Paccar

PACCAR MX (2004 Emissions) Fault Code: P0118 Engine Coolant Temperature – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A58) SET CONDITIONS:This DTC is set when the ECU detects a higher 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: P011A Coolant Pump Speed – Stalled Pump Detected SET CONDITIONS:The PCI ECU (D420) detects that the coolant pump speed is below 340 rpm for more than 0.5 seconds. DIAGNOSTIC CONDITION:This diagnostic runs continuously when the engine is running. 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. Broken or missing poly-V belt2. Slipping poly-V-belt...

PACCAR MX (2004 Emissions) Fault Code: P0121 Accelerator Pedal – Sticking Pedal SET CONDITIONS:The PCI ECU (D420) detects that both the accelerator pedal and foot brake pedal are depressed for greater than 10 seconds. 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. Malfunction on the accelerator pedal2. Malfunction on...

PACCAR MX (2004 Emissions) Fault Code: P0127 Intercooler Temperature – Data Valid but Too High, Most Severe SET CONDITIONS:The PCI ECU (D420) detects that the intercooler outlet temperature is more than 100°C [212°F] for more than 30 seconds. DIAGNOSTIC CONDITION:This diagnostic runs 300 seconds after the engine is started. 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. Restricted air...

PACCAR MX (2004 Emissions) Fault Code: P0135 Lambda Sensor Heater – Current Too Low or Open Circuit on ECU (D420) Pin (C46) SET CONDITIONS:The PCI ECU (D420) detects a lower current than expected on the control circuit of the lambda sensor heater. DIAGNOSTIC CONDITION:The diagnostic runs continuously when the ignition is keyed on. RESET CONDITION:The DTC changes to inactive after the diagnostic runs and passes. POSSIBLE CAUSES:1. Open circuit in the lambda sensor wiring2. Lambda sensor failure