CORE AS-HYDRAULIC OIL COOLER 2607601 - Caterpillar

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Terminal locations at the left rail connector that are for the analog sensors (Terminal 20) Analog return (Terminal 21) Left intake manifold air temperature
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Terminal locations at the right rail connector that are for the analog sensors (Terminal 14) Engine coolant temperature (Terminal 27) Analog return (Terminal 48) Right intake manifold air temperature (No 2) (Terminal 49) Filtered fuel temperature (Terminal 55) High pressure fuel temperature (Terminal 59) Filtered engine oil temperature
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Terminal locations at the sensor connector for the analog sensors (Terminal 1) Sensor signal (Terminal 2) Analog return
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for Diagnostic Codes that are Active or Logged
A. Connect Caterpillar Electronic Technician (ET) to the service tool connector.
B. Restore power to the ECM.
C. Monitor the diagnostic codes on Cat ET. Check and record any diagnostic codes.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
D. Determine if the problem is active and related to one of the following diagnostic codes:
-3 Voltage above normal
-4 Voltage below normal
    Code    
Results: No diagnostic codes are active at this time.
Repair: The problem may be intermittent. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect".
Results: An active -3 diagnostic code is present.
Proceed to Test Step 2.
Results: An active -4 diagnostic code is present.
Proceed to Test Step 4.
   
2. Check for a Short Circuit to the +Battery at the Sensor Connector
A. Measure the voltage on the harness side of the sensor connector between pin 1 and pin 2 for the suspect sensor.
    Short Circuit    
Results: The voltage is less than battery voltage.
Proceed to Test Step 3.
Results: The voltage is equal to battery voltage.
Repair: There is a short in the harness to the +Battery. Repair the wiring.
   
3. Create a Short Circuit at the Sensor Connector
A. Disconnect the suspect sensor.
B. Fabricate a jumper wire that is long enough to create a short circuit at the sensor connector. Crimp connector pins to each end of the jumper wire.
C. Disconnect the connector from the suspect sensor.
D. Use the wire jumper in order to create a short between terminal 1 (sensor signal) and terminal 2 (analog return) on the harness side of the sensor connector.
E. Restore power to the ECM.
F. Access the "Active Diagnostic Code" screen on Cat ET. Check for an active -4 diagnostic code for the suspect sensor.
Note: Wait at least 30 seconds in order for the diagnostic codes to become active.
G. Remove power from the ECM.
    Short Circuit    
Results: A -3 diagnostic code was active before creating the short at the sensor connector. A -4 diagnostic code became active after creating the short at the sensor connector.
Repair: Temporarily connect a new sensor to the harness, but do not install the new sensor in the engine. Verify that there are no active diagnostic codes for the sensor. If there are no active diagnostic codes for the sensor, permanently install the new sensor. Clear any logged diagnostic codes.
Results: A -3 diagnostic code is still