Combination Oil Sending Unit

With engine off, disconnect combination oil sending unit locking connector. See Fig 1 and Fig 2 . To check low oil pressure warning light circuit, measure resistance between switch (light) terminal and metal housing of sending unit. See Fig 3 . There should be less than 0 (zero) ohms.
Start engine. There should be between an open circuit (C, L and Y bodies) or 30-55 ohms (all others), depending on engine speed, oil temperature, and oil viscosity. If reading is not within specification, replace sending unit.

Fig 1: Combination Oil Sending Unit (2.2L & 2.5L)

Courtesy of CHRYSLER MOTORS.

Fig 2: Combination Oil Sending Unit (3.0L & 3.3L)

Courtesy of CHRYSLER MOTORS.

Fig 3: Combination Oil Sending Unit Terminal Identification

Courtesy of CHRYSLER MOTORS.