Engine Lubrication System Symptom Troubleshooting - Low oil pressure indicator stays on
Low oil pressure indicator stays on
1.
Input signal test:

Input signal test
?1.
Connect the HDS to the DLC.

?2.
Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.

?3.
Make sure the HDS communicates with the vehicle and the PCM. If it does not communicate, go to the DLC circuit trouble shooting.

?4.
Check for DTCs. If a DTC is present, diagnose, and repair the cause before continuing with this test.


?5.
Start the engine, and check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
OIL PRESSURE SWITCH
OFF
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
     
NO
     
     
     
Go to step 2.
2.
Oil pressure switch test:

Oil pressure switch test
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Check the oil pressure switch.

Is the oil pressure switch OK?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
3.
Shorted wire check (ENG OP SW line):

Shorted wire check (ENG OP SW line)
?1.
Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.

?2.
Jump the SCS line with the HDS.
NOTE: This step must be done to protect the PCM from damage.


?3.
Disconnect the following connectors.

?4.
Check for continuity between test points 1 and 2.
Test condition
IG LOCK (0) or OFF mode
PCM connector B (51P): disconnected
Oil pressure switch 1P connector: disconnected
Test circuit
ENG OP SW
Test point 1
Oil pressure switch 1P connector No. 1 (YEL/RED)
Test point 2
Body ground
 


Is there continuity?

     
YES
     
     
     
Repair a short to ground in the ENG OP SW wire between the oil pressure switch and the PCM.?
     
NO
     
     
     
Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the PCM was substituted, and the symptom/indication goes away, replace the original PCM.?