electronic ignition system can generate dangerously high voltage. For this reason, special precautions must be taken when working on or near ignition system components.
Do not start the engine unless you are sure that the battery terminals are clean and securely fastened.
Do not use a battery charger to jump start your vehicle.
Before disconnecting the wires from the battery (or connect them) don't forget to turn off the ignition (key in OFF position).
Before servicing engine management system components, always disconnect the negative battery cable.
Before starting welding, be sure to disconnect the wires from the battery, and do not forget to disconnect the electrical connector of the control unit (ECU).
Do not allow the ECU to heat up above 80°C.
Make sure all electrical connections are clean and secure.
Before disconnecting any of the components of the engine control system, be sure to turn off the ignition (OFF).
Always relieve pressure in the system before removing any fuel system feed components. Remember that the system is under pressure at all times (even with the engine off).
Information copied from the website: Nissanbook.ru
Do not allow water to splash or spray onto engine management system components while cleaning the engine.
Exercise caution when handling all components of the engine management system, especially the lambda probe.
Do not attempt to disassemble electronic components. If they fail, replace them in blocks.
Do not apply battery voltage directly to the fuel injectors.
Use of diagnostic equipment
Universal meter of electrical circuit parameters (multimeter)
When checking voltage or resistance in circuits, use only a digital multimeter with an impedance of at least 10 megohms.
All measurements should be made with the electrical connectors of the components connected, unless otherwise specified in the test instructions. The measuring probe of the device is inserted into the connector from the back side. If the probes are not thin enough, they can be improved by attaching a piece of wire to their end, thin enough not to damage the corresponding connector. Ensure reliable electrical and mechanical contact of the wire with the probe.
If you removed the sealing cap or protective cover from the connector to perform the test, be sure to reinstall it.
Test lamp
Use test lamps only where specified in the instructions. To avoid damage to electronic components, use only test lamps with a power of 3.6 W or less.
To check the lamp power, use an accurate ammeter (for example, a digital multimeter) - when the meter is connected in series with the lamp and at a supply voltage of 12 V, the reading should not exceed 0.3 A (300 mA).
If you don't have a suitable test lamp at hand, make one from an LED.
Note: When using a LED as a signal element of the test lamp, remember that the latter, by definition, only passes current in one direction. That is, the lamp's measuring probe must be connected to the positive side of the component being probed.
Preliminary checks
Note: Before attempting to troubleshoot the engine management system itself, perform the following checks.
1. Check that there is fuel in the gas tank.
2. Check the condition and reliability of the contacts of all electrical connectors and ground terminals of the engine management system components.
3. Check the battery status. Make any necessary corrections.
4. Check the condition of the air cleaner filter element. Replace if necessary.
5. Check the fuel pressure.
6. Check the mechanical condition of the engine and the correctness of its settings.
7. Check the condition and reliability of all vacuum hoses.
8. Check for air leaks/vacuum losses through the intake manifold, throttle body and air plenum chamber.
9. Check the proper functioning of the crankcase ventilation (PCV) system.
10. Check the coolant level and make sure the engine is at normal operating temperature.