Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDIAGRAMSDIAGNOSTIC AIDSGENERAL TROUBLESHOOTING PROCEDURESELECTRICAL TEST EQUIPMENTTEST LAMP/VOLTMETER
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Test Lamp/Voltmeter
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Test Lamp/Voltmeter
Use a test lamp to check for voltage. A Test Lamp (J 34142-B or equivalent) is made up of a 12-Volt light bulb with a pair of leads attached to grounding one lead, touch the other lead to various points along the circuit where voltage should be present. When the bulb goes ON, there is voltage at the point being tested.
A voltmeter can be used instead of a test lamp. While a test lamp shows whether or not voltage is present, a voltmeter indicates how much voltage is present.
An increasing number of circuits include solid state control modules. One example is the Electronic Control Module (ECM). Voltages in these circuits should be tested only with a 1O-megohm or higher impedance digital voltmeter or multi-meter (J 34029-A, J 39200 or equivalent.) Never use a test lamp on circuits that contain solid state components, since damage to these components may result.
When testing for voltage or continuity at a connection, you do not have to separate the two halves of the connector. Unless you are testing a "weather-pack" connector, you should probe the connector from the back. Always check both sides of the connector. An accumulation of dirt and corrosion between contact surfaces is sometimes a cause of electrical problems.
A voltmeter can be used instead of a test lamp. While a test lamp shows whether or not voltage is present, a voltmeter indicates how much voltage is present.
An increasing number of circuits include solid state control modules. One example is the Electronic Control Module (ECM). Voltages in these circuits should be tested only with a 1O-megohm or higher impedance digital voltmeter or multi-meter (J 34029-A, J 39200 or equivalent.) Never use a test lamp on circuits that contain solid state components, since damage to these components may result.
When testing for voltage or continuity at a connection, you do not have to separate the two halves of the connector. Unless you are testing a "weather-pack" connector, you should probe the connector from the back. Always check both sides of the connector. An accumulation of dirt and corrosion between contact surfaces is sometimes a cause of electrical problems.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.