WATER PUMP 0R0797 - Caterpillar

Use this procedure to troubleshoot a problem with an exhaust temperature sensor. Also, use this procedure if one of the following diagnostic codes is active or easily repeated.
Table 1
J1939 Code and Description Comments
173-9
Engine Exhaust Gas Temperature : Abnormal Update Rate The alarm output is activated.
The code is logged.
Illustration 1 g03818734
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Determine if a code is active or logged.
Codes
Result: A 173-9 code is active or logged.
Repair: The Electronic Control Module (ECM) has detected a problem with the communication between the ECM and the sensor.
Proceed to Test Step 3.
Result: A code is not active or logged.
Proceed to Test Step 2.
2. Inspect the Electrical Connectors and the Wiring
A. Turn the main disconnect switch to the OFF position.
B. Thoroughly inspect the connectors. Refer to Troubleshooting, "Electrical Connectors-Inspect" for additional information.
C. Perform a 45 N (10 lb) pull test on the connector wires.
D. Check the harness for abrasions and pinch points.
Connectors and Wiring
Result: The connectors and wiring appear to be OK.
Proceed to Test Step 3.
Result: There is a problem with the connectors and/or wiring.
Repair: Repair or replace the connectors or wiring. Ensure that all the seals are properly in place and ensure that the connectors are coupled.
If the problem is not resolved, proceed to Test Step 3.
3. Check for Electrical Power at the Harness Connector for the Exhaust Gas Temperature (EGT) Module
A. Ensure that the electrical power is removed from the engine.
B. Disconnect the harness connector at the EGT module.
C. Restore the electrical power to the engine. Set the engine control to STOP.
D. Measure the voltage between the following pins at the 70-pin connector for the EGT module:
- Pin 6 (+Battery) and Pin 7 (−Battery)
E. Remove the electrical power from the engine.
F. Restore the wiring to the original configuration.
24 4 V
Result: Voltage at the harness connector for the EGT module is 24 4 V.
Repair: The EGT module is receiving the proper operating voltage. Perform the following procedure:
1. Confirm that the 173-9 code is still active.
2. Connect Cat ET.
3. Use Cat ET to monitor the following:
- Codes
If the 173-9 code is still active, there is a problem in the circuit for the CAN data link. Refer to Troubleshooting, "Data Link -Test" for additional information.
If the 173-9 code is no longer active, there is probably an intermittent electrical problem in one of the power circuits. Refer to Troubleshooting, "Electrical Connectors - Inspect" for additional information.
Proceed to Test Step 4.
Result: Voltage at the harness connector for the EGT module is not 24 4 V.
Repair: The EGT module is not receiving the proper operating voltage. There is a problem in the harness or in a connector. Determine the cause of the excessive voltage drop. Perform the necessary repairs.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Resistance of the Data Link
A. Restore the electrical power to the engine. Set the engine control to STOP
B. Measure the resistance between the following EGT module connector