Paccar

PACCAR MX (2004 Emissions) Fault Code: U1855 Catalytic Convertor Temperature Sensors ECU Software Verification – Incorrect SET CONDITIONS:The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the catalytic convertor temperature sensors ECU. DIAGNOSTIC CONDITION:This diagnostic runs once when the ignition is keyed on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive next time the ignition is keyed on 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 conditions.3. Did the DTC come back? (Can be...

PACCAR MX (2004 Emissions) Fault Code: U1856 DOC DPF Temperature Sensors ECU Software Verification – Incorrect SET CONDITIONS:The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the DOC/DPF temperature sensors ECU. DIAGNOSTIC CONDITION:This diagnostic runs once when the ignition is keyed on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive next time the ignition is keyed on 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 conditions.3. Did the DTC come back? (Can be pending,...

PACCAR MX (2004 Emissions) Fault Code: U1857 Humidity Sensor Software Verification – Incorrect SET CONDITIONS:The PCI ECU detects that no or an incorrect calibration verification number (CVN) is received from the humidity sensor. DIAGNOSTIC CONDITION:This diagnostic runs once when the ignition is keyed 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 conditions.3. Did the DTC come back?...

PACCAR MX (2004 Emissions) Fault Code: U1858 A Fault Exists With the DECECU 11 CVN Calculation SET CONDITIONS:This DTC is set when a CAN message is received correctly, but the content (signal value or status) is not available. DIAGNOSTIC CONDITION:The diagnostic runs continuously when the ignition is keyed on. RESET CONDITION:The DTC changes to inactive after the diagnostic runs and passes. POSSIBLE CAUSES:A malfunction in the system from which the message originates. PACCAR MX (2004 Emissions) Fault Code: U1857 Humidity Sensor Software Verification – Incorrect PACCAR MX (2004 Emissions) Fault Code: U1856 DOC DPF Temperature Sensors ECU Software Verification –...

PACCAR MX (2004 Emissions) Fault Code: U185A CAN – Message (A1DEFI) Time-Out from Aftertreatment System SET CONDITIONS:This DTC is set when the repetition rate of the received CAN message is lower than expected or when the message is not received at all. DIAGNOSTIC CONDITION:The diagnostic runs continuously when the ignition is keyed on or when the engine is running. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:The DTC changes to inactive 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,...