To determine if a restricted oil cooler is causing low oil pressure, perform the following:
Install the Diagnostic Data Reader to the vehicles Display Data Line Adaptor, see Figure
; refer to OEM guidelines.
Start and run the engine at 1800 r/min.
Run the engine at 1800 r/min with a no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range, 88-96C (190-210F).
If the DDR is indicating a lubricating oil temperature less than or equal to 110C (230F), no further troubleshooting is required, check pressure regulator valve; refer to Section
. Shut down the engine and disconnect the DDR.
If the DDR is indicating a lubricating oil temperature greater than 110C (230F), repair oil cooler; refer to Section
. Shut down the engine.
Oil Cooler Repair
Perform the following steps to repair the oil cooler: