Paccar

PACCAR MX (2004 Emissions) Fault Code: P0303 Cylinder 3 – Contribution Too Low or Misfire SET CONDITIONS:The PCI ECU (D420) detects that cylinder 3 is misfiring or the combustion contribution is lower relative to the other cylinders. DIAGNOSTIC CONDITION:This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady. CORRESPONDING OBD READINESS MONITOR:Misfire 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 the vehicle to meet the following conditions:– Corresponding readiness monitor displays ‘Ready’– Diagnostic conditions are...

PACCAR MX (2004 Emissions) Fault Code: P0304 Cylinder 4 – Contribution Too Low or Misfire SET CONDITIONS:The PCI ECU (D420) detects that cylinder 4 is misfiring or the combustion contribution is lower relative to the other cylinders. DIAGNOSTIC CONDITION:This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady. CORRESPONDING OBD READINESS MONITOR:Misfire 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 the vehicle to meet the following conditions:– Corresponding readiness monitor displays ‘Ready’– Diagnostic conditions are...

PACCAR MX (2004 Emissions) Fault Code: P0305 Cylinder 5 – Contribution Too Low or Misfire SET CONDITIONS:The PCI ECU (D420) detects that cylinder 5 is misfiring or the combustion contribution is lower relative to the other cylinders. DIAGNOSTIC CONDITION:This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady. CORRESPONDING OBD READINESS MONITOR:Misfire 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 the vehicle to meet the following conditions:– Corresponding readiness monitor displays ‘Ready’– Diagnostic conditions are...

PACCAR MX (2004 Emissions) Fault Code: P0306 Cylinder 6 – Contribution Too Low or Misfire SET CONDITIONS:The PCI ECU (D420) detects that cylinder 6 is misfiring or the combustion contribution is lower relative to the other cylinders. DIAGNOSTIC CONDITION:This diagnostic runs when the engine is running at a steady speed and load, and the vehicle speed is steady. CORRESPONDING OBD READINESS MONITOR:Misfire 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 the vehicle to meet the following conditions:– Corresponding readiness monitor displays ‘Ready’– Diagnostic conditions are...

PACCAR MX (2004 Emissions) Fault Code: P0315 Cylinder Unbalance – Detected SET CONDITIONS:The PCI ECU (D420) detects an imbalance for more than 500 crankshaft revolutions. DIAGNOSTIC CONDITION:This diagnostic runs 30 seconds after the engine has started and when the engine is running at a steady speed and load between 600 and 1900 rpm. RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. To validate the repair, drive the vehicle until the coolant temperature is at least 70°C [158°F]. Once the minimum target temperature has been reached, perform several low to higher speed accelerations with moderate engine...