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 MANUALSCHEVROLET1990LUMINA APV V6-191 3.1LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMTOOLS AND EQUIPMENTHIGH IMPEDANCE MULTIMETER
1990 Chevrolet Lumina APV V6-191 3.1L
High Impedance Multimeter
1990 Chevrolet Lumina APV V6-191 3.1LSECTION High Impedance Multimeter
High Impedance Multimeter:
DIGITAL VOLTMETER (DVM):
This High Impedance Multimeter measures Voltage, Resistance (ohms), and Current (amps). Use tool part number J 34029-A or equivalent. Refer to tool manufacturers' instructions for more information on the specific type of meter being used.
VOLTMETER:
Voltage position measures magnitude of voltage when connected in parallel to an existing circuit. A digital voltmeter with a 10 megohm input impedance is used because this type of meter will not load down the circuit and result in faulty readings. Some circuits require accurate low voltage readings because they have very high resistance. Refer to tool manufacturers' instructions for more information on the specific type of meter being used.
AMMETER:
When used as an ammeter, this meter accurately measures extremely low current flow. Refer to tool manufacturers' instructions for more information on the specific type of meter being used.
OHMMETER:
Measures resistance of circuit directly in ohms. Refer to tool manufacturers' instructions for more information on the specific type of meter being used.
RENDER: 1.0x
NO RELATED
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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.