PACCAR MX (2004 Emissions) Fault Code: P1235 Turbo Speed - Data Erratic, Intermittent, or Incorrect

SET CONDITIONS:
The PCI ECU (D420) detects that the measured turbo speed differs too much from the expected turbo speed for more than 120 seconds.

DIAGNOSTIC CONDITION:
This diagnostic runs when the engine is running at a steady load and the coolant temperature is above 50?C [122?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. Fault on turbo speed sensor
2. Fault on boost pressure sensor

ADDITIONAL INFORMATION:
1. The turbo speed is measured by the turbo speed sensor (F683).
2. The boost pressure sensor signal is used to calculate the expected turbo speed.

PACCAR MX (2004 Emissions) Fault Code: P1234 Common Rail Pump Unit 2 - Short Circuit Between ECU (D420) Pin (A27) and Pin (A28)

PACCAR MX (2004 Emissions) Fault Code: P1230 Common Rail Pump Unit 1 - Short Circuit Between ECU (D420) Pin (A25) and Pin (A26)

PACCAR MX (2004 Emissions) Fault Code: P1228 Injector Solenoid Valve Cylinder 4, 5, or 6 - Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A11) or Pin (A3) or Pin (A7)

PACCAR MX (2004 Emissions) Fault Code: P1227 Injector Solenoid Valve Cylinder 4, 5, or 6 - Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A11) or Pin (A3) or Pin (A7)

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