Paccar

Reason:
SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Position Sensor System – Received Network Data In Error. The OEM vehicle electronic control unit (VECU) detected a fault with the remote accelerator.

Effect:
Remote accelerator will not operate.

Circuit Description:
Normally, switches, accelerators, and other components are connected to the engine control module (ECM) directly through individual wires. Multiplexing allows those same components to be hard wired to an original equipment manufacturer (OEM) vehicle electronic control unit (VECU) or transmission electronic control unit (ECU) in the cab. Then component values and states from components such as sensors, accelerators, and switches can be transmitted from the OEM VECU to the Cummins® ECM over the SAE J1939 data link. Messages sent from OEM VECUs or transmission ECUs are received by the Cummins® ECM and used for controlling the engine. The Cummins® ECM and OEM VECU(s) must be configured properly, so that proper operation of the multiplexed components will occur.

Component Location:
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) received a message from the OEM VECU via the J1939 data link, indicating the remote throttle signal wire or enable switch was shorted high or shorted low.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
2) The multiplexed device will not operate.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
4) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
This fault can occur when the OEM VECU detects an error on the remote throttle and or remote throttle enable switch. The ECM has been set up properly (components enabled and OEM VECU source addressed correctly) to receive multiplexed information for the remote throttle enable switch states and remote accelerator position over the J1939 data link from an OEM VECU, and the OEM VECU is transmitting the message for that component. Most OEM VECUs will not have the circuitry to detect a remote throttle switch error.

The two types of errors that can occur for this fault are:
1) The OEM VECU determines that the remote throttle signal line is shorted high or shorted low. This fault status is transmitted to the Cummins® ECM on the J1939 data link, which causes this fault to occur in the Cummins® ECM.
2) When the remote throttle enable switch has a shorted high or shorted low error detected by the OEM VECU, this fault status is transmitted to the ECM on the J1939 data link, which causes this fault to occur in the ECM. Most OEM VECUs will not incorporate fault detection on a switch.

NOTE: It is still possible to get a Fault Code 285 or 286, if there is an incorrect setup in the OEM VECU or Cummins® ECM for other components, or the remote throttle and remote throttle switch, or the data link is damaged. The OEM configurations must multiplex the remote throttle and remote throttle switch inputs together to allow the use of the J1939 multiplexing feature for these components. The INSITE™ electronic service tool can be used to monitor multiplexed components

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

Possible Causes:
1) Inactive fault codes
2) Bad remote throttle switch, remote throttle, or the OEM VECU

Reason:
SAE J1939 Multiplexing Remote Accelerator Pedal or Lever Position Sensor System – Received Network Data In Error. The OEM vehicle electronic control unit (VECU) detected a fault with the remote accelerator.

Effect:
Remote accelerator will not operate.

Circuit Description:
Normally, switches, accelerators, and other components are connected to the engine control module (ECM) directly through individual wires. Multiplexing allows those same components to be hard wired to an original equipment manufacturer (OEM) vehicle electronic control unit (VECU) or transmission electronic control unit (ECU) in the cab. Then component values and states from components such as sensors, accelerators, and switches can be transmitted from the OEM VECU to the Cummins® ECM over the SAE J1939 data link. Messages sent from OEM VECUs or transmission ECUs are received by the Cummins® ECM and used for controlling the engine. The Cummins® ECM and OEM VECU(s) must be configured properly, so that proper operation of the multiplexed components will occur.

Component Location:
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) received a message from the OEM VECU via the J1939 data link, indicating the remote throttle signal wire or enable switch was shorted high or shorted low.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
2) The multiplexed device will not operate.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
4) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
This fault can occur when the OEM VECU detects an error on the remote throttle and or remote throttle enable switch. The ECM has been set up properly (components enabled and OEM VECU source addressed correctly) to receive multiplexed information for the remote throttle enable switch states and remote accelerator position over the J1939 data link from an OEM VECU, and the OEM VECU is transmitting the message for that component. Most OEM VECUs will not have the circuitry to detect a remote throttle switch error.

The two types of errors that can occur for this fault are:
1) The OEM VECU determines that the remote throttle signal line is shorted high or shorted low. This fault status is transmitted to the Cummins® ECM on the J1939 data link, which causes this fault to occur in the Cummins® ECM.
2) When the remote throttle enable switch has a shorted high or shorted low error detected by the OEM VECU, this fault status is transmitted to the ECM on the J1939 data link, which causes this fault to occur in the ECM. Most OEM VECUs will not incorporate fault detection on a switch.

