41100-ZW1-712ZA Honda SEE PART DETAILS - PRI; CASE ASSY., GEAR (25") (Honda Code 5774666). *NH282MU* (UL-TYPE)

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 fuel, but the pressure sensor before the fuel valve still reads pressure. The code is logged.
The red stop lamp is illuminated.
The power to the GSOV remains in the de-energized state and the ECM inhibits cranking. 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. 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 controls the solenoid for the GSOV. This output is energize-to-run. When gas blending turns on, the ECM opens the GSOV. When gas blending turns off, the ECM closes the GSOV.
Illustration 1 g03380152
Schematic of the circuit for the GSOV.
Illustration 2 g03324932
Location of the connectors at the ECM
(1) J1/P1 ECM connectors
(2) J2/P2 ECM connectors
Illustration 3 g03380156
Location of the components for the GSOV
(3) Solenoid for the GSOV
(4) GSOV
Illustration 4 g03380159
P1 ECM connector
(P-61) - Battery
(P-63) - Battery
Illustration 5 g03324923
P2 ECM connector
(P2-5) GSOV
Illustration 6 g03324922
(Terminal 1) Sensor signal
(Terminal 2) Sensor return
Gaseous fuel is present. Personal Injury or Death can result from an open flame or spark igniting the gaseous fuel causing an explosion and/or fire. Always use a gas detector to determine the presence of gaseous fuel when maintaining and servicing. Contact your local gas provider immediately for assistance in the event of a leak.
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 diagnostic code and the logged diagnostic codes on Cat ET. Wait at least