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 EQUIPMENTOHMMETER
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Ohmmeter
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Ohmmeter
An ohmmeter can be used instead of a self-powered test lamp. The ohmmeter shows how much resistance there is between two points along a circuit. LO resistance means good continuity.
Circuits which include any solid state control modules, such as the Electronic Control Module (ECM), should be tested only with a 10-megohm or higher impedance digital multimeter (J 34029-A, J 39200, or equivalent).
When measuring resistance with a digital multimeter, the vehicle battery should be disconnected. This will prevent incorrect readings.
Diodes and solid state components in a circuit can cause an ohmmeter to give a false reading. To find out if a component is affecting a measurement, take a reading once, reverse the leads, then take a second reading. If the readings differ, the solid state component is affecting the measurement.
Circuits which include any solid state control modules, such as the Electronic Control Module (ECM), should be tested only with a 10-megohm or higher impedance digital multimeter (J 34029-A, J 39200, or equivalent).
When measuring resistance with a digital multimeter, the vehicle battery should be disconnected. This will prevent incorrect readings.
Diodes and solid state components in a circuit can cause an ohmmeter to give a false reading. To find out if a component is affecting a measurement, take a reading once, reverse the leads, then take a second reading. If the readings differ, the solid state component is affecting the measurement.
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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.