2001 Mazda B3000 Engine oil pressure on/off low or no press

  • 2001 MAZDA B3000
  • 6 CYL
  • 2WD
  • 84,000 MILES
I have Mazda pickup truck, manual 5 speed, 84,000 miles, I have a problem with my truck parked afew days and when I started engine the Gage check light is On and the pressure gage is sometime moved little bit or no pressure at on. I checked the oil in engine is full, I had to shut off and started on several time before check gage light off and oil pressure gage is normal.
The oil pressuresending unit is at passinger side on rear engine and it is very hard to pull the plug wire and remove oil pressure sending unit also,
Is some one know How to remove oil pressure sending unit on Mazda b3000, or have diagram of it, to see how does it look like. I need to hook up oil pressure gage on the port to see how many pressure psi on engine oil pump.
If I started engine every 12h a time. Engine was fine every thing is ok no gage check light, oil pressure is normal,
Any helps is aprecitiated.
Do you
have the same problem?
Sunday, September 27th, 2009 AT 4:25 PM

1 Reply


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


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
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Sunday, September 27th, 2009 AT 6:39 PM

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