Paccar

PACCAR MX (2004 Emissions) Fault Code: P2181 Engine Coolant Temperature – Does not Match Engine Operating Conditions SET CONDITIONS:The PCI ECU (D420) detects that the measured coolant temperature differs by more than 10°C [50°F] from the expected coolant temperature for more than 30 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. 150 seconds after an engine start2. When the ambient temperature is between -8 and 40°C [17 and 104°F]3. When the engine mode is DOC heating or DPF regeneration or SCR heating or SCR high efficiency or standard or protection CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive when the fault...

PACCAR MX (2004 Emissions) Fault Code: P2183 Engine Coolant Temperature – Data Erratic, Intermittent, or Incorrect SET CONDITIONS:The PCI ECU (D420) detects that the measured coolant temperature differs by more than 20°C [68°F] from the expected coolant temperature for more than 45 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. 150 seconds after an engine start and2. When the ambient temperature is above -8°C [17°F] and3. When the calculated coolant temperature is below 65°C [149°F] or above 85°C [185°F] and4. The engine mode is DOC heating or DPF regeneration or SCR heating or SCR high efficiency or standard or protection CORRESPONDING OBD READINESS...

PACCAR MX (2004 Emissions) Fault Code: P2199 Inlet Air Temperature Before Compressor – Data Erratic, Intermittent or Incorrect, at Ignition On SET CONDITIONS:The PCI ECU (D420) detects that the measured temperature reading of the humidity sensor differs more than 3°C [5.4°F] from the average of other temperature sensor readings on the engine for more than 5 seconds (after the ignition has been keyed off for at least 8 hours). DIAGNOSTIC CONDITION:This diagnostic runs:1. When the ignition has been keyed off continuously for at least 8 hours2. When the difference between the coolant temperature and ambient temperature is less than 15°C...

PACCAR MX (2004 Emissions) Fault Code: P2226 Internal ECU Ambient Pressure – Data Erratic, Intermittent or Incorrect, at Ignition On SET CONDITIONS:The PCI ECU (D420) detects that the measured ambient pressure differs by more than 0.06 bar [0.87 psi] from the average readings of other pressure sensors in the engine/aftertreatment system for more than 5 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. When the ignition is on and the engine is not running and2. When ambient temperature is above -20°C [-4°F] CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. REPAIR VERIFICATION:1. Clear all...

PACCAR MX (2004 Emissions) Fault Code: P2228 Internal ECU Ambient Pressure – Malfunction SET CONDITIONS:The PCI ECU (D420) detects that the internal ambient pressure sensor is faulty. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. CORRESPONDING OBD READINESS MONITOR:None 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 the vehicle to meet the diagnostic conditions and set conditions.3. Did the DTC come back?– No, repair successful– Yes, repair unsuccessful POSSIBLE CAUSES:Faulty pressure sensor, internally in ECU ADDITIONAL INFORMATION:The PCI ECU has an internal ambient pressure...