Oil Pressure Check

WARNING: This page is about a different car, the 2003 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Be careful not to burn yourself, as engine oil may be hot.
Oil pressure check should be done in "Neutral position" (M/T models) or "Parking position" (A/T models).

Check engine oil level. Refer to "ENGINE OIL ".
Remove undercover with power tool.
disconnect oil pressure switch harness connector.
Remove oil pressure switch.

Fig 1: Disconnecting Oil Pressure Switch Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.
Install pressure gauge (special service tool).
Start engine and warm it up to normal operating temperature.
Check oil pressure with engine running under no-load.

Fig 2: Engine Speed - Oil Pressure Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Installing Pressure Gauge (Special Service Tool)
Courtesy of NISSAN MOTOR CO., U.S.A.

If difference is extreme, check oil passage and oil pump for oil leaks.
After the inspections, install the oil pressure switch as follows:
1. Remove the old liquid gasket adhering to switch and engine.
2. Apply liquid gasket and tighten the oil pressure switch to specification.
  Use Genuine RTV Silicone Sealant or equivalent. Refer to , "RECOMMENDED CHEMICAL PRODUCTS AND SEALANTS ".
  1. 12.3 - 17.2 N.m (1.25 - 1.75 Kg-m, 9 - 12 ft-lb)