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PACCAR PX-8 CM2150 (2007-09) Fault Code: 2635 PID: SID 027 SPN: 641 FMI: 11 VGT Actuator Driver Circuit – Condition Exists. A calibration mismatch between the VGT actuator and the ECM has been detected.
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary, calibrate the ECM again.
This fault code is logged when the primary engine ECM does not receive valid J1939 information from the VGT actuator.
Troubleshoot high inactive counts of Fault Code 2636 as an active fault code.
Possible causes:
1)The VGT actuator is not receiving power from the ECM. This could be caused by an open circuit in the power supply wire or low voltage supplied by the primary engine ECM
2)An open return circuit on the VGT actuator circuit
3)An open or short circuit on the J1939 data link circuit between the ECM and VGT actuator
4)Intermittent communications between the VGT actuator and the primary engine ECM on the J1939 data link
5)Rapid cycling of the keyswitch
6)Connector pins are not installed in the appropriate locations specified by the wiring diagram.
7)A damaged termination resistor in the engine data link harness
8)A damaged engine ECM.
The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Use the following procedures to perform the aftertreatment initial check procedure to test for a damaged diesel particulate filter.
Possible repairs:
1)Replace the VGT actuator.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2634 PID: SID 027 SPN: 641 FMI: 12 VGT Actuator Controller – Bad Intelligent Device or Component. An internal error has been detected by the smart VGT controller.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2558 PID: SID 057 SPN: 697 FMI: 4 Auxiliary PWM Driver 1 – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the analog torque circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2557 PID: SID 057 SPN: 697 FMI: 3 Auxiliary PWM Driver 1 – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the analog torque circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2556 PID: SID 070 SPN: 729 FMI: 4 Intake Air Heater 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the intake air heater signal circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2555 PID: SID 070 SPN: 729 FMI: 3 Intake Air Heater 1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the intake air heater signal circuit.
PACCAR PX-8 CM2150 (2007-09) Fault Code: 2554 PID: 131 SPN: 1209 FMI: 2 Exhaust Gas Pressure – Data Erratic, Intermittent, or Incorrect. The exhaust gas pressure sensor is reading an erratic value at initial Key On.