0583602 JOHNSON MOTOR CABLE ASSY.

Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
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 Electronic Control Module (ECM). The code is logged.
The alarm output is activated.
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. 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 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:
Specific gravity of the fuel
Specific Heat Ratio of the fuel
Desired fuel flow rateThe 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 a 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. If the engine is running and using the PWM signal when the 1446-8 code is set the fuel metering valve will look to the CAN data link. If the signal is not available on the CAN data link the engine will shut down.Note: If an open circuit is suspected in the circuit between the power supply and the powered component also inspect the power distribution box for the following conditions:
Abrasion of the insulation on the wiring within the box
Damage to the posts for the wiring to the circuit breakers
Damage to the internal parts of the circuit breakersThose conditions can contribute to the following difficulties with operation:
Unstable engine performance
Interruption of communication between the engine ECM, the fuel metering valve, the actuator for the compressor bypass, and the throttle actuator
Intermittent loss of power to the ECM
Intermittent diagnostic codes for conditions such as engine overspeed and lack of communication between electronic components
Unexpected engine shutdown
Illustration 1 g02310774
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.
Thoroughly inspect all connectors, wiring, and terminations for fuel metering valve circuit. Refer to Troubleshooting, "Electrical Connectors - Inspect".
Illustration 2 g01767353
Terminal connections at the P1 connector that are for the fuel metering valve
(P1-34) CAN data link −
(P1-42) CAN shield
(P1-50) CAN data link +
(P1-58) Fuel command (PWM)
(P1-60) Return
Illustration 3 g02150201
Terminal connections at the harness connector for the fuel metering valve
(Terminal F) Keyswitch
(Terminal K) Fuel command (PWM)
(Terminal L) Return
(Terminal T) CAN data link +
(Terminal U) CAN data link −
(Terminal V) CAN shield
(Terminal W) +Battery
(Terminal Y) Shield
(Terminal Z) −Battery
Perform a 45 N (10 lb) pull test on each of the wires in the circuit for the fuel metering valve.
Check the torque of the allen head screws for each of the ECM connectors and of the engine interface connector. Refer to Troubleshooting, "Electrical Connectors - Inspect" for the correct torque values.Expected Result:All connectors, pins, and sockets are connected properly. The connectors and the wiring do not have corrosion, abrasion, or pinch points.Results:
OK - The connectors, wiring, and fuses appear to be OK. Proceed to Test Step 2.
Not OK - The connectors, wiring, circuit breakers, and fuses are not OK.Repair: Repair the problem. Replace parts, if necessary. Verify that the repair has eliminated the original problem.STOPTest Step 2. Check for Diagnostic Codes
Connect the Caterpillar Electronic Technician (ET) to the service tool connector.
Restore the electrical power to the engine. Set the engine control switch to the STOP position.
Use the "Active Diagnostic" screen on Cat ET. Look for these codes:Note: Monitor the active diagnostic code and the logged diagnostic codes on Cat ET. Wait at least 30 seconds in order for diagnostic codes to become active.
1446-8
1446-9
1446-12
1446-13
1447-12Results:
OK - There are no active diagnostic codes.Repair: The signal and the communication between the ECM and the fuel metering valve appear to be OK at this time. If one of these codes is logged, there may be an intermittent problem with one of the circuits. If there is a logged code, or an intermittent electrical problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems.STOP
Active 1446-8 - The problem may be in the circuit for the PWM signal between the ECM and the fuel metering valve. Proceed to Test Step