Inspection procedure 27: Engine oil pressure switch system

CIRCUIT OPERATION

• Battery voltage is applied to the engine oil pressure switch (terminal No. 1) from the ECM (terminal No. 36).
  

COMMENT

• Detect the engine oil pressure conditions and enter the result into the ECM. After starting the engine if the oil pressure rises to higher than the given pressure, the engine oil pressure switch turns OFF. Under this condition the ECM sends the command of turning off the oil warning lamp to the combination meter via CAN.
  

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

• Engine oil pressure switch failed.
  
• Open or shorted engine oil pressure switch circuit, harness damage, or connector damage.
  
• ECM failed.
  

	Go to Step 2.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then confirm that the malfunction symptom is eliminated.

(3)Measure the voltage between terminal No. 1 and ground. Voltage should be battery positive voltage. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is battery positive voltage (approximately 12 volts) present? Go to Step 5. Go to Step 3.

	Go to Step 4.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then confirm that the malfunction symptom is eliminated.

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then confirm that the malfunction symptom is eliminated.

	Repair it. Then confirm that the malfunction symptom is eliminated.

	Go to Step 6.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then confirm that the malfunction symptom is eliminated.

	Replace the engine oil pressure switch. Then confirm that the malfunction symptom is eliminated.

	Repair it. Then confirm that the malfunction symptom is eliminated.