ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
164-E-00 Data is Valid but Above Normal Operating Range. High Injection Actuation Oil Pressure.
Evaluate the quality of the oil.
Extended oil drain intervals may affect the operation of the HEUI high pressure oil system.
Check the maintenance records for the engine. Ensure that the oil change
interval has not been exceeded.
a. If the engine has been properly maintained. Proceed to STEP 3.
b. If the oil change interval for the engine has been exceeded, perform an oil
change on the engine. Run the engine at operating rpm range for 10 to 15
minutes to purge any trapped air or debris that is in the system. If the
problem still exists or if the problem recurs in a short period or time, proceed
to STEP 3.
Perform the Injection Actuation Pressure Test.
a. Install 8T-0852 pressure gauge or equivalent on the high pressure oil rail
(Figure 6, Item 5).
b. Connect the Cat ET to connector CDC-P7 (WP 0012).
Perform the Injection Actuation Pressure Test using the Cat ET. Record the
results in Table 3.
The Injection Actuation Pressure Test can be used to vary the injection actuation pressure. The
test adjusts the oil pressure in steps. Some versions of Cat ET may have three steps in the test
and some versions of Cat ET may have four or more steps in the test.