Paccar

PACCAR MX (2004 Emissions) Fault Code: P0493 Fan Speed Control – Incorrect SET CONDITIONS:The PCI ECU (D420) detects that the actual fan speed is higher than expected. DIAGNOSTIC CONDITION:This diagnostic runs every 300 seconds:1. When the engine has been running for more than 300 seconds2. When the engine speed is greater than 1000 rpm3. When the coolant temperature is above 70°C [158°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 DTCs.2. Test drive or operate the vehicle to meet the diagnostic conditions and set conditions.3. Did the...

PACCAR MX (2004 Emissions) Fault Code: P0501 Vehicle Speed Sensor – Data Erratic, Intermittent, or Incorrect SET CONDITIONS:The PCI ECU (D420) detects that the measured vehicle speed is unlikely. DIAGNOSTIC CONDITION:This diagnostic runs:1. When engine speed is above 900 rpm and2. The engine speed changes more than 300 rpm in a period of more than 90 seconds and3. Engine torque changes in a period of more than 90 seconds 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...

PACCAR MX (2004 Emissions) Fault Code: P0502 Vehicle Speed Sensor – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (B40) SET CONDITIONS:This DTC is set when the ECU detects a lower voltage than expected on the signal or control circuit of the ECU. DIAGNOSTIC CONDITION:The diagnostic runs continuously when the ignition is keyed on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:The DTC changes to inactive after the diagnostic runs and passes. 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...

PACCAR MX (2004 Emissions) Fault Code: P0503 Vehicle Speed Sensor – Out of Range SET CONDITIONS:The PCI ECU (D420) detects that the measured vehicle speed is higher than 140 km/h [87 mph]. DIAGNOSTIC CONDITION:This diagnostic runs continuously after ignition is keyed 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:1. Driving at high speed (e.g., downhill)2. Faulty vehicle speed...

PACCAR MX (2004 Emissions) Fault Code: P0513 Immobilizer – Not Matched SET CONDITIONS:The PCI ECU (D420) detects that the vehicle key code is not received or is incorrect. DIAGNOSTIC CONDITION:This diagnostic runs once after the ignition is keyed on. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:This DTC will change to inactive immediately after the diagnostic runs and passes. 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:1. A temporary communication error between the immobilizer system and the PCI...