858781A 2 Mercury HARNESS ASSEMBLY (DIRECT INJECTOR)

Table 1
Diagnostic Codes Table    
J1939 Code    CDL Code    Code Description    Comments    
110-3     110-3     Engine Coolant Temperature Sensor : Voltage Above Normal     The code is logged if the engine has been running for more than seven minutes and an open circuit has been detected.    
110-4     110-4     Engine Coolant Temperature Sensor : Voltage Below Normal     The code is logged. The ECM detects voltage that is not in the acceptable range.    
171-3     171-3     Ambient Air Temperature : Voltage Above Normal     The code is logged. The ECM detects voltage that is not in the acceptable range.    
171-4     171-4     Ambient Air Temperature : Voltage Below Normal     The code is logged. The ECM detects voltage that is not in the acceptable range.    
172-3     2526-3     Air Inlet Temperature Sensor : Voltage Above Normal     The code is logged.
The ECM detects voltage that is not in the acceptable range.    
172-4     2526-4     Air Inlet Temperature Sensor : Voltage Below Normal     The code is logged.
The ECM detects voltage that is not in the acceptable range.    
174-3     174-3     Fuel Temperature Sensor : Voltage Above Normal     The code is logged. The ECM will flag the fuel temperature as invalid data and the fuel temperature is set to a default value of 40 °C (104 °F).    
174-4     174-4     Fuel Temperature Sensor : Voltage Below Normal    
175-3     175-3     Engine Oil Temperature Sensor:Voltage Above Normal     The code is logged. The ECM detects voltage that is not in the acceptable range.    
175-4     175-4     Engine Oil Temperature Sensor:Voltage Below Normal     The code is logged. The ECM detects voltage that is not in the acceptable range.    
412-3     3386-3     EGR Temperature Sensor : Voltage Above Normal     The code is logged.
The ECM detects voltage that is not in the acceptable range.    
412-4     3386-4     EGR Temperature Sensor : Voltage Below Normal     The code is logged.
The ECM detects voltage that is not in the acceptable range.    
441-3     1836-3     Auxiliary Temperature 1 : Voltage Above Normal     The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.    
441-4     1836-4     Auxiliary Temperature 1 : Voltage Below Normal     The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.    
442-3     3683-3     Auxiliary Temperature 2 : Voltage Above Normal     The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.    
442-4     3683-4     Auxiliary Temperature 2 : Voltage Below Normal     The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.    
1385-3     1836-3     Auxiliary Temperature Sensor : Voltage Above Normal     The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.    
1385-4     1836-4     Auxiliary Temperature Sensor : Voltage Below Normal     The code is logged. The ECM will flag the temperature as invalid data and the temperature is set to a default value.    
2630-3     3372-3     Engine Charge Air Cooler #1 Outlet Temperature Sensor : Voltage Above Normal     The code is logged.
The ECM detects voltage that is not in the acceptable range.    
2630-4     3372-4     Engine Charge Air Cooler #1 Outlet Temperature Sensor : Voltage Below Normal     The code is logged.
The ECM detects voltage that is not in the acceptable range.    System OverviewThe sensor signal for the passive sensor is routed from the ECM to terminal 1 of each sensor connector. The sensor return for the passive sensors is routed to the ECM from terminal 2 of each sensor connector.Diagnostics on the Caterpillar Electronic Technician (ET)Wiggle Test - The Wiggle Test allows you to monitor the status of the signals from the sensors.For additional information regarding the Wiggle Test, refer to the documentation that accompanies the Cat ET software.
Illustration 1 g01155187
Terminal locations at the connector for the passive analog sensors (Terminal 1) Sensor signal (Terminal 2) Analog sensor return
Illustration 2 g03665814
Complete the procedure in the order in which the steps are listed.
Table 2
Troubleshooting Test Steps     Values     Results    
1. Check for Diagnostic Trouble Codes
A. Connect to Cat® Electronic Technician (ET).
B. Turn the keyswitch to the ON position.
C. Access the "Active Diagnostic Code" screen on Cat ET.
Wait at least 30 seconds in order for the diagnostic codes to become active.
D. Look for these active codes or logged codes:
1. -3
2. -4
   
Codes    
Result: A -3 diagnostic code is active.
Proceed to Test Step 2.
Result: A -4 diagnostic code is active.
Proceed to Test Step 3.
Result: To troubleshoot a logged 3386-3 or a 412-3 diagnostic code during cold mode, Proceed to Test Step 5.
This code will not become active during cold mode.
Result: For a diagnostic code that is logged but not currently active, Proceed to Test Step 4.
   
2. Create a Short at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect sensor.
C. Install the jumper wire between terminal 1 (sensor signal) and terminal 2 (sensor return) at the sensor connector.
D. Turn the keyswitch to the ON position.
E. Monitor th