Paccar

PACCAR MX (2004 Emissions) Fault Code: P1090 Common Rail Fuel Pressure – Data Valid but Too High SET CONDITIONS:The PCI ECU (D420) detects that the measured rail pressure is more than 2840 bar [41191 psi]. DIAGNOSTIC CONDITION:This diagnostic runs when the rail pressure operating state is: Filling rail or Dumping. 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 common...

PACCAR MX (2004 Emissions) Fault Code: P1091 Common Rail Fuel Pressure – Data Erratic, Intermittent or Incorrect SET CONDITIONS:The PCI ECU (D420) detects that the controlled common rail pressure release valve current differs too much from the learned current during an autonomous test. DIAGNOSTIC CONDITION:This diagnostic runs every 30 minutes of engine operation when the following conditions are met for longer than 5 seconds:1. The engine has been running for more than 30 minutes and2. During a fuel injection cutoff event and3. Engine speed is between 1200 and 1600 rpm IMPORTANT: If the autonomous test passes it is repeated every...

PACCAR MX (2004 Emissions) Fault Code: P109C Common Rail Pressure Release Valve – Current Too Low or Open Circuit on ECU (D420) Pin (C4) POSSIBLE CAUSES:No repairs are necessary. ADDITIONAL INFORMATION:Do not troubleshoot this DTC.

PACCAR MX (2004 Emissions) Fault Code: P109D Common Rail Pressure Release Valve – Current Too High on ECU (D420) Pin (C4) DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. CORRESPONDING OBD READINESS MONITOR:None 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 ADDITIONAL INFORMATION:When this DTC is active:1. The engine torque is reduced.2. The engine runs in protection mode.3. The rail pressure control is in the limp-home function.4. The rail pressure is limited to approximately 800 bar....

PACCAR MX (2004 Emissions) Fault Code: P1105 Engine Protection System – Approaching Engine Shutdown SET CONDITIONS:This DTC becomes active if the DTC from which it originates has been active for a certain time. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC becomes inactive as soon as the DTC from which it originates has become inactive. 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 ADDITIONAL INFORMATION:IMPORTANT: Do not troubleshoot this DTC since it originates from another active DTC. 1. This...