Spirit L4-153 2.5L SOHC VIN K TBI (1993)
Oil Pressure Warning Lamp/Indicator: Testing and Inspection
Combination Oil Unit (2.5)
To test the system turn ignition key to the ON position. If the lamp fails to light, inspect for a broken or disconnected wire at the oil pressure combination
unit, which is located at the front of the engine.
Combination Oil Unit Test
If the wire at the connector checks good pull connector loose from the switch terminal and with a jumper wire ground connector to the engine. With the
ignition key turned to the ON position check the warning lamp. If lamp still fails to light, inspect for a burned out bulb or disconnected socket in the
cluster.
Combination Oil Unit Test
Combination Oil Unit Test
The combination oil unit has 2 functions:
1. The normal closed circuit keeps the oil pressure warning lamp on until there is oil pressure.
2. The sending provides a resistance that varies with oil pressure.
To test the normally closed oil lamp circuit, disconnect the locking connector and measure the resistance between the switch terminal and the metal
housing. The ohmmeter should read 0 ohms. Start the engine.
