Paccar

PACCAR MX (2004 Emissions) Fault Code: P0522 Engine Oil Pressure – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C84) 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. RESET CONDITION:The DTC changes to inactive after the diagnostic runs and passes. POSSIBLE CAUSES:1. The sensor or actuator signal wiring is interrupted.2. The sensor or actuator signal wiring has a short circuit to ground.3. A malfunction in the power supply of the...

PACCAR MX (2004 Emissions) Fault Code: P0523 Engine Oil Pressure – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C84) 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. RESET CONDITION:The DTC changes to inactive after the diagnostic runs and passes. POSSIBLE CAUSES:1. The sensor or actuator signal wiring has a short circuit to supply.2. A malfunction of the sensor or actuator

PACCAR MX (2004 Emissions) Fault Code: P0524 Engine Oil Pressure – Data Valid but Too Low, Most Severe SET CONDITIONS:The PCI ECU (D420) detects that the oil pressure is too low. DIAGNOSTIC CONDITION:This diagnostic runs when the engine is running for more than 8 s. CORRESPONDING OBD READINESS MONITOR:None RESET CONDITION:1. This DTC changes to INACTIVE after the diagnosis runs and passes.2. This DTC cannot be cleared from the ECU memory. REPAIR VERIFICATION:1. Contact your engine field service representative for authorization to clear the warranty DTC.2. Clear all DTCs.3. Test drive or operate the vehicle to meet the diagnostic conditions...

PACCAR MX (2004 Emissions) Fault Code: P0527 Fan Speed – Data Valid but Too High SET CONDITIONS:The PCI ECU (D420) detects that the fan speed is higher than the engine speed. DIAGNOSTIC CONDITION:The diagnostic runs when the engine speed is above 1200 rpm. 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– Yes, repair unsuccessful POSSIBLE CAUSES:1. The sensor or actuator signal wiring has a short...

PACCAR MX (2004 Emissions) Fault Code: P0528 Fan Speed – Data Valid but Too Low SET CONDITIONS:The PCI ECU (D420) detects that the fan speed is below 50 rpm. DIAGNOSTIC CONDITION:The diagnostic runs when the engine speed is above 1200 rpm. RESET CONDITION:This DTC changes to INACTIVE after the diagnosis runs and passes. POSSIBLE CAUSES:1. The fan does not rotate freely (for example, fan blade hits the wind tunnel).2. The sensor or actuator signal wiring is interrupted.3. The sensor or actuator signal wiring has a short circuit to ground.4. A malfunction in the power supply of the sensor5. A malfunction...