Low Oil Pressure Indicator Circuit Troubleshooting - Short

Engine

Low Oil Pressure Indicator Circuit Troubleshooting - Short

Low Oil Pressure Indicator Circuit Troubleshooting (Short)

1. Input signal test:

Input signal test
-1. Connect the HDS to the DLC; except K24Z7 engine How To Troubleshoot The Fuel And Emissions Systems, K24Z7 engine How To Troubleshoot The Fuel And Emissions Systems.

-2. Turn the ignition switch to ON (II).

-3. Make sure the HDS communicates with the vehicle and the ECM/PCM. If it does not communicate, troubleshoot the DLC circuit; except K24Z7 engine Testing and Inspection, K24Z7 engine Testing and Inspection.

-4. Check for DTCs; except K24Z7 engine How To Troubleshoot The Fuel And Emissions Systems, K24Z7 engine How To Troubleshoot The Fuel And Emissions Systems. If a DTC is present, diagnose, and repair the cause before continuing with this test.

-5. Start the engine, and check the OIL PRESSURE SWITCH in the PGM-FI DATA LIST with the HDS.

Is OFF indicated?
-YES- Replace the gauge control module (tach) Gauge Control Module (Tach) Removal and Installation.
-NO- The input signal is OK. Go to step 2.

2. Oil pressure switch test:

Oil pressure switch test
-1. Turn the ignition switch to LOCK (0).

-2. Check the oil pressure switch; except K24Z7 engine Testing and Inspection, K24Z7 engine Testing and Inspection.

Is the oil pressure switch OK?
-YES- The oil pressure switch is OK. Go to step 3.
-NO- Do the oil pressure test; except K24Z7 engine Testing and Inspection, K24Z7 engine Testing and Inspection. If the oil pressure is OK, replace the oil pressure switch; except K24Z7 engine Service and Repair, K24Z7 engine Service and Repair.

3. Shorted wire check (OIL_PRESS_SW/ENGOPSW line):

Shorted wire check (OIL_PRESS_SW/ENGOPSW line)
-1. Turn the ignition switch to ON (II), and jump the SCS line with the HDS, then turn the ignition switch to LOCK (0).
NOTE: This step must be done to protect the ECM/PCM from damage.

-2. Disconnect the following connectors.





-3. Check for continuity between test points 1 and 2.









Is there continuity?
-YES- Repair a short to ground in the OIL_PRESS_SW/ENGOPSW wire between the oil pressure switch and the ECM/PCM.
-NO- The OIL_PRESS_SW/ENGOPSW wire is OK. Update the ECM/PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good ECM/PCM; except K24Z7 engine , K24Z7 engine Service and Repair, then recheck. If the ECM/PCM was substituted, and the symptom/indication goes away, replace the original ECM/PCM; except K24Z7 engine , K24Z7 engine Service and Repair.