Astro, "C", "K" & "S" Series & Safari

If gauge constantly reads "0" psi, go to next step. If gauge constantly reads "80" psi or above, go to step 4). If gauge reading is inaccurate, go to step 6).
Check oil level. Add oil if necessary. If gauge continues to indicate "0" psi, check for a grounded oil pressure gauge circuit by disconnecting lead at sending unit.
Oil pressure gauge should now read "80" psi. If gauge stays at "0" psi, disconnect lead from gauge. Oil pressure gauge should now read "80" psi. If correct, find short to ground between gauge and sending unit. If gauge reads "0" psi, replace gauge and test oil pressure gauge sending unit resistance. Refer to, in this article, OIL PRESSURE GAUGE SENDING UNIT RESISTANCE table. Replace sending unit if it reads one ohm with engine running.
If gauge reads "80" psi or above, check for an open circuit between gauge and sending unit by disconnecting lead at sending unit. Connect lead to ground and note reading on gauge.
If oil pressure gauge reads "0" psi, replace oil pressure gauge sending unit. If oil pressure gauge still reads "80" psi or beyond, find open wire between gauge and sending unit.
If gauge readings are inaccurate, disconnect lead from oil pressure sending unit. Connect Gauge Tester (J24538-A) to lead and ground. Turn ignition on. If gauge reads accurately, replace oil pressure sending unit. If gauge still reads inaccurately, replace oil pressure gauge.

OIL PRESSURE GAUGE SENDING UNIT RESISTANCE

Position

Ohms

Engine Off

Engine Running

⁽¹⁾ 44

⁽¹⁾	With oil pressure at about 40 psi (2.8 kg/cm² ).