HOSE AS 2603526 - Caterpillar

Illustration 10 g01641533
Terminal locations for the electronic fluid temperature control at the harness connector for the TCM (Terminal 1) +Battery (Terminal 3) Return (Terminal 5) −Battery (Terminal 8) Keyswitch (Terminal 10) Sensor signal
Illustration 11 g01765294
Terminal locations at the machine interface connector for the temperature sensor at the outlet of the coolant pump (Terminal 28) Sensor signal (Terminal 34) Return
Illustration 12 g01241538
Terminal locations at the temperature sensor at the outlet of the coolant pump (Terminal 1) Sensor signal (Terminal 2) Return
Table 2
Troubleshooting Test Steps    Values    Results    
1. Check for Active Diagnostic Codes
A. Connect Cat ET to the service tool connector.
B. Restore the electrical 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 a diagnostic code has occurred several times.
Note. A diagnostic code that is logged several times is an indication of an intermittent problem. Most intermittent problems are the result of a bad connection between a socket and pin in the connector. An intermittent problem may also be caused by a poor connection between a wire and terminal.
E. Look for the following diagnostic codes that are active or logged:
- 168-3
- 168-4
- 2349-19
- 2854-9
- 4193-2
- 4193-3
- 4193-4
F. Remove the electrical power from the ECM.
   
Codes    
Result: No diagnostic codes are active for the TCM.
There may be an intermittent problem in the harness or in a connector. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct procedures for inspecting electrical connectors..
Result: A 168-3 or 168-4 diagnostic code is active. The TCM has detected there is a problem with the supply voltage to the unit.
Proceed to Test Step 2.
Result: A 2854-9 diagnostic code is active. The ECM detects a problem with data link communications for the TCM.
Proceed to Test Step 2.
Result: The 2349-19 diagnostic code is active. The ECM is reporting that the TCM detects a problem in the circuit for the temperature sensor at the coolant pump.
Proceed to Test Step 4.
Result: The 4193 diagnostic code is active. The TCM detects a problem in the circuit for the temperature sensor at the coolant pump
Proceed to Test Step 4.    
2. Check the Supply Voltage at the TCM
A. Disconnect the harness connector at the TCM.
B. Restore the electrical power to the ECM. Ensure that the emergency stop switch is in the ON position. Do not start the engine.
C. Use a multimeter to measure the supply voltage between terminal 1 (+Battery) and terminal 5 (−Battery) on the harness side of the connector.
D. Remove the electrical power from the ECM.
   
Supply voltage between 18 V and 32 V.    
Result: The supply voltage is between 18 V and 32 V. The supply voltage is correct at the temperature control module.
Proceed to Test Step 3.
Result: The supply voltage is not between 18 VC and 32 V.
Check the condition of the 10 Amp fuse that is in the low current power distribution panel. If the