NOTE: It is still possible to get a Fault Code 285 or 286, if there is an incorrect setup in the OEM VECU or Cummins® ECM for other components, or the remote throttle and remote throttle switch, or the data link is damaged. The OEM configurations must multiplex the remote throttle and remote throttle switch inputs together to allow the use of the J1939 multiplexing feature for these components. The INSITE™ electronic service tool can be used to monitor multiplexed components

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

Possible Causes:
1) Inactive fault codes
2) Bad remote throttle switch, remote throttle, or the OEM VECU

Reason:
Aftertreatment Fuel Pressure Sensor – Data Valid But Below Normal Operational Range – Least Severe Level. Low fuel pressure has been detected in the aftertreatment fuel system.

Effect:
None on performance

Circuit Description:
The aftertreatment fuel pressure sensor is used to monitor the fuel pressure into the aftertreatment system. The engine control module (ECM) supplies the aftertreatment fuel pressure sensor a 5 volt reference voltage. When the fuel pressure is low, the sensor signal voltage is low. When the fuel pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the aftertreatment fuel pressure signal circuit voltage to calculate the pressure of the fuel within the aftertreatment system.

Component Location:
The aftertreatment fuel injector is installed in the exhaust system in the turbocharger adapter pipe. The aftertreatment fuel pressure sensor and aftertreatment fuel shutoff valve are installed in the shutoff valve manifold. The aftertreatment purge air actuator is located above the shutoff valve manifold.

Conditions for Running the Diagnostics:
This diagnostic runs during active regeneration of the aftertreatment diesel particulate filter.

Conditions for Setting the Fault Codes:
The aftertreatment fuel pressure was less than 300 kPa [43.5 psi] for more than 15 seconds.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) Active regeneration of the aftertreatment diesel particulate filter will be disabled unitl the next key cycle.
3) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and perform the INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
N/A

Possible Causes:
1) Plugged or restricted aftertreatment fuel supply line
2) Plugged or restricted aftertreatment fuel shutoff manifold
3) Plugged or restricted pressure side fuel filter
4) Malfunctioning fuel pump gear pump

Reason:
Aftertreatment Fuel Pressure Sensor – Data Valid But Below Normal Operational Range – Least Severe Level. Low fuel pressure has been detected in the aftertreatment fuel system.

Effect:
None on performance

Circuit Description:
The aftertreatment fuel pressure sensor is used to monitor the fuel pressure into the aftertreatment system. The engine control module (ECM) supplies the aftertreatment fuel pressure sensor a 5 volt reference voltage. When the fuel pressure is low, the sensor signal voltage is low. When the fuel pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the aftertreatment fuel pressure signal circuit voltage to calculate the pressure of the fuel within the aftertreatment system.

Component Location:
The aftertreatment fuel injector is installed in the exhaust system in the turbocharger adapter pipe. The aftertreatment fuel pressure sensor and aftertreatment fuel shutoff valve are installed in the shutoff valve manifold. The aftertreatment purge air actuator is located above the shutoff valve manifold.

Conditions for Running the Diagnostics:
This diagnostic runs during active regeneration of the aftertreatment diesel particulate filter.

Conditions for Setting the Fault Codes:
The aftertreatment fuel pressure was less than 300 kPa [43.5 psi] for more than 15 seconds.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) Active regeneration of the aftertreatment diesel particulate filter will be disabled unitl the next key cycle.
3) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and perform the INSITE™ electronic service tool Aftertreatment Diesel Particulate Filter Regeneration Test.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
5) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
N/A

Possible Causes:
1) Plugged or restricted aftertreatment fuel supply line
2) Plugged or restricted aftertreatment fuel shutoff manifold
3) Plugged or restricted pressure side fuel filter
4) Malfunctioning fuel pump gear pump

Reason:
Proprietary Data Link Error (OEM/Vehicle Data Link) – Abnormal Update Rate. The immobilizer anti-theft system will not operate properly. The engine could possibly not start.

Effect:
The immobilizer anti-theft system will not operate properly. The engine could possibly not start.

