PACCAR MX (2004 Emissions) Fault Code: P109D Common Rail Pressure Release Valve - Current Too High on ECU (D420) Pin (C4)

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is 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

ADDITIONAL INFORMATION:
When this DTC is active:
1. The engine torque is reduced.
2. The engine runs in protection mode.
3. The rail pressure control is in the limp-home function.
4. The rail pressure is limited to approximately 800 bar.

PACCAR MX (2004 Emissions) Fault Code: P109C Common Rail Pressure Release Valve - Current Too Low or Open Circuit on ECU (D420) Pin (C4)

PACCAR MX (2004 Emissions) Fault Code: P0108 Inlet Air Pressure in Inlet Manifold - Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A51)

PACCAR MX (2004 Emissions) Fault Code: P0107 Inlet Air Pressure in Inlet Manifold - Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A51)

PACCAR MX (2004 Emissions) Fault Code: P104E Exhaust Gas Pressure Before Turbine - Data Valid but Too Low, During Engine Braking

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