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 MANUALSGMC1986VALUE VAN P2500, 7.4 W, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETUNE-UPIGNITION SYSTEM - HEI-EST (CALIF)TESTINGHALL EFFECT SWITCH TEST
1986 GMC Value Van P2500, 7.4 W, Standard
Hall Effect Switch Test
1986 GMC Value Van P2500, 7.4 W, StandardSECTION Hall Effect Switch Test
NOTE:
Hall Effect switches cannot be checked with an ohmmeter.
- Disconnect 3-wire connector at Hall Effect switch. Connect a 12-volt battery and voltmeter to switch terminals. See Fig 1. Carefully note polarity markings.
- Insert knife blade between magnet and Hall Effect switch. See Fig 1. Voltmeter should read within .5 volts of battery voltage. With knife blade removed voltmeter should read 0-.5 volts. If voltage readings are not as specified, replace Hall Effect switch.
RENDER: 1.0x
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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.