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)
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)
SET CONDITIONS:
The PCI ECU (D420) detects a too low voltage or a short circuit to ground on the ECU pin A3 or A7 or A11 circuit.
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. To enable the injector output, the DTC must be cleared.
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:
Short circuit to ground in the circuit of ECU pin:
A3 or; A7 or; A11
ADDITIONAL INFORMATION:
The injector output is disabled by the PCI ECU when this DTC is detected. The output stays disabled until the DTC is cleared.
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