Paccar

PACCAR MX (2004 Emissions) Fault Code: P1718 EGR Mass Flow – Data Valid but Too High SET CONDITIONS:The PCI ECU (D420) detects that the EGR mass flow is too high for more than 90 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is between 1000 and 1900 rpm and2. When the engine is running at a steady load and3. The engine mode is SCR high-efficiency mode or standard mode and4. The NOx sensor before catalyst (F844) is in the operating mode CORRESPONDING OBD READINESS MONITOR:EGR system monitor RESET CONDITION:This DTC changes to inactive when the fault is no longer...

PACCAR MX (2004 Emissions) Fault Code: P1719 EGR Mass Flow – Data Valid but Too Low SET CONDITIONS:1. The PCI ECU (D420) detects that the EGR mass flow is too low for more than 90 seconds.2. This DTC is set based on a one or two trip detection logic, depending on the PCI software version. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is between 1000 and 1900 rpm and2. When the engine is running at a steady load and3. The engine mode is SCR high-efficiency mode or standard mode and4. The NOx sensor before catalyst (F844) is in the...

PACCAR MX (2004 Emissions) Fault Code: P171B EGR Flow Response – Decrease too Slow SET CONDITIONS:The PCI ECU (D420) detects that the EGR mass flow decrease is too slow during changes in the commanded EGR mass flow from a high to low rate. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is more than 1000 rpm and2. The engine mode is DPF regeneration or SCR heating or SCR high efficiency or standard. CORRESPONDING OBD READINESS MONITOR:EGR system monitor RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. REPAIR VERIFICATION:1. Clear all DTCs.2. Test drive or operate...

PACCAR MX (2004 Emissions) Fault Code: P171C EGR Flow Response – Increase Too Slow SET CONDITIONS:The PCI ECU (D420) detects that the EGR mass flow increase is too slow during changes in the commanded EGR mass flow from a low to high rate. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is between 1000 and 1450 rpm and2. The engine mode is DPF regeneration or SCR heating or SCR high efficiency or standard CORRESPONDING OBD READINESS MONITOR:EGR system monitor RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. REPAIR VERIFICATION:1. Clear all DTCs.2. Test drive or...

PACCAR MX (2004 Emissions) Fault Code: P171E Air Mass Flow – Data Valid but Too High SET CONDITIONS:The PCI ECU (D420) detects that, at a boost pressure, the calculated inlet air mass flow is lower than the expected inlet air mass flow for more than 50 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is between 1000 and 1850 rpm and2. When the engine is running at a steady load and3. When the coolant temperature is above 50°C [122°F] and4. The engine mode is SCR high efficiency or standard RESET CONDITION:This DTC changes to inactive when the fault is...