Test Step 1. Check for Diagnostic Codes -807640289

111

TM 9-2320-312-24-2

Troubleshooting Section

D. Use the 1U-5470 Engine Pressure Group to

If the "Engine Monitoring" is programmed to

measure the engine oil pressure on the right

"DERATE" or "SHUTDOWN", engine speed is limited

side engine high pressure oil gallery. Select a

to a maximum of 1350 rpm. The vehicle speed is

port that is located near the engine oil pressure

limited to a maximum of 72 km/h (45 mph), and the

sensor, but not the sensor port.

power is limited. The engine will shut down if the

conditions exist for a long enough period in the

E. Start the engine and run at low idle. If the engine

SHUTDOWN mode.

oil pressure does not exceed 35 kPa (5 psi) after

five seconds, stop the engine.

Troubleshooting:

F. Depress the accelerator pedal to the high idle

This diagnostic code indicates very low oil pressure.

position and check for oil leakage. Repair any

This diagnostic code does not indicate a problem

leaks.

with the ECM or the oil pressure sensor. Refer

to graphs for oil pressure that are shown in

G. Operate the engine at low idle, at 1200 rpm and

Troubleshooting, "System Overview".

at high idle in order to compare the engine oil

Test Step 1. Check for Diagnostic Codes.

pressure from the status screen to the 1U-5470

Engine Pressure Group measurement at each

rpm.

A. Connect Caterpillar Electronic Technician (ET) to

the service tool connector.

Expected Result:

B. Turn the keyswitch to the ON position. The

The ET display and the measured engine oil

engine should be off.

pressure from the 1U-5470 Engine Pressure Group

are within 35 kPa (5 psi) of each other.

C. Check for any active diagnostic codes or logged

diagnostic codes.

Results:

Expected Result:

Yes The sensor is functioning correctly. If

There should be no diagnostic codes that are

a problem is still suspected the problem is a

mechanical problem. The problem is not an

present.

electronic problem.

Results:

Repair: Perform the following diagnostic

OK Proceed to Test Step 2.

procedure:

Not OK

Refer to Troubleshooting, "Troubleshooting without

a Diagnostic Code" for a procedure that best

describes the conditions.

Repair: Repair the diagnostic codes that are

present. Refer to the appropriate topic in the

"Troubleshooting With a Diagnostic Code" section

STOP.

of this manual.

Ensure that the repair eliminates the problem.

Repair: Perform the following diagnostic

procedure:

STOP.

Test Step 2. Check the Engine Oil

1. Temporarily install another sensor.

Pressure Sensor.

2. Repeat this test step.

A. Connect ET to the cab data link connector.

3. If the problem is resolved with the new sensor,

replace the sensor.

B. Turn the ignition key switch to the ON position.

4. Verify that the repair eliminates the problem.

C. The status screen will display the pressure

reading from the sensor. The pressure reading

STOP.

for the engine oil pressure sensor should be less

than 21 kPa (3 psi).