CONNECTOR AS 1224681 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the coolant temperature sensor or if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table    
Code and Description    Conditions which Generate this Code    System Response    
110-3 Engine Coolant Temperature Sensor : Voltage Above Normal     The engine's Electronic Control Module (ECM) detects signal voltage that is more than 4.9 VDC for eight seconds. The ECM has been powered for at least two seconds.     The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
The value of the parameter is set to the last value from the sensor that is valid.    
110-4 Engine Coolant Temperature Sensor : Voltage Below Normal     The ECM detects signal voltage that is less than 0.2 VDC for eight seconds. The ECM has been powered for at least two seconds.    System OperationUse this procedure to troubleshoot any suspect problems with the engine's coolant temperature sensor.The sensor signal for the passive sensor is routed from the ECM to terminal 1 of the sensor connector. The sensor return for the passive sensors is routed from the ECM to terminal 2 of the sensor connector.
Illustration 1 g01420789
Schematic for the passive analog sensor
Illustration 2 g01420866
Location of the passive analog sensor (right front side engine view) (1) Engine coolant temperature sensor
Illustration 3 g01435647
Locations of the connectors at the terminal box for the master ECM (left front engine view) (2) J1/P1 ECM connectors (3) J7/P7 control harness connectors for the passive sensors
Illustration 4 g01420865
Terminal locations at the P1 ECM connector for the passive analog sensors (P1-3) Analog return (P1-27) Engine coolant temperature
Illustration 5 g01420881
Terminal locations at the P7 control harness connector for the passive analog sensor (P7-C) Engine coolant temperature (P7-P) Analog return (P7-Z) Shield
Illustration 6 g01436505
Terminal locations at the connector for the passive analog sensor (Terminal 1) Sensor signal (Terminal 2) Analog sensor returnTest Step 1. Check for Diagnostic Codes that are Active or Logged
Turn the engine control to the OFF/RESET position. Remove electrical power from the engine.
Connect Caterpillar Electronic Technician (ET) to the service tool connector.
Restore electrical power to the engine. Turn the engine control to the STOP position.
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.
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 poor connection between a socket and a pin in a connector or of a poor connection between a wire and a terminal.
Determine if the problem is active and related to one of the following failure modes for the analog passive sensor:
-3
-4
Turn the engine control to the OFF/RESET position. Remove electrical power from the engine.Expected Result:A diagnostic code is not active.Results:
OK - A diagnostic code is not active.Repair: There may be an intermittent