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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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NO.7 ENGINE OIL WARNING LIGHT ILLUMINATED/MESSAGE RELATED TO ENGINE HYDRAULIC PRESSURE MALFUNCTION INDICATED IN DISPLAY [SKYACTIV-G 2.0]

7	ENGINE OIL WARNING LIGHT ILLUMINATED/MESSAGE RELATED TO ENGINE HYDRAULIC PRESSURE MALFUNCTION INDICATED IN DISPLAY
DESCRIPTION	Engine oil warning light illuminated. Message related to engine hydraulic pressure malfunction indicated in display. (With center display)
POSSIBLE CAUSE	Engine oil leakage Improper engine oil level Oil pressure switch connector or terminals malfunction PCM connector or terminals malfunction Short to ground in wiring harness between oil pressure switch terminal A and PCM terminal 1P Open circuit in wiring harness between oil pressure switch terminal A and PCM terminal 1P Oil pump malfunction Oil pressure switch malfunction Instrument cluster malfunction PCM malfunction

Diagnostic Procedure

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT ENGINE OIL LEVEL Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [SKYACTIV-G 2.0].) Is there any malfunction?	Yes	Engine oil level is below L: Add genuine motor oil, then go to the next step. Engine oil level is above F: Replace the engine oil, then go to the next step. (penetration of fuel into engine oil can be considered) (See ENGINE OIL REPLACEMENT [SKYACTIV-G 2.0].)
		No	Go to Step 3.
2	VERIFY IF ENGINE OIL WARNING LIGHT ILLUMINATES Start the engine. Increase and keep the engine speed at 2,500 rpm for 5 s. Does the engine oil warning light illuminate?	Yes	Go to the next step.
		No	Symptom troubleshooting is completed.
3	VERIFY DTC Retrieve the PCM and instrument cluster DTCs using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].) (See DTC INSPECTION [INSTRUMENT CLUSTER].) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.0)].) (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
4	INSPECT OIL PRESSURE SWITCH CONNECTOR CONDITION Switch the ignition off. Disconnect the oil pressure switch connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals.
		No	Go to the next step.
5	INSPECT PCM CONNECTOR CONDITION Disconnect the PCM connector. Inspect for poor connection (such as damaged/pulled-out pins, corrosion). Is there any malfunction?	Yes	Repair or replace the connector and/or terminals.
		No	Go to the next step.
6	INSPECT OIL PRESSURE SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND Verify that the oil pressure switch and PCM connectors are disconnected. Inspect for continuity between oil pressure switch terminal A (wiring harness-side) and body ground. Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between oil pressure switch terminal A and PCM terminal 1P. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has a short to ground.
		No	Go to the next step.
7	INSPECT OIL PRESSURE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT Verify that the oil pressure switch and PCM connectors are disconnected. Inspect for continuity between oil pressure switch terminal A (wiring harness-side) and PCM terminal 1P (wiring harness-side). Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between oil pressure switch terminal A and PCM terminal 1P. If there is a common connector: Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. Repair or replace the malfunctioning part. If there is no common connector: Repair or replace the wiring harness which has an open circuit.
8	INSPECT ENGINE OIL PRESSURE Inspect the engine oil pressure. (See OIL PRESSURE INSPECTION [SKYACTIV-G 2.0].) Is there any malfunction?	Yes	Replace the oil pump, then go to the next step. (See OIL PUMP REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
		No	Replace the oil pressure switch, then go to the next step. (See ENGINE OIL SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)
9	Verify the test results. If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [SKYACTIV-G 2.0].) If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If the vehicle is repaired, troubleshooting is completed. If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.

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