Paccar

PACCAR MX (2004 Emissions) Fault Code: U1049 VTG Turbocharger Actuator Position – Incorrect SET CONDITIONS:The VTG turbocharger actuator (L037) detects:1. A difference between the required and actual actuator motor position of more than 8.9% for more than 35 seconds with2. An actuator effort of more than 38% with3. An actuator temperature of more than 5°C DIAGNOSTIC CONDITION:This diagnostic runs continuously when the engine is not in SCR heating mode. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC will change to inactive immediately after the diagnostic runs and passes. REPAIR VERIFICATION:1. Clear all DTCs.2. Test drive or operate the vehicle to meet...

PACCAR MX (2004 Emissions) Fault Code: U104C VTG Turbocharger Actuator – CAN Communication Error SET CONDITIONS:The VTG turbo charger actuator (L037) detects that the cyclic CAN command message transmitted by the PCI ECU (D420) is missing. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC will change to inactive immediately after the diagnostic runs and passes. REPAIR VERIFICATION:1. Clear all DTCs.2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.3. Did the DTC come back?– No, repair successful– Yes, repair unsuccessful POSSIBLE CAUSES:1. Communication error between actuator...

PACCAR MX (2004 Emissions) Fault Code: U1069 Inlet Air Pressure Before Compressor – Data Erratic, Intermittent or Incorrect SET CONDITIONS:The PCI ECU (D420) receives a CAN message from the humidity sensor (F852) that contains an out-of-range value for the pressure. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive after the ignition is keyed off for at least 15 seconds and keyed on again, and the fault is no longer detected. REPAIR VERIFICATION:1. Clear all DTCs.2. Test drive or operate the vehicle to meet the diagnostic conditions and set...

PACCAR MX (2004 Emissions) Fault Code: U1070 CAN Communication – Message (AMB) Out of Range Ambient Temperature from Vehicle Control System SET CONDITIONS:This DTC is set when a CAN message is received correctly, but the content (signal value or status) is out of the expected range. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is turned on or when the engine is running. RESET CONDITION:The DTC changes to inactive after the diagnostic runs and passes. POSSIBLE CAUSES:1. A corrupt or empty CAN message2. A malfunction in the system from which the message originates ADDITIONAL INFORMATION:1. A ‘message out of range’...

PACCAR MX (2004 Emissions) Fault Code: U1071 Inlet Air Humidity Before Compressor – Data Erratic, Intermittent or Incorrect SET CONDITIONS:The PCI ECU (D420) receives a CAN message from the humidity sensor (F852) that contains an out-of-range value for the relative humidity. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive after the ignition is keyed off for at least 15 seconds and keyed on again, and the fault is no longer detected. REPAIR VERIFICATION:1. Clear all DTCs.2. Test drive or operate the vehicle to meet the diagnostic conditions and...