2000 1500 Dodge Ram, 5.2L
Oil pressure has remained relatively close to mid range 40 psi on gage regardless of engine temp and engine rpm speed. However, after an oil and filter change using same product for several years (Castrol Synthetic 10w30 with Frame P16 Filter) during cold start oil pressure rises to mid range 40 psi, holds for a moment, and then jumps up into the high end of normal range. After 5 to 10 min warm up the pressure gradually drops back into mid range 40 psi. At speed, oil pressure again will rise to high end normal when heavy on the pedal than settles back close to mid range 40 psi and when slowing or coasting, pressure will fall significantly below the 40 psi mid range. Thinking I possibly had a defective oil filter I replaced the filter with a high end brand that resulted in no change of symptoms. Also noted there was little oil spillage as if there was a restriction of oil getting to the filter so I?m reluctant to think this a defective pressure sending unit. Could symptoms be the result of a restricted pick-up screen or deposits clogging oil passages or possible bad oil pump bypass valve?
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NO , there is not a fuse just for those two thing's ! There are two power supply's for the whole insturment cluster . You could need a new cluster or the ECM isn't sending this info. to the cluster . Could have DTC'S - diagnostic trouble codes stored in the PCM or the insturment cluster . Without knowing how this works (insturment cluster gets it's info.) Your best bet , take it to a qualified repair shop that has the knowledge and test equipment to diagnose this problem.
Engine Oil Pressure Gage
The instrument panel cluster (IPC) displays the engine oil pressure as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine oil pressure. The engine oil pressure gage defaults to 0 psi (0 kPa) or below if:
• The ECM detects a malfunction in the engine oil pressure sensor circuit.
• The IPC detects a loss of serial data communications with the ECM.
For the 4.2L LL8, the ECM uses an engine oil switch that is open when the oil pressure is normal and closed when the oil pressure is low. At normal pressure, the engine oil pressure gage will display 275 kPa (40 psi). At low pressure, the gage will go to 0 kPa and the low pressure warning will be displayed in the driver information center (DIC). At high pressure, the gage will display 551 kPa (80 psi). Any values between these three values are calculated values determined by the ECM.
The instrument panel cluster (IPC) displays the vehicle voltage based on the information from the body control module (BCM). The IPC uses the serial data information from the BCM to provide a voltage level indication on the voltmeter.
DTC P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage
DTC P0523 Engine Oil Pressure (EOP) Sensor Circuit High Voltage
Volt Gage Inaccurate or Inoperative
Install a scan tool.
Turn the ignition ON, with the engine OFF.
With the scan tool, perform the instrument panel cluster (IPC) gauges output control.
Does the volt gauge move up and down when commanded?
If you paid someone to rebuild the engine, you need to go back for warranty work. If you did the work, you need to put on mechanical gauge, and find out if the pressures is low or if your sending unit is not accurate.
sounds like the expansion valve or the orfice may be clogged is your compressor making noise like a clinging inside if it isyou'l need to change the accumlator dryer as well as expansion or orfice along with the compressor. you could try what are the pressures with a fan in front of the vehicle if they go to 35-40 psi on low side and 200-250 psi on high side these are close to where they should be.
CHECK OIL PRESSURE FIRST.DEPENDS ON THE ENGINES SIZE JEEP OIL PRESSURE RANGES FROM 25 PSI TO 37 PSI.IF PRESSURE CHECKS OUT GOOD GAUGE COULD BE FAULTY.IF OIL PRESSURE IS STILL TOO HIGH.YOUR OIL TOO THICK.OIL RETURN HOLE STOPPED UP.OIL PUMP PRESSURE REGULATOR STUCK CLOSED.
May be bad oil pressure sending unit. Best way to check is to connect a mechanical oil pressure guage to engine and check pressures when engine is warm. Should be no lower than 40 psi at idle when warm, no higher than 70 psi at 2000 rpm.