Paccar

PACCAR MX (2004 Emissions) Fault Code: P009F Common Rail Pressure Release Valve – Malfunction Detected During Check

SET CONDITIONS:
The PCI ECU (D420) detects that the common rail pressure release valve is stuck for more than 3 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. Engine load is steady and;
2. Engine speed is between 1000 and 1700 rpm and;
3. When the rail pressure operating state is: Pump unit only
4. Requested rail pressure is more than 700 bar [10,153 PSI] and;
5. Difference between the actual and requested rail pressure is less than 20 bar [290 PSI] and
6. Engine running time since the last completed test is more than 4 hours

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Common rail pressure release valve failure

ADDITIONAL INFORMATION:
1. One of the functions of the common rail pressure release valve (L094) is to rapidly decrease the rail pressure (dumping) in certain engine operations. During normal operation the valve is electronically controlled (duty cycle) to keep it closed.

2. For this diagnostic, the common rail pressure release valve is checked via an autonomous test to see whether it’s stuck. During steady state engine operating conditions, the PCI ECU momentarily decreases the common rail pressure release valve current. This should result in fuel being dumped from the rail causing a pressure drop. Since the rail pressure is close-loop controlled, the PCI ECU activates the pump units for longer to maintain the requested rail pressure. If the common rail pressure release valve is stuck, the rail pressure remains the same when the control current of the valve is decreased.

3. When this DTC is active:
– The engine torque is reduced.
– The engine runs in protection mode.
– The maximum rail pressure is limited to 1300 bar.

PACCAR MX (2004 Emissions) Fault Code: P00B7 Coolant Pump Speed – Data Valid but Too Low When High Speed is Requested

SET CONDITIONS:
The PCI ECU (D420) detects that the average coolant pump speed is 400 rpm lower than expected.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is running and the coolant pump is activated to run at high speed.

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. Prolonged engine starting (>12 seconds)
2. Malfunctioning coolant pump speed sensor or wiring
3. Malfunctioning two-stage coolant pump or wiring

ADDITIONAL INFORMATION:
1. The coolant pump speed is measured by the coolant pump speed sensor (F805).

IMPORTANT: The PCI ECU is not able to detect a short circuit or an open circuit of the coolant pump speed sensor or its wiring. It can only detect if the expected coolant pump speed is reached.

If no signal is received from the coolant pump speed sensor, the coolant pump speed (actual) in the diagnostic service tool displays 333 rpm when the engine is running.

2. When the engine is running, the minimum coolant pump speed (actual) which can be displayed in the diagnostic service tool is 333 rpm.

3. The two-stage coolant pump (L142) is controlled by the PCI ECU (D420).

IMPORTANT: The PCI ECU is not able to detect a short circuit or an open circuit of the coolant pump solenoid or its wiring. It can only detect if the expected coolant pump speed is reached.

4. Depending on the cooling request by the engine or vehicle (for example cabin heater), the PCI ECU activates the solenoid of the coolant pump to drive the impeller at low or high speed:
– Solenoid activated, the pump runs at high speed
– Solenoid not activated, the pump runs at low speed

5. If the signal of the coolant pump speed cannot be read by the PCI ECU, the signal coolant pump speed (actual) in the diagnostic service tool is 333 rpm (default value).

PACCAR MX (2004 Emissions) Fault Code: P00BA Common Rail Fuel Pressure – Data Valid but Too Low, Moderately Severe

SET CONDITIONS:
The PCI ECU (D420) detects that the actual rail pressure is less than 100 bar.

DIAGNOSTIC CONDITION:
This diagnostic runs 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:
1. A common rail pump unit failure if DTCs P0094 and/or P228D are also present.
2. An external or internal leakage on the high-pressure fuel system components.

ADDITIONAL INFORMATION:
1. The rail pressure is closed-loop controlled. A comparison is made between the requested and actual rail pressure measured by the common rail pressure sensor.

2. The rail pressure is measured in the common rail by the common rail pressure sensor (F854).

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)

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
– Yes, repair unsuccessful

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 or actuator
4. A malfunction of the sensor or actuator

ADDITIONAL INFORMATION:
Multiple sensor related voltage-too-low DTCs can indicate a malfunction within a 5-V sensor power supply circuit of the PCI ECU.

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)

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:
This diagnosis runs continuously when the ignition is keyed ON.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
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 following conditions:
– Diagnostic conditions are met
– Set conditions are met
4. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Boost pressure sensor wiring has a short circuit to supply.
2. Malfunction of the boost pressure sensor (F802)

PACCAR MX (2004 Emissions) Fault Code: P0110 Inlet Air Temperature in Inlet Manifold – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that measured boost temperature differs more than 3°C [37°F] from the average of other temperature sensors on the engine for more than 5 seconds (after the ignition has been switched off for at least 8 hours).

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the ignition has been keyed off continuously for at least 8 hours
2. Difference between the coolant temperature and ambient temperature is less than 15°C [59°F]
3. Ambient temperature is more than -20°C [-4°F]

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Boost temperature sensor deviation

ADDITIONAL INFORMATION:
For this diagnostic the boost temperature sensor (F804) reading is compared with an average of other temperature sensors on the engine after the ignition has been switched off for at least 8 hours.

PACCAR MX (2004 Emissions) Fault Code: P0112 Inlet Air Temperature in Inlet Manifold – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A43)

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
– Yes, repair unsuccessful

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 or actuator
4. A malfunction of the sensor or actuator

ADDITIONAL INFORMATION:
Multiple sensor related voltage-too-low DTCs can indicate a malfunction within a 5-V sensor power supply circuit of the PCI ECU.

PACCAR MX (2004 Emissions) Fault Code: P0113 Inlet Air Temperature in Inlet Manifold – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A43)

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
– Yes, repair unsuccessful

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: P0115 Engine Coolant Temperature – Data Erratic, Intermittent or Incorrect During Overrun, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the measured coolant temperature differs more than 3°C [5.4°F] from the average of other temperature sensors on the engine for more than 5 seconds (after the ignition has been keyed off for at least 8 hours).

DIAGNOSTIC CONDITION:
This diagnostic runs:
1. When the ignition has been keyed off continuously for at least 8 hours
2. Difference between the coolant and ambient temperature is less than 15°C [59°F]
3. Ambient temperature is more than -20°C [-4°F]

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? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
1. Engine (block) heater used
2. Coolant temperature sensor deviation

ADDITIONAL INFORMATION:
For this diagnostic, the engine coolant temperature sensor (F566) reading is compared with average readings of other temperature sensors on/off the engine after the ignition has been keyed off for at least 8 hours.