See Figure 1
- Disconnect the oil pressure gauge unit electrical connector.
- Use a suitable test light (12V-3.4W) to ground the harness side connector.
- Turn the ignition to the ON position.
- Check the condition of the test light and gauge as follows:
- If all components are operating properly, the test light will flash or light steadily and the oil pressure gauge needle will move.
- If the test light flashes or lights steadily and but the gauge does not move, the gauge must be replaced.
- If neither the test light or the gauge operated, check the oil pressure gauge circuit and replace, if necessary.
- Remove the electrical harness connector from the switch and remove the switch from the oil filter head.
- Connect an ohmmeter between the terminal and the sensor body cavity and check for conductivity. If there is no conductivity, replace the switch.
- Next, insert a very thin wedge through the oil hole in the end of the sensor. Push the wedge in slightly and measure resistance. There should be no conductivity.
- If there is conductivity, even when wedge is pushed, replace the switch.
- If there is no conductivity when a 71 psi pressure is placed through the oil hole, the switch is operating properly.
- Check to see that there is no air pressure leakage through the switch. If there is air pressure leakage, the diaphragm is broken and the switch will require replacement.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Raise and support the vehicle safely.
- Detach the electrical harness connector from the switch, then remove the unit from the oil filter head.
- Apply a thin bead of sealant to the threaded portion of the oil pressure sensor. Do not allow sealer to contact the end of the threaded portion of the sensor.
- Install the sensor and tighten to 8 ft. lbs. (12 Nm). Do not overtighten the sensor.
- Attach the electrical harness connector to the sensor.
- Carefully lower the vehicle, then connect the negative battery cable.