0327851 JOHNSON APPLIQUE

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
1446-5 Fuel Metering Module : Current Below Normal The fuel metering valve has detected an excessive current in the circuit for the Pulse Width Modulated signal (PWM signal). The problem was reported to the Electronic Control Module (ECM) over the CAN data link. The code is logged.
The alarm output is activated.
1446-8 Fuel Metering Module : Abnormal Frequency, Pulse Width, or Period The fuel metering valve has detected an error in the PWM signal that is from the ECM.
1446-9 Fuel Metering Module : Abnormal Update Rate The ECM has not received the last ten messages that were expected from the fuel metering valve over the CAN data link.
1446-12 Fuel Metering Module : Failure After the ECM has been powered for 5 seconds, the fuel metering valve has reported that an internal fault has occurred . The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
1446-13 Fuel Metering Module : Calibration Required After the ECM has been powered for 5 seconds, the fuel metering valve has reported that a calibration is necessary for the valve. The code is logged.
The alarm output is activated.
1447-12 Fuel Metering Sensor Module : Failure The fuel metering valve has detected an internal failure of the sensor module. The problem was reported to the ECM over the CAN data link. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
1835-3 Auxiliary Pressure Sensor : Voltage Above Normal The change in pressure across the metering valve is higher than allowed. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
1835-4 Auxiliary Pressure Sensor : Voltage Below Normal The change in pressure across the metering valve is lower than allowed. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
1835-12 Auxiliary Pressure Sensor : Failure The fuel metering valve has detected an error at the internal pressure sensors. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down.
1836-12 Auxiliary Temperature Sensor : Failure The fuel metering valve has detected an error at the internal temperature sensors. The code is logged.
The alarm output is activated.
The shutdown output is activated.
The engine is shut down. The fuel metering valve is an electronic gas valve that controls the flow of fuel to the engine. The valve works with the engine ECM in order to ensure the correct flow of gas in all conditions of engine operation.The ECM sends the desired fuel flow and specific gravity of the gas to the fuel metering valve. The valve converts the command signal and the information into a valve position that directly corresponds to the desired gas flow. The position of the valve is compensated by these additional factors that are internal to the valve: .
A signal for absolute fuel pressure
Differential pressure across the valve
Fuel temperature sensorsCommunicationsThe ECM sends the following information to the fuel metering valve via the CAN data link:
The specific gravity of the fuel
PWM signal for desired fuel flowThe fuel metering valve sends the following information to the ECM via the CAN data link:
Position of the fuel valve
Absolute fuel pressure
Differential pressure across the valve
Fuel temperatureIf the ECM and the fuel metering valve cannot communicate via the CAN data link, a 1446-9 diagnostic code is activated. If the engine is running, the fuel metering valve will use the command signal from the PWM signal. The engine will continue to run. However, if the engine is not running and a 1446-9 diagnostic code becomes active, the ECM will not allow the engine to start.PWM SignalThe ECM sends the command signal for the fuel flow via a PWM signal. If the PWM signal for the flow of fuel is interrupted, a 1446-8 diagnostic code will be activated. The fuel metering valve will use the command signal for the fuel flow via the CAN data link.Pressure CodesCycle the battery power and ensure that the GSOV is operating properly. If the code remains and fuel is not present at the fuel metering valve, replace the fuel metering valve.
Illustration 1 g02148064
Schematic for the components that are related to the fuel metering valve
Test Step 1. Inspect the Electrical Connectors and the Wiring
Set the engine control switch to the OFF/RESET position. Remove the electrical power from the engine.
Illustration 2 g01716014
Location of the fuel metering valve (left side engine view)
(1) Fuel metering valve
Illustration 3 g01766874
Locations of the connectors at the ECM junction box that are for the fuel metering valve
(2) J1/P1 ECM connectors
(3) Control harness connector for the wiring to the fuel metering valve
Illustration 4 g01766913
Locations of the connectors at the engine junction box that are for the fuel metering valve
(4) Power harness connector at the engine junction box
(5) Engine interface connector at the engine junction box
(6) Interconnect harness connectors
Illustration 5 g01767313
Connections at the engine junction box that are for the fuel metering valve (left side engine view)
(F5) 10 amp fuse for the fuel metering valve
Thoroughly inspect the harness connectors for fuel metering valve (1). Also, thoroughly inspect the condition of connectors (2), (3), (4), (5), and (6). Check fuse (F5) for good repair. Ensure that the power connections that are for the terminal strip in the engine junction box are tight and free of corrosion. Refer to Troubleshooting, "Electrical Connectors - Inspect".