CLAMP AS-TURBINE 3156568 - Caterpillar

System Operation Description:Use this procedure in order to troubleshoot the air shutoff system or use this procedure 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    
446-5 Air Shutdown Relay current below normal     The Electronic Control Module (ECM) detects low current in the circuit. The ECM can only detect this condition when the output driver is not activated.     The code is logged.    
446-6 Air Shutoff Relay short     The ECM detects excessive current flow in the circuit. The ECM can only detect this condition when the output driver is activated.    
E2087(3) Air Intake Shutoff Closed     The ECM detects an "Active" condition in the detection circuit that monitors the state of the air shutoff valves. The configurable parameter for the air shutoff system is set to "Installed".     The code is latched until power is cycled to the ECM. The process for starting the engine will be stopped and the process for starting the engine will be disabled. If engine rpm is present, the air shutoff relay will be activated.
The code is logged.    
E2088(1) Air Intake Shutoff Detection Circuit Detected but Not Installed     The ECM detects an "Active" condition in the detection circuit that monitors the state of the air shutoff valves. The configurable parameter for the air shutoff system is set to "Not Installed".     The code is logged.    A normally closed switch at the air shutoff valves will open when the air shutoff solenoid activates the air shutoff valve. The switch input to the ECM notifies the ECM that the air shutoff valves are closed. The ECM will not send injection signals to the injector solenoids until the switch inputs from the air shutoff valves indicate that the valves are open. If the circuit indicates that the air shutoff valves are closed, the ECM will generate the E2087 event code.Note: The air shutoff is optional. A programmable parameter needs to be set to "Installed" with Caterpillar Electronic Technician (ET) in order to enable the air shutoff system. If the air shutoff system is installed on the engine but the configurable parameter is not set to "Installed", the ECM will detect the air shutoff system through the normally closed switches on the air shutoff valves. If this happens the E2088(1) event code will be generated.The ECM has the ability to stop the engine in an emergency situation by shutting off the air supply to the engine. The ECM activates a relay which energizes two air shutoff solenoids. The solenoids trip the air shutoff valves.There are three conditions which can cause the ECM to activate the air shutoff:Engine Overspeed - The first condition occurs when the ECM detects an engine overspeed. During an engine overspeed, the ECM energizes the air shutoff relay. The ECM supplies voltage to the air shutoff relay for one second. The output