Paccar

PACCAR MX (2004 Emissions) Fault Code: P1678 PCI ECU – Software Error SET CONDITIONS:Programmed data in the ECU not correct. DIAGNOSTIC CONDITION:This diagnostic runs during start-up of the PCI ECU. RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. POSSIBLE CAUSES:Software fault ADDITIONAL INFORMATION:1. The PCI ECU does not start up.2. Engine cannot be started.

PACCAR MX (2004 Emissions) Fault Code: P1679 PCI ECU – Internal Error SET CONDITIONS:Programmed data in the ECU not correct. DIAGNOSTIC CONDITION:This diagnostic runs during start-up of the PCI ECU. RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. POSSIBLE CAUSES:Software fault ADDITIONAL INFORMATION:1. The PCI ECU does not start up.2. Engine cannot be started.

PACCAR MX (2004 Emissions) Fault Code: P1681 PCI ECU – Software Error SET CONDITIONS:Programmed data in the ECU not correct. DIAGNOSTIC CONDITION:This diagnostic runs during start-up of the PCI ECU. RESET CONDITION:This DTC changes to inactive when the fault is no longer detected. POSSIBLE CAUSES:Software fault ADDITIONAL INFORMATION:1. The PCI ECU does not start up.2. Engine cannot be started.

PACCAR MX (2004 Emissions) Fault Code: P1682 Engine Oil Level – Current Too Low or Open Circuit on ECU (D420) Pin (B35) 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

PACCAR MX (2004 Emissions) Fault Code: P1687 Starter Motor – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (B16) 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–...