Circuit Description:
The immobilizer anti-theft device is connected to the primary engine electronic control module (ECM) through a J1939 data link network. Messages sent from the immobilizer anti-theft device are received by the Cummins® ECM and are used to control the anti-theft features. The Cummins® ECM and immobilizer anti theft device must be configured properly so that proper operation of the multiplexed components will occur.

Component Location:
The SAE J1939 data link wiring and the SAE J1939 devices vary by OEM options.

Conditions for Running the Diagnostics:
The diagnostic runs continuously when the keyswitch in in the ON position.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) was not able to communicate with the immobilizer anti-theft system via the J1939 data link

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Shop Talk:
When the ECM is set up to receive information from an OEM device, but the OEM device is not be transmitting the message for that component. Or when a multiplexed component is enabled in the Cummins® ECM, but the source address of the OEM device transmitting the component message is incorrect in the Cummins® ECM.

Possible Causes:
1) Bad service data link
2) Open or short on the service data link
3) Faulty OEM harness
4) Inactive fault codes

Reason:
Auxiliary Temperature Sensor Input 1 – Special Instructions. The original equipment manufacturer (OEM) auxiliary temperature sensor input has exeeded an OEM calibrated limit.

Effect:
Engine power derate.

Circuit Description:
The original equipment manufacturer (OEM) has the option of wiring a temperature sensor input to the Cummins® engine control module (ECM). This input is intended for a variable resistance temperature sensor.

Component Location:
The OEM temperature sensor input and location will vary. Refer to the OEM service manual for sensor location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the OEM temperature sensor exceeded the engine protection limit.

Action Taken When the Fault Code is Active:
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
This fault code is activated when the temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. An engine power derate is possible depending on the OEM application.

Possible Causes:
1) Inactive fault codes
2) Faulty ECM

Reason:
Auxiliary Temperature Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the Original Equipment Manufacturer (OEM) auxiliary temperature circuit.

Effect:
None on performance

Circuit Description:
The OEM has the option of wiring a temperature sensor input to the Cummins® ECM. A specific calibration is then created to recognize this temperature sensor input.

Component Location:
The OEM temperature sensor input and location will vary. Refer to the OEM service manual for sensor location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the OEM temperature sensor circuit is open or shorted high.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
N/A

Possible Causes:
1) Open return circuit in the harness, connectors, or sensor
2) Open signal circuit or shorted to a voltage source

Reason:
Auxiliary Temperature Sensor Input 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the OEM auxiliary temperature circuit.

Effect:
None on performance

Circuit Description:
The original equipment manufacturer (OEM) has the option of wiring a temperature sensor input to the Cummins® engine control module (ECM). This input is intended for a variable resistance temperature sensor.

Component Location:
The OEM temperature sensor input and location will vary. Refer to the OEM service manual for sensor location.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the OEM temperature signal circuit is out of range low.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine and let it idle for 1 minute.
2) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
3) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
N/A

Possible Causes:
1) Signal shorted to ground in the harness
2) Signal shorted to return or ground in the sensor

Reason:
Barometric Pressure – Data Erratic, Intermittent, or Incorrect. An error in the barometric pressure sensor signal was detected by the ECM.

Effect:
Possible reduced engine performance.

Circuit Description:
The barometric pressure sensor responds to pressure changes in the atmospheric pressure. The pressure changes occur based on the elevation where the engine is presently operating. The barometric pressure sensor has a 5 volt supply circuit, a sensor signal voltage, and a return circuit.

Component Location:
The barometric pressure sensor is mounted on the main branch of the engine harness near the ECM.

Conditions for Running the Diagnostics:
1) The first part of the diagnostic runs continuously while the keyswitch is in the ON posistion or the engine is running.
2) The second part of the diagnostic runs at key OFF.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the barometric pressure reading was higher or lower than the other absolute pressure sensors on the engine, or an in-range malfunction of the sensor was detected.

Action Taken When the Fault Code is Active:
1) The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
2) A default value for the barometric pressure reading is used.
3) Exhaust Gas Recirculation (EGR) valve operation will be disabled.
4) Diesel exhaust fluid injection into the aftertreatment system is disabled.
5) Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

Conditions for Clearing the Fault Code:
1) To validate the repair, start the engine, let it idle for 1 minute, and then shutdown the engine.
2) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
3) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
N/A

Possible Causes:
1) A malfunctioning barometric air pressure sensor