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 MANUALSSATURN1998SL2 L4-1.9L DOHC VIN 7REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR TEMPERATURE SENSOR ( AMBIENT / INTAKE )DIAGRAMSDIAGNOSTIC AIDSGENERAL TROUBLESHOOTING PROCEDURESDIGITAL MULTIMETER USAGECONTINUITY/RESISTANCE/DIODE
1998 Saturn SL2 L4-1.9L DOHC VIN 7
Continuity/Resistance/Diode
1998 Saturn SL2 L4-1.9L DOHC VIN 7SECTION Continuity/Resistance/Diode
This group of settings on a multimeter allow you to accurately test for continuity and determine the resistance of many vehicle components.
Continuity
To check for continuity in a circuit use the lowest ohm scale available. Place the leads of the multimeter on each end of the circuit or component being tested. A reading of less than one ohm indicates acceptable continuity.
Resistance
To test for resistance values, place the leads of the multimeter on each side of the circuit or component being tested. Adjust the ohm settings on the multimeter until an acceptable reading is displayed. The lowest scale that gives a reading without going over the range (1 or OL) gives the most accurate reading. Compare the reading displayed on the multimeter to the specification found in the Multimeter Display Reading or bulletin. Verify that the scale reading on the multimeter is the same as in the specification (megohms, kilo-ohms or ohms). Multimeter Display Reading
NOTE: when using a multimeter on the ohmmeter or diode test scale, make sure the circuit or component is disconnected from a power source. Applying voltage to a multimeter when you are measuring resistance can damage the multimeter.
Diode Testing
Most digital multimeters have a Diode setting. This setting is used to test a diode to verify current flows in only one direction.
A good diode will display between 0.4 and 0.8 volt on the meter when the leads are forward biasing the diode, this indicates the diode is allowing current to flow in that direction. When the leads are reversed, the meter should read 1 or OL, indicating the diode is blocking the flow of current in the opposite direction. This indicates a good diode. If the diode allows current flow in both directions or prevents current flow in both directions, the diode is damaged and should be replaced.
Continuity
To check for continuity in a circuit use the lowest ohm scale available. Place the leads of the multimeter on each end of the circuit or component being tested. A reading of less than one ohm indicates acceptable continuity.
Resistance
To test for resistance values, place the leads of the multimeter on each side of the circuit or component being tested. Adjust the ohm settings on the multimeter until an acceptable reading is displayed. The lowest scale that gives a reading without going over the range (1 or OL) gives the most accurate reading. Compare the reading displayed on the multimeter to the specification found in the Multimeter Display Reading or bulletin. Verify that the scale reading on the multimeter is the same as in the specification (megohms, kilo-ohms or ohms). Multimeter Display Reading
NOTE: when using a multimeter on the ohmmeter or diode test scale, make sure the circuit or component is disconnected from a power source. Applying voltage to a multimeter when you are measuring resistance can damage the multimeter.
Diode Testing
Most digital multimeters have a Diode setting. This setting is used to test a diode to verify current flows in only one direction.
A good diode will display between 0.4 and 0.8 volt on the meter when the leads are forward biasing the diode, this indicates the diode is allowing current to flow in that direction. When the leads are reversed, the meter should read 1 or OL, indicating the diode is blocking the flow of current in the opposite direction. This indicates a good diode. If the diode allows current flow in both directions or prevents current flow in both directions, the diode is damaged and should be replaced.
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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.