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Low Oil Pressure Indicator Inoperative

NOTE: After making any repairs, perform BODY VERIFICATION TEST  under VERIFICATION TESTS.
  1. Turn the ignition off. Perform the instrument cluster self test. Depress and hold the trip odometer reset button while turning the ignition on. If the low oil pressure indicator illuminated go to next step. If the low oil pressure indicator did not illuminate, go to step  4 .
  2. Turn the ignition on. With the DRBIII in SENSORS, read the oil pressure switch state. Disconnect the engine oil pressure switch harness connector. With the DRBIII in SENSORS, read the oil pressure switch state. If the engine oil pressure switch changed states, replace the engine oil pressure switch. If the engine oil pressure switch did not change state, go to next step.
  3. Turn the ignition off. Disconnect the engine oil pressure switch harness connector. Disconnect the PCM (C1 connector) harness connector. Measure the resistance of the engine oil pressure switch sense circuit. If the resistance is less than 5.0 ohms, replace the powertrain control module. See POWERTRAIN CONTROL MODULE  . If the resistance is more than 5.0 ohms, repair the engine oil pressure switch sense circuit for an open.
  4. Turn the ignition off. Remove the instrument cluster. Remove the low oil pressure indicator LED. Using a DVOM, select DIODE MODE, and attach the leads across the LED. Ensure that the Red lead is on the positive of the LED. If the LED illuminated, replace the instrument cluster. See INSTRUMENT CLUSTER under REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS article. If the LED did not illuminate, replace the low oil pressure indicator LED. See INSTRUMENT CLUSTER BULBS & LEDS under REMOVAL & INSTALLATION in ANALOG INSTRUMENT PANELS article.
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