Paccar

PACCAR MX (2004 Emissions) Fault Code: P2600 Coolant Pump – Open Circuit on ECU (D420) Pin (C1) DIAGNOSTIC CONDITION:This diagnostic runs continuously when the ignition is on. ADDITIONAL INFORMATION:1. The two-stage clutch coolant pump can run at two different speeds. At high speed, the pump is driven directly by the crankshaft with the poly-V-belt ratio. Low speed is approximately 50% of high speed. 2. When this DTC is active the coolant pump only runs at low speed. 3. P00B7 may also become active when the coolant pump is controlled to run at high speed.

PACCAR MX (2004 Emissions) Fault Code: P2603 Coolant Pump Speed – Data Valid but Too High SET CONDITIONS:The PCI ECU (D420) detects that the coolant pump speed is above 5800 rpm. 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:Malfunctioning coolant pump speed sensor or wiring ADDITIONAL INFORMATION:The coolant pump...

PACCAR MX (2004 Emissions) Fault Code: P2604 Coolant Pump – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (C1) 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: P2605 Coolant Pump – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (C1) 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 sensor...

PACCAR MX (2004 Emissions) Fault Code: P2609 Grid Heater Relay – Current Too Low or Open Circuit on ECU (D420) Pin (C55) SET CONDITIONS:The PCI ECU (D420) detects an open circuit on pin C55. DIAGNOSTIC CONDITION:The diagnostic runs continuously when the ignition is keyed on. 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 POSSIBLE CAUSES:1. The sensor or actuator signal wiring has an open circuit.2. A malfunction of the sensor or actuator ADDITIONAL INFORMATION:Through...