HEAD - 1105100 - Caterpillar

Note: With the release of Tier 4 Final engines, additional emissions control system components have been added to the engine to reduce the NOx output. The addition of these components requires three Electronic Control Modules (ECMs) for the engine and aftertreatment systems to operate. The most recent version of Cat® Electronic Technician (ET) must be used when connecting to the Electronic Control Modules. Refer to Special Instruction, REHS8170 for instructions on properly setting up the computer and Comm3 adapter for use on Tier IV applications. When viewing the Diagnostic or Event Codes screens, ensure that the "Include All ECM's" box is checked.Override Parameters
The override parameters screen has multiple overrides. The parameters control various functions on the engine and CEM. These functions and features allow the technician to troubleshoot different engine systems.Cat ET Location
Connect to Cat ET.
Select the appropriate Electronic Control Module (ECM)
Select the Diagnostics tab.
Select the Diagnostic Tests tab.
Select the Override Parameter tab.Override Parameters Listed in the Engine ECM Menu
Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid Override
The engine ECM will energize the exhaust balance valve solenoid to on or off. This override will be used when troubleshooting the exhaust balance valve.Fuel Priming Command Override
This override activates the fuel priming pump and allows fuel to flow into the engine fuel system.Ether injection Override
This override is used to activate the ether injection solenoid circuit to ensure that the circuit is working properly. The ether canister must be removed during testing of the ether solenoid circuit.Engine Fan Bypass
This override is used to turn ON the engine fan. The override can be used to test the engine fan operation. The engine fan speed is entered as a percent of full speed, this percent allows the user to operate the fan at different speeds.Overrides Parameters Listed in the Engine #1 Aftertreatment Controller Menu
DPF Differential Pressure Line Override
This override when Activated, will ignore any fault code from the DPF Delta P sensor. This override will be used when using the DPF crack detection procedure.Overrides Parameters Listed in the Diesel Exhaust Fluid Controller #1 Menu
DEF Coolant Diverter Valve Solenoid Override
The override is used to check the solenoid and diverter valve harness electrically. This override will open the coolant diverter valve which allows coolant to flow through the PETU assembly. This test can be used to verify that the coolant diverter valve is working properly.DEF Dosing Injector Override
This override allows the user to test the electrical circuit for the DEF injector. The override commands the DEF injector to open. This override only operates when there is no engine speed.System Troubleshooting Settings
The "System Troubleshooting Settings" screen will allow overrides to be enabled.Cat ET Location
Connect to Cat ET and select the appropriate ECM.
Select the Diagnostics tab.
Select the Diagnostic Tests tab.
Select "System Troubleshooting Settings".System Troubleshooting Settings Listed in the Engine ECM Menu
Operator Inducement Service Mode
The override is used by service technicians to stop the inducement counter and disable engine restrictions due to inducement in order to perform troubleshooting. Once the override is activated, navigation of other ET