ALTERNATOR GP-CHARGING 2Y6452 - Caterpillar

Illustration 5 g01072562
Front view
(1) Unfiltered engine oil pressure sensor
(2) Filtered engine oil pressure sensor
(3) Connectors for the engine oil pressure sensors
During engine operation, disconnect the connector for 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 "324-03 Warning Lamp short to +batt", proceed to the “Expected Result”.Note: When the filtered engine oil pressure sensor is disconnected, the engine will shut down.
Disconnect the connector for 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 "542-03 Unfiltered Engine Oil Pressure open/short to +batt" diagnostic code was activated when the unfiltered engine oil pressure sensor is disconnected.The "Fault Relay" indicator illuminated and a "100-03 Engine Oil Pressure open/short to +batt" 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, "Inspecting Electrical Connectors".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 "323-03 Shutdown Lamp short to +batt" and/or a "324-03 Warning Lamp short to +batt" diagnostic code was generated. There is a problem with the output for the status indicators. The "542-03" and the "100-03" diagnostic codes were generated. The engine was shut down. Reconnect the connectors and proceed to Test Step 4.Test Step 4. Measure the Voltage for the Suspect Output at the P2 Connector
Illustration 6 g01076983
Terminal box
(1) Ground strap
(P2-28) Run Relay
(P2-29) Crank Terminate Relay
(P2-30) Fault Relay
(P2-31) Engine Control Alarm Status
Set the engine control to the OFF/RESET mode. Switch the 16 amp circuit breaker OFF.
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 (1).
Switch the 16 amp circuit breaker ON. Set the engine control to the STOP mode.
Note the voltage that is displayed on the voltmeter.
Set the engine control to the OFF/RESET mode. Switch the 16 amp circuit breaker OFF.
Disconnect the 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.
Switch the 16 amp circuit breaker ON. Set the engine control to the STOP mode.
Note the voltage that is displayed on the voltmeter. Expected Result:Before the suspect indicator was disconnected, voltage was displayed on