Paccar

PACCAR MX (2004 Emissions) Fault Code: P0072 Ambient Temperature – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C78) 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 successful–...

PACCAR MX (2004 Emissions) Fault Code: P0073 Ambient Temperature – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C78) 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 successful–...

PACCAR MX (2004 Emissions) Fault Code: P0087 Fuel Pressure – Data Valid but Too Low, Most Severe SET CONDITIONS:The PCI ECU (D420) detects that the fuel pressure is too low for more than 5 seconds. DIAGNOSTIC CONDITION:This diagnostic runs when the engine has been running for more than 200 seconds. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:1. This DTC changes to inactive when the fault is no longer detected.2. This fault cannot be cleared from the ECU memory. 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...

PACCAR MX (2004 Emissions) Fault Code: P0088 Fuel Pressure – Data Valid but Too High SET CONDITIONS:The PCI ECU (D420) detects that the fuel pressure is 14 bar [203 psi] or more for more than 10 seconds. DIAGNOSTIC CONDITION:This diagnostic runs when the engine has been running for more than 200 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 diagnostic conditions and set conditions.3. Did the DTC come back?– No, repair successful– Yes, repair unsuccessful POSSIBLE...

PACCAR MX (2004 Emissions) Fault Code: P0093 Common Rail Fuel Pressure – Sudden Pressure Drop SET CONDITIONS:The PCI ECU (D420) detects that the actual rail pressure drops suddenly. DIAGNOSTIC CONDITION:This diagnostic runs when the rail pressure operating state is: Pump unit only. 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. An external or internal fuel leakage on the high...