Paccar

PACCAR MX (2004 Emissions) Fault Code: P1137 Lambda Sensor Heater Power Supply – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the power supply to control the lambda sensor heater is less than 9 V for more than five seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is running.

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.

POSSIBLE CAUSES:
Power supply to the PCI ECU

ADDITIONAL INFORMATION:
The PCI ECU uses the oxygen concentration in the exhaust measured by the lambda sensor (F834) to determine the air/fuel ratio of the combustion process. The sensor has an integrated heater to maintain a sensor operating temperature of approximately 750?C [1382?F].

PACCAR MX (2004 Emissions) Fault Code: P1139 Lambda Sensor Calibration – Malfunction

SET CONDITIONS:
The PCI ECU (D420) detects that the calibration phase of the lambda sensor has been completed unsuccessfully after several attempts.

DIAGNOSTIC CONDITION:
This diagnostic runs when the lambda sensor operating status is calibration.

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.

POSSIBLE CAUSES:
Faulty lambda sensor

ADDITIONAL INFORMATION:
1. The PCI ECU uses the oxygen concentration in the exhaust measured by the lambda sensor (F834) to determine the air/fuel ratio of the combustion process. The sensor has an integrated heater to maintain a sensor operating temperature of approximately 750?C [1382?F].

2. One of the lambda sensor operating statuses is the calibration mode. In calibration mode, an internal comparison is made between the actual and ideal lambda references so necessary signal corrections can be made accordingly.

PACCAR MX (2004 Emissions) Fault Code: P113B Lambda Sensor Controller – Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the lambda sensor heater controller inside the PCI ECU is malfunctioning.

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the engine is running.

RESET CONDITION:
This DTC changes to inactive when the fault is no longer detected.

ADDITIONAL INFORMATION:
The PCI ECU uses the oxygen concentration in the exhaust measured by the lambda sensor (F834) to determine the air/fuel ratio of the combustion process. The sensor has an integrated heater to maintain a sensor operating temperature of approximately 750°C [1382°F].

PACCAR MX (2004 Emissions) Fault Code: P1158 Wheel Speed, Front Axle, Left – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The ECU detects that the speed of the left-front axle wheel speed sensor is > 160 km/h [99 mph].

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when a normal wheel speed is 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:
Wheel speed sensor defect

ADDITIONAL INFORMATION:
The vehicle was driven excessively fast or the wheel speed sensor is malfunctioning.

PACCAR MX (2004 Emissions) Fault Code: P1159 Wheel Speed, Front Axle, Right – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The ECU detects that the speed of the right-front axle wheel speed sensor is > 160 km/h [99 mph].

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when a normal wheel speed is 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:
Wheel speed sensor defect

ADDITIONAL INFORMATION:
The vehicle was driven unrealistically fast or the wheel speed sensor is malfunctioning.

PACCAR MX (2004 Emissions) Fault Code: P1160 Wheel Speed, Rear Axle, Left – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The ECU detects that the speed of the left-rear axle wheel speed sensor is > 160 km/h [99 mph].

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when a normal wheel speed is 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:
Wheel speed sensor defect

ADDITIONAL INFORMATION:
The vehicle was driven unrealistically fast or the wheel speed sensor is malfunctioning.

PACCAR MX (2004 Emissions) Fault Code: P1161 Wheel Speed, Rear Axle, Right – Data Erratic, Intermittent or Incorrect

SET CONDITIONS:
The ECU detects that the speed of the right-rear axle wheel speed sensor is > 160 km/h [99 mph].

DIAGNOSTIC CONDITION:
This diagnostic runs continuously when the ignition is on.

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
This DTC changes to inactive when a normal wheel speed is 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:
Wheel speed sensor defect

ADDITIONAL INFORMATION:
The vehicle was driven unrealistically fast or the wheel speed sensor is malfunctioning.