Jumper wires (figure 6-6) are simple, effective testing aids. They are used to complete a circuit by allowing current to “jump” across a suspected open…
Current measurements are different from the other measurements made with a DVOM. Current measurements are made in series, unlike voltage or resistance measurements, which are…
The multimeter measures resistance by applying a test current to a circuit and measuring the voltage drop across the circuit. Resistance is measured in ohms…
Measuring voltage is usually the first step in testing a circuit. To test for voltage, the circuit being tested must be HOT, or receiving power.…
The following terms and symbols appear on the face of the Fluke 87 Digital Mutlimeter and are used in its operation. Their meanings are explained.…
A number of tools make diagnostics easier. They allow you to measure electrical activity on circuits and components that would otherwise be undetectable. Digital Volt-Ohmmeter…
The most valuable reference source is the Service Manual. For 1994, light duty trucks service manuals have been reorganized to make them easier to use.…
DATA LINK CONNECTOR (DLC) TERMINAL “B” — DIAGNOSTIC REQUEST When grounded to terminal “A”, terminal “B” allows the MIL to flash diagnostic trouble codes. DATA…
The Data Link Connector (DLC) is installed in the vehicle so a functional check of the engine’s electronic control system can be made at the…
The VSS signal is sent to a Vehicle Speed Sensor (VSS) Buffer Module (figure 5-57). The module acts as a signal interpreter. It changes the…