808616A00 Mercury DECAL SET

Table 1
Diagnostic Codes Table
Code and Description Conditions which Generate this Code System Response
337-2 Remote Emergency Stop Switch : Erratic, Intermittent, or Incorrect The two inputs from the emergency stop switch are in the opposite state. The code is logged.
446-5 Air Shutdown Relay : Current Below Normal The Electronic Control Module (ECM) detects an open circuit and/or a short to the +Battery in the solenoid circuit. The code is logged.
446-6 Air Shutoff Relay short The ECM detects a short circuit to ground in the solenoid circuit.
E2087(3) Air Intake Shutoff Closed The ECM detects a closed shutoff switch. The code is logged.
The code is latched. The electrical power to the ECM must be cycled prior to restarting the engine. The ECM has the ability to stop the engine in an emergency situation by shutting off the air supply to the engine. The ECM energizes the circuit for the air shutoff solenoid. The solenoid supplies air pressure that trips the air shutoff valves for both sides of the engine. The air shutoff solenoid is located on the air shutoff mechanism that is for the right side of the engine.This system also incorporates two switches that monitor the position of the air shutoff mechanisms. If the air shutoff mechanisms are closed, the switches complete a circuit that is wired to a low side ECM driver. The ECM detects this condition and the ECM logs an event code.The air shutoff system is optional for this application. Use Caterpillar Electronic Technician (ET) to program Air Intake Shutoff Detection Installation Status to "Installed" in order to enable the air shutoff system.There are two 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 circuit for the air shutoff solenoid. An event code is generated for this condition. Once an event for the air shutoff system is activated, the event is latched until electrical power to the ECM system is cycled.Emergency Stop Sequence - The second condition occurs when the emergency stop switch is activated. When the emergency stop switch is placed in the STOP position, voltage is supplied directly to the air shutoff solenoid. The solenoid energizes and the air shutoff mechanisms are closed.Ensure that both of the air shutoff mechanisms are manually reset after activating the air shutoff system in order to start the engine again. Regardless of the reason for activation, the main power to the ECM must be turned OFF for 30 seconds in order to reset the engine control.Use Cat ET to view the "Air Intake Shutoff Position" parameter in order to confirm the status of the air shutoff system.
Illustration 1 g01560817
Location of the low current power distribution panel (front left side engine view)
(1) Harness for the low current power distribution panel
(2) Low current power distribution panel
Illustration 2 g01560816
Location of the connectors at low current power distribution panel (2) that are for the engine's shutdown
(3) ECM relay
(4) Yellow connector
(5) Orange connector
(6) Fuse for the auxiliary circuit
(7) Fuse for the ECM
(8) −Battery
(9) +Battery
Illustration 3 g01827000
Schematic for the air shutoff system
Test Step 1. Inspect the Electrical Connectors and the Wiring
Turn the battery disconnect switch to the OFF position.
Verify that the air shutoff mechanisms are set to the OPEN position.
Illustration 4 g01827093
Location of the connectors at the control box that are for the fuel control (typical top front engine view)
(10) Right rail connector
(11) J1/P1 ECM connector
(12) J2/P2 ECM connector
(13) Left rail connector
(14) Engine interface connector at the control box
(15) Connector to the low current power distribution panel
Illustration 5 g01560818
Location of the components at the air shutoff mechanism (right side engine view)
(16) Air shutoff solenoid
(17) Air shutoff switch
Thoroughly inspect connectors (4) and (5). Also, thoroughly inspect connections (10 through 15). Inspect the connectors at the air shutoff mechanism that are for solenoid (16). Also, inspect switches (17) for the air shutoff that are on both sides of the engine. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 6 g01560819
Terminal locations at the P1 ECM connector for the air shutoff system
(P1-19) Shutdown output
(P1-41) Position of the air shutoff
Illustration 7 g01560820
Terminal locations at the P2 ECM connector for the air shutoff system
(P1-14) Digital return
Illustration 8 g01826914
Terminal locations at the left rail connector that are for the air shutoff system
(Terminal 25) Common wiring between switches