TESTING
See Figure 1
This test should be performed if the oil pressure gauge does not show correct oil pressure and the cause is thought to be the sender.
-
Turn the ignition to the
ON
position (do not start the engine). Observe the oil pressure gauge.
- If the gauge reads L or below, proceed to Step 2.
- If the gauge reads anything but L or below, the problem lies in the wiring, the gauge itself or the instrument cluster.
Fig. Fig. 1: Oil pressure switch system wiring schematic-1993-96 models
- Disconnect the oil pressure switch/sender and short the lead to an engine ground.
REMOVAL & INSTALLATION
The sending unit is located as follows:
2.3L-Left rear of cylinder head
2.8L-Next to fuel pump
3.0L-In block behind right cylinder head
4.0L-Low left side of block near front
The pressure switch-type unit used with the indicator lamp system is not interchangeable with the variable resistance-type unit called a sender, which is used with the gauge system.
Installation of the wrong part will result in an inoperative oil pressure indicating system and a damaged switch unit or gauge.
- Disconnect the negative battery cable.
- Remove the inside engine cover.
- Disconnect the wire at the sending/switch unit.
- Remove the sending unit from the engine block.
- Wrap the threads of the new sending unit with Teflon® tape and carefully screw it into place. Make sure not to cross-thread the sending unit.
- Tighten the sending unit to 15 ft. lbs. (20 Nm).
- Attach the wire to the sending unit.
- Connect the negative battery cable.
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