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  • P0523 Oil Pressure Voltage Too High

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    DTC P0523: OIL PRESSURE VOLTAGE TOO HIGH

    1. Turn ignition on with engine off. Using scan tool, check for DTCs. If DTC P1475: AUXILIARY 5 VOLT OUTPUT TOO HIGH does not exist, go to next step. If DTC P1475: AUXILIARY 5 VOLT OUTPUT TOO HIGH is present, perform DTC P1475: AUXILIARY 5 VOLT OUTPUT TOO HIGH test.

    2. Using scan tool, recheck for any other DTCs. If no other DTCs exist, go to next step. If any other DTCs exist, repair all existing DTCs before continuing.

    3. Turn ignition off. Disconnect engine oil pressure sensor connector. Engine oil pressure sensor is located on driver's side of cylinder block, just behind ECM and contains 3-pin connector. See Fig. 48 . ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Turn ignition on with engine off. Using voltmeter, check voltage at terminal "A" (Orange wire) on engine oil pressure sensor connector. If voltage is 4.75-5.25 volts, go to next step. If voltage is not 4.75-5.25 volts, repair Orange wire between ECM and engine oil pressure sensor. Perform TEST VER-2A .

    4. Ensure ignition is on with engine off. Using voltmeter, check voltage between terminals "A" (Orange wire) and "B" (Black/Light Blue wire) on engine oil pressure sensor connector. If voltage is 4.75-5.25 volts, go to next step. If voltage is not 4.75-5.25 volts, repair open on Black/Light Blue wire between ECM and engine oil pressure sensor. Perform TEST VER-2A .

    5. Ensure ignition is on with engine off and engine oil pressure sensor connector is still disconnected. Using scan tool, read engine oil pressure sensor voltage. Engine oil pressure sensor voltage may also be referred to as oil pressure sensor voltage. If engine oil pressure sensor voltage is .39-.61 volt, go to next step. If engine oil pressure sensor voltage is not .39-.61 volt, replace engine oil pressure sensor. Perform TEST VER-2A .

    6. Turn ignition off. Ensure engine oil pressure sensor connector is still disconnected. Disconnect ECM connector. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. Using ohmmeter, check resistance between terminal "C" (Gray/Black wire) on engine oil pressure sensor connector and terminal No. 6 (Gray/Black wire) on ECM connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Gray/Black wire between ECM and engine oil pressure sensor. Perform TEST VER-2A .

    7. Ensure engine oil pressure sensor connector and ECM connector are still disconnected. Using ohmmeter, check resistance between terminals "A" (Orange wire) and "C" (Gray/Black wire) on connector for engine oil pressure sensor. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair Orange wire and Gray/Black wire between ECM and engine oil pressure sensor, as they are shorted together. Perform TEST VER-2A .

    8. Turn engine on with engine off. Using scan tool, read engine oil pressure sensor voltage. Engine oil pressure sensor voltage may also be referred to as oil pressure sensor voltage. If engine oil pressure sensor voltage is .39-.61 volt, replace ECM. Perform TEST VER-2A . If engine oil pressure sensor voltage is not .39-.61 volt, test is complete.


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