GRILL AS 3283766 - Caterpillar

Illustration 2 g01065357
Typical right side view
(1) Unfiltered engine oil pressure sensor
(2) Filtered engine oil pressure sensor
During engine operation, disconnect the connector for the unfiltered engine oil pressure sensor (1). Observe the "Engine Control Alarm Status" indicator on the control panel (if equipped). If you are only troubleshooting a 324-3 diagnostic code, proceed to the “Expected Result”.Note: When the filtered engine oil pressure sensor is disconnected, the engine will shut down.
Disconnect the connector for the filtered engine oil pressure sensor (2). Observe the "Fault Relay" indicator on the control panel (if equipped).
Use the "Diagnostics" screen on Cat ET to look for active diagnostic codes. Expected Result:The "Engine Control Alarm Status" indicator illuminated and a 542-3 diagnostic code was activated when the unfiltered engine oil pressure sensor is disconnected.The "Fault Relay" indicator illuminated and a 100-3 diagnostic code was activated when the filtered engine oil pressure sensor is disconnected. The engine was shut down.Results:
OK - The indicators, diagnostic codes, and shutdown were activated according to the "Expected Result". The outputs for the status indicators seem to be operating correctly at this time. The original problem seems to be resolved.Repair: The original diagnostic code was probably caused by a poor electrical connection.If there is an intermittent problem that is causing the codes to be logged, refer to Troubleshooting, "Electrical Connectors - Inspect".STOP
Not OK - The "Engine Control Alarm Status" indicator and/or the "Fault Relay" indicator did not illuminate normally when the sensors were disconnected. A 323-3 diagnostic code and/or a 324-3 diagnostic code was generated. There is a problem with the output for the status indicators. The "542-3" and the "100-3" diagnostic codes were generated. The engine was shut down. Proceed to Test Step 4.Test Step 4. Measure the Voltage of the Suspect Indicator at the P2 Connector
Illustration 3 g02015273
Typical terminal box
(3) P2 connector
(4) Ground strap for the ECM
(P2-28) Run Relay
(P2-29) Crank Terminate Relay
(P2-30) Fault Relay
(P2-31) Engine Control Alarm Status
Insert a 7X-1710 Multimeter Probe into the suspect control terminal in the P2 connector.
Connect the positive lead of a voltmeter to the end of the 7X-1710 Multimeter Probe. Connect the voltmeter's negative lead to ground strap (4).
Note the voltage that is displayed on the voltmeter.
If the customer has equipment for the status indicators, disconnect one wire from the suspect indicator. Be sure to disconnect the wire that comes from the ECM.
Insulate the end of the wire with electrical tape in order to ensure that the wire does not create a short circuit.
Note the voltage that is displayed on the voltmeter. Expected Result:Before the suspect indicator was disconnected, voltage was displayed on the voltmeter. After the suspect indicator was disconnected, the voltmeter displayed approximately zero volts.Results:
Yes - Before the suspect indicator was disconnected, voltage was displayed on the voltmeter. After the suspect indicator was disconnected, the voltmeter displayed approximately zero volts. There is a problem in the customer's equipment.Repair: The problem could be caused by a poor electrical connection, a wire, or a component in the customer's equipment.Set the engine control to the