| Cause | Correction | |
| Malfunctioning pressure switch/gage |
 |
Verify the pressure switch is functioning correctly. |
 |
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| Engine running too cold |
|
Refer to Troubleshooting Logic for coolant temperature below normal. |
|
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| Oil viscosity too thick |
|
Make sure the correct oil is being used. |
|
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| Relief valve stuck closed |
|
Check/replace valve. |
|
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| If replaced, six cylinder lube pump, installed in four cylinder |
|
Verify that the correct pump is installed. |