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Checking The Oil Level Switch

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I have 86 venture and my low oil light keeps coming on. I keep checking it and it never changes. When the weather is warmer it does it less. Could the oil level switch be bad?

The switch uses a small float inside a cylinder that mounts on the bottom side of your crankcase near the oil drain plug. First check visually that there hasn't been any damage where something scraped/hit the sensor area and possibly damaged the wire. The switch is fastened into crankcase by 2 screws, requires draining of the crankcase to change.

The CMS (computor) feeds power down to the sensor....if the level is normal the switch closes to ground. If the level is low the switch opens to ground, the CMS alarms. So any wiring between CMS and switch must have good clean connections. Check them.

Ideally to solve this you need the alarm to stay on......if it does and the level is normal.....unhook the connector closest to switch......test the wire to the switch with ohmeter and touch other probe to ground....you should have small resistance (almost zero)....if you do switch is ok...if you have infinity (open) bad switch. Now test wire from CMS with VOLTMETER with key on you should have voltage from the CMS to the connector.....if you do, CMS is fine...if not....bad wiring further up or....CMS is bad. The CMS suffers from cracked solder joints that can cause false alarms due to continuity changes in various sensor circuits. If it is the CMS...check the tech library for repair procedure.
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Neil86

Last update: 08:12 PM Saturday, September 30, 2006

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