Paccar

PACCAR MX (2004 Emissions) Fault Code: P1205 Injector Solenoid Valve Cylinder 5 – Current Too Low or Open Circuit on ECU (D420) Pin (A3) and or Pin (A4)

SET CONDITIONS:
The PCI ECU (D420) detects no or a too low current in the electrical circuit of the injector.

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

CORRESPONDING OBD READINESS MONITOR:
None

RESET CONDITION:
1. This DTC changes to inactive when the fault is no longer detected.
2. To enable the injector output, the ignition must be shut off for more the 15 seconds and turned on again.

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. Open circuit in the wiring of the wiring loom frame (valve cover)
2. Faulty injector
3. Engine wiring harness

ADDITIONAL INFORMATION:
The injector output is disabled by the PCI ECU when this DTC is detected.

PACCAR MX (2004 Emissions) Fault Code: P1206 Injector Solenoid Valve Cylinder 5 – Short Circuit Between ECU (D420) Pin (A3) and Pin (A4)

SET CONDITIONS:
The PCI ECU (D420) detects a short circuit between the ECU pin A3 and A4 circuits.

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 DTCs 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:
1. Faulty injector
2. Engine wiring harness

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.

PACCAR MX (2004 Emissions) Fault Code: P1207 Injector Solenoid Valve Cylinder 5 – Voltage Too Low or Short Circuit to Ground on ECU (D420) Pin (A4)

SET CONDITIONS:
The PCI ECU (D420) detects a too low voltage or a short circuit to ground on the ECU pin A4 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:
1. Short circuit to ground in the circuit of ECU pin:
– A4 or
– A8 or
– A12
2.Faulty injector 4 or 5 or 6

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.

PACCAR MX (2004 Emissions) Fault Code: P1208 Injector Solenoid Valve Cylinder 5 – Voltage Too High or Short Circuit to Supply on ECU (D420) Pin (A4)

SET CONDITIONS:
The PCI ECU (D420) detects a too high voltage or a short circuit to supply on the ECU pin A4 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 supply in the circuit of ECU pin A4

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.

PACCAR MX (2004 Emissions) Fault Code: P1209 Injector Solenoid Valve Cylinder 3 – Current Too Low or Open Circuit on ECU (D420) Pin (A5) and or Pin (A6)

SET CONDITIONS:
The PCI ECU (D420) detects no or a too low current in the electrical circuit of the injector.

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

CORRESPONDING OBD READINESS MONITOR:
None

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

2. To enable the injector output, the ignition must be shut off for more the 15 seconds and turned on again.

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. Open circuit in the wiring of the wiring loom frame (valve cover)
2. Faulty injector
3. Engine wiring harness

ADDITIONAL INFORMATION:
The injector output is disabled by the PCI ECU when this DTC is detected.

PACCAR MX (2004 Emissions) Fault Code: P1210 Injector Solenoid Valve Cylinder 3 – Short Circuit Between ECU (D420) Pin (A5) and Pin (A6)

SET CONDITIONS:
The PCI ECU (D420) detects a short circuit between the ECU pin A5 and A6 circuits.

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 DTCs 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:
1. Faulty injector
2. Engine wiring harness

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.