ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
CORRECTIVE ACTION - Continued
d. The pressure that is measured with the pressure gauge for each step and the
pressure that is displayed on the Cat ET for each step should be within
1379 kPa (200 psi). If the Cat ET readings are good, the pressure gauge
readings are not necessary.
(1) If the pressure difference is within specifications the injection actuation
pressure sensor is operating properly. Proceed to STEP 4.
(2) If the pressure difference is not within specifications, the injection
actuation pressure sensor may be faulty. Replace the sensor and repeat
this test step. If the problem still exists, reinstall the original sensor and
proceed to STEP 5.
Perform the Injection Actuation Pressure Test at both low idle and at operating
a. Turn the ENGINE CONTROL switch to MANUAL START. Perform the
Injection Actuation Pressure Test at operating RPM, using the Cat ET.
b. Go to the bottom left corner of the Cat ET screen. Select the START button
to start the test. Results for the 1st measurement will be displayed.
Record the results in Table 4.
d. Select the STEP-UP button. Results for the next measurement will be
e. Record results in Table 4.
Repeat steps 3d. and 3e. for measurements 3 and 4. Observe the desired
pressure reading and compare to actual pressure reading.
g. If the pressure reading is below the desired reading for any measurement,
proceed to STEP 5.
Remove wires from terminals 19 and 20 of LSM A4.
Start generator set. Engine will increase to idle speed (apx 1200 RPM.).
Perform the Injection Actuation Pressure Test at idle RPM using the Cat ET.
Repeat STEP 3 a thru g. In STEP 3a, perform test at idle speed instead of
If the injection actuation pressure output is between 65 percent and 100
percent of the DESIRED INJECTION PRESSURE, the injection actuation
pressure output is within specifications.
m. If the injection actuation pressure output is not within specifications, proceed
to STEP 5.