Paccar

PACCAR MX (2004 Emissions) Fault Code: P1053 Speed Functions Off Switch – Data Erratic, Intermittent, or Incorrect SET CONDITIONS:The PCI ECU (D420) detects that both the variable speed limiter activation and deactivation switches are active at the same time. 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:Mechanical failure or...

PACCAR MX (2004 Emissions) Fault Code: P1054 Downhill Speed Control Switches – Data Erratic, Intermittent or Incorrect SET CONDITIONS:The PCI ECU (D420) detects that both the downhill speed control activation and deactivation switches are active at the same time. 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:Mechanical failure or...

PACCAR MX (2004 Emissions) Fault Code: P1055 Retarder Switches – Data Erratic, Intermittent, or Incorrect SET CONDITIONS:The PCI ECU (D420) receives a CAN message with an invalid position of the retarder switch. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. POSSIBLE CAUSES:Mechanical failure or damage to the retarder switch ADDITIONAL INFORMATION:The retarder is a wear-resistant continuous brake. It is primarily intended for use in prolonged braking, for example when decelerating from high speed on a level road or when driving downhill.

PACCAR MX (2004 Emissions) Fault Code: P1057 Exhaust Gas Pressure Before Turbine – Data Valid but Too Low SET CONDITIONS:The PCI ECU (D420) detects that measured pressure before turbine is lower than the expected pressure before turbine for more than 50 seconds. DIAGNOSTIC CONDITION:This diagnostic runs:1. Engine speed is between 1000 and 1700 rpm and2. Engine is running at a steady load and3. Coolant temperature is above 50?C [122?F] and4. the engine mode is SCR high efficiency or standard or protection CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. REPAIR VERIFICATION:1....

PACCAR MX (2004 Emissions) Fault Code: P1058 Inlet Air Pressure in Inlet Manifold – Data Valid but Too Low SET CONDITIONS:The PCI ECU (D420) detects that the boost pressure is lower than expected. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the following is true:1. The engine is operating at a steady load, with a minimum actual fuel quantity of 175 mg/stroke2. The engine is running in one of the following engine modes: ‘Standard’, ‘SCR high efficiency’ or ‘SCR super high efficiency’ CORRESPONDING OBD READINESS MONITOR:VTG monitor RESET CONDITION:This DTC will change to inactive after the diagnostic runs and passes. REPAIR VERIFICATION:1....