PIN 8D6687 - Caterpillar

System Operation Description:The Engine Control Module (ECM) monitors the current flow through the coils of the applicable componentsThe ECM sets a diagnostic trouble code if the current flow through a coil is incorrect. These codes can be activated only when the ECM is sending a command to the control valves. A -5 code indicates that the current flow through the circuit is low and there is an open in the circuit. A -6 code indicates that the current flow through the circuit is high and there is a short in the circuit. Table 1 lists the diagnostic codes for incorrect current flow.Note: Some of the following codes may not be applicable for certain applications.
Table 1
Diagnostic Trouble Codes    
CDL Code    J1939 Code    Code Description    Comments    
444-5     677-5     Engine Starter Motor Relay : Current Below Normal     This code indicates there is a problem with the engine starter motor relay and/or the electrical circuit on the ECM.    
444-6     677-6     Engine Starter Motor Relay : Current Above Normal     This code indicates there is a problem with the engine starter motor relay and/or the electrical circuit on the ECM.    
1922-5     2949-5     Engine Intake Valve Actuation System Oil Pressure Control Valve : Current Below Normal     This code indicates that there is a problem with the Engine Intake Valve Actuation System Oil Pressure Control Valve circuit or solenoid.    
1922-6     2949-6     Engine Intake Valve Actuation System Oil Pressure Control Valve : Current Above Normal     This code indicates that there is a problem with the Engine Intake Valve Actuation System Oil Pressure Control Valve circuit or solenoid.    
2232-5     1074-5     Engine Retarder Solenoid : Current Below Normal     This code indicates there is a problem with the engine retarder solenoid and/or electrical circuit on the ECM.    
2232-6     1074-6     Engine Retarder Solenoid : Current Above Normal     This code indicates there is a problem with the engine retarder solenoid and/or electrical circuit on the ECM.    
2461-5     3479-5     ARD Fuel Pressure #1 Control : Current Below Normal     This code indicates there is a problem with the pilot fuel solenoid and/or electrical circuit on the CEM.    
2461-6     3479-6     ARD Fuel Pressure #1 Control : Current Above Normal     This code indicates there is a problem with the pilot fuel solenoid and/or electrical circuit on the CEM.    
3182-5     4301-5     Aftertreatment #1 Fuel Injector #1 Heater : Current Below Normal     There is low current flow between the ECM and the relay for the heating element.
The most likely cause of this code is an open circuit in the wiring between the ECM and the relay. There may be a problem with a connector.    
3182-6     4301-6     Aftertreatment #1 Fuel Injector #1 Heater : Current Above Normal     There is excessive current flow between the ECM and the relay for the heating element. If the