2001 Mazda b3000 Engine oil pressure on/off low or no press

Location: 2.3L/2.5L engines-Left side rear of the engine, in the cylinder head

it does not cost more than $10. Removal & Installation 1.Disconnect the negative battery cable. 2.Disconnect the wiring at the sender/switch. 3.Remove the oil pressure sender/switch from the engine To install: 1.Coat the threads with electrically conductive sealer and thread the unit into place. Tighten the sender/switch to 10-13 ft. lbs (13-17 Nm). 2.Attach the wiring to the sender/switch and connect the negative battery cable Testing 1 To test the oil pressure switch, open the hood and locate the switch. 2 Disconnect the wire from the switch. Attach one end of a jumper wire to the terminal on the end of the wire, then touch the other end of the jumper wire to a good engine ground (any bare metal engine surface). Have an assistant observe the instrument gauge cluster while you do this and tell you if the low oil warning lamp illuminates or not; the low oil warning lamp should illuminate. a .If the lamp does not illuminate, skip to Step 3. b .If the lamp does illuminate, replace the switch with a new one. 3 .Before jumping to any bad conclusions, try a different area for grounding the jumper wire on the engine. If the lamp still does not illuminate, touch the jumper wire end to the negative (-) battery post. a .If the lamp illuminates, the problem lies with the engine not being properly grounded. b.If the lamp does not illuminate, skip to Step 4. 4.Connect the original wire to the oil pressure switch. While sitting in the vehicle, turn the ignition switch to the ON position without actually starting the engine. Observe the other lights on the instrument cluster a.If all of the other lights illuminate when turning the ignition switch ON , the oil pressure switch is defective and must be replaced. b.If none of the other lights illuminate, there is a problem with power supply to the instrument cluster and gauges please feel free to write to me if you have questions