Paccar

PACCAR MX (2004 Emissions) Fault Code: P1709 Lambda – Data Valid but Too Low During Overrun SET CONDITIONS:The PCI ECU (D420) detects that the measured oxygen concentration in the exhaust is too low while coasting (fuel injection cut off) for more than 21 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. During coasting (no fuel injection) and2. When the coolant temperature is above 50°C [122°F] and3. The lambda sensor (F834) is in the operating mode (if applicable) CORRESPONDING OBD READINESS MONITOR:Exhaust gas sensors monitor RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. REPAIR VERIFICATION:1. Clear all DTCs.2. Test...

PACCAR MX (2004 Emissions) Fault Code: P170A Lambda – Data Valid but Too Low, Most Severe SET CONDITIONS:The PCI ECU (D420) detects that the air/fuel ratio is too low for more than 40 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is between 950 and 2000 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 or protection5. The lambda sensor (F834) is in the operating mode (if applicable) CORRESPONDING OBD READINESS MONITOR:Exhaust gas sensors monitor RESET CONDITION:This DTC...

PACCAR MX (2004 Emissions) Fault Code: P170B Lambda – Data Valid but Too High, Most Severe SET CONDITIONS:The PCI ECU (D420) detects that the air/fuel ratio is too high for more than 40 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is between 950 and 2000 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 or protection5. The lambda sensor (F834) is in the operating mode (if applicable) CORRESPONDING OBD READINESS MONITOR:Exhaust gas sensors monitor RESET CONDITION:This DTC...

PACCAR MX (2004 Emissions) Fault Code: P170C NOx Sensor before Catalyst Response – Data Erratic, Intermittent or Incorrect, During Overrun SET CONDITIONS:The PCI ECU (D420) detects that the measured engine NOx emissions differ too much from the expected engine NOx emissions after 3 seconds during coasting (fuel injection cutoff). DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine speed is above 1200 rpm and2. During coasting (no fuel injection) and3. When the coolant temperature is above 50°C [122°F] and4. The NOx sensor before catalyst (F844) is in the operating mode CORRESPONDING OBD READINESS MONITOR:Exhaust gas sensors monitor RESET CONDITION:This DTC changes to...

PACCAR MX (2004 Emissions) Fault Code: P170D NOx Sensor Before Catalyst Response – Incorrect SET CONDITIONS:The PCI ECU (D420) detects that measured engine NOx emissions differ too much from the expected engine NOx emissions during transient operation of the engine (expected increase of NOx emissions). DIAGNOSTIC CONDITION:This diagnostic runs:1. When the engine is running at a steady load and its speed is between 1200 and 1700 rpm and2. The coolant temperature is above 50°C [122°F] and3. The engine mode is DOC heating or DPF regeneration or SCR heating or SCR high efficiency or standard or protection and4. The NOx sensor...