Issues should be addressed while using a multimeter to evaluate the engine's electrical control system
(1) Unless otherwise stated during the test, high-impedance digital multimeters should be used to test computers and sensors instead of pointer multimeters. The multimeter's internal resistance should not be less than 1 OK.
(2) After troubleshooting these areas, check the quality of fuses, fusible connections, and terminals before conducting a multimeter test.
(3) The battery voltage shouldn't be less than 11V while measuring the voltage, and the ignition switch should be switched on (ON).
(4) Carefully remove the leather cover before using a multimeter to investigate the waterproof connector. When inserting the test pen into the connector for inspection, take care not to press down too hard on the terminal. The test lead can be inserted during testing either from the front without wire or from the back with wiring.
(5) To increase accuracy when measuring resistance, carefully shake the wire both vertically and horizontally.
(6) To evaluate whether there is an open circuit or a contact failure while examining a line open circuit problem, first unplug the connector for the computer and the appropriate sensor. Then, measure the resistance between the respective terminals of the connector.
(7) The connections at both ends of the line should be taken apart in order to check for a ground short circuit issue. Next, the resistance between the tested terminal of the connector and the body (ground) should be measured. Over 1M of resistance is considered to be fault-free.
(8) The power supply must be shut off first, which entails turning the ignition switch off and removing the wiring from the battery pole pile, in order to disassemble the engine's electronic control system circuit.
(9) Depending on the model, the grounding terminal's connector sign may vary; to identify it, consult the maintenance handbook.
(10) The two test leads of the multimeter (voltage file) should be in touch with the two terminals or two wires being measured when gauging the voltage between them.
(11) The positive test lead of the multimeter should be in contact with the terminal or line being tested, and the multimeter's negative test lead should be in contact with the ground wire for measuring the voltage of a particular terminal or line.
(12) Measuring the resistance value of the multimeter resistance file can be used to check the continuity of terminals, contacts, or wires, which refers to determining whether the terminals, contacts, or wires are energized and not disconnected.
(13) When measuring resistance or voltage, it is typically necessary to disassemble the connector. The connector is then split into two parts: a sensor (or executive component) connector and a sensor (or actuating part) wire harness connector. On one side of the wire harness, the sensor (or actuating part) connector is also known as a connector sleeve. One portion is referred to as the injector connector, for instance, and the other is referred to as the injector harness connector or the injector connector on the wire side after the connector on the injector has been removed. It should be obvious which connector component you are monitoring.
(14) The computer is wired to the executive components, and the computer is wired to all sensors, relays, and other devices. As a result, any faults may be tested on the relevant terminal of the computer connector.
