804827 Mercury HOSE

Table 1
Diagnostic Codes Table    
Description    Conditions which Generate this Code    System Response    
632-5 Engine Fuel Shutoff Valve #1 : Current Below Normal     The Electronic Control Module (ECM) detects a low current in the circuit for the GSOV for 2 seconds.
The output driver must be off for 5 seconds in order for this code to become active.     The code is logged.
The amber warning lamp is illuminated.
The service tool displays "Error Indicator" on the status screen for this parameter.    
632-6 Engine Fuel Shutoff Valve #1 : Current Above Normal     While the output driver is on for 5 seconds, the ECM detected a high current in the circuit for the GSOV for one second.     The code is logged.
The amber warning lamp is illuminated.
The service tool displays "Error Indicator" on the status screen for this parameter.
The output driver automatically resets and the output driver continues to try to activate the circuit component.    
632-7 Engine Fuel Shutoff Valve #1 : Not Responding Properly     The Engine Control Switch (ECS) is placed in the STOP position. The ECM has shut off the fuel to the engine, but the engine rpm remains above the crank terminate speed. The engine speed exceeded the crank terminate speed for a period that exceeds the "Engine Speed Drop Time".     The code is logged.
The red stop lamp is illuminated.
The power to the GSOV remains in the de-energized state and the ECM removes ignition power from the engine.    The ECM contains the logic and the outputs for control of starting the engine and stopping the engine. Some of the logic for starting the engine and for stopping the engine is customer programmable. The logic responds to inputs from the following components: ECS, emergency stop switch, remote start switch, data link and other inputs.The ECM outputs a signal in order to control the solenoid for the GSOV. To enable gas flow to the engine, the GSOV must be energized.The most likely cause of a diagnostic code is a poor electrical connection or a problem in a wiring harness. The next likely cause may be a problem with the solenoid. The least likely cause is a problem with the ECM.When the 632-7 Engine Fuel Shutoff Valve #1 : Failure occurs, the ECM assumes that the GSOV did not close. The ECM terminates the ignition. If the GSOV does not respond to the ECM command, unburned gas will remain in the air inlet and exhaust system.Note: Ensure that the unburned gas is purged from the exhaust before restarting the engine. Failure to purge the unburned gas from the engine may result in an explosion in the exhaust piping.The following information describes the systems operation when the GSOV is controlled by the ECM:The ECM sends an output signal to the solenoid for the GSOV that controls the operation of the GSOV. This output is energize-to-run. During the crank cycle, when the engine speed exceeds 50 rpm, the ECM provides a voltage of +Battery to the output for the GSOV. The solenoid becomes energized. As the valve opens, fuel begins to flow to the engine. The ECM removes the voltage from this output in order to stop the engine. The solenoid for the GSOV becomes de-energized. The fuel flow to the engine is stopped.
Illustration 1 g01920674
Schematic of the circuit for the GSOV
Illustration 2 g01920713
Location of the connectors at the ECM (right front engine view) (1) J1/P1 ECM connectors for the GSOV
Illustration 3 g01921613
Location of the components that are for control of the GSOV (typical location) (2) Solenoid for the GSOV (3) Gas Shutoff Valve (GSOV)
Illustration 4 g01920953
Terminal locations at the P1 ECM connector that are associated with the GSOV (P1-32) Gas shutoff valve (P1-25) Return
Illustration 5 g01415822
Terminal locations at the connector for the GSOV (Terminal A) Gas shutoff valve (Terminal B) Return
Table 2
Troubleshooting Test Steps    Values    Results    
1. Inspect the Electrical Connectors and the Wiring
A. Ensure that the electrical power has been removed from the engine.
B. Thoroughly inspect connectors (1) and (2). Also, inspect the connectors for solenoid (3). Refer to Testing and Adjusting, "Electrical Connectors - Inspect" for details.
C. Perform a
45 N (10 lb) pull test on each of the wires that are associated with the circuit for the GSOV.
D. Check the wiring harnesses for abrasion, for corrosion and for pinch points.
   
Connectors and Wiring
   
Result: The electrical connectors and the wiring are OK.
Proceed to Test Step 2.
Result: The electrical connectors and the wiring are Not OK.
Repair: Repair the connectors and/or the wiring. Replace parts, if necessary. Ensure that all of the seals are properly in place and ensure that the connectors are coupled. Verify that the problem is resolved.
   
2. Check for Diagnostic Codes that are Active or Logged
A. Remove the electrical power from the engine.
B. Connect Caterpillar Electronic Technician (ET) to the service tool connector. Refer to Troubleshooting, "Electronic Service Tools", if necessary.
C. Restore electrical power to the ECM. Set the engine control to STOP.
Note: The 632-5 Engine Fuel Shutoff Valve #1 : Current Below Normal can only be detected when the output for the start command is off. The output is normally off when the engine control is set to STOP and the engine speed is zero rpm.
D. Monitor the active