PACCAR MX (2004 Emissions) Fault Code: P1195 Common Rail Fuel Pressure – Data Erratic, Intermittent or Incorrect, at Ignition On

PACCAR MX (2004 Emissions) Fault Code: P1195 Common Rail Fuel Pressure – Data Erratic, Intermittent or Incorrect, at Ignition On

SET CONDITIONS:
The PCI ECU (D420) detects that the actual rail pressure is more than 245 bar [3553 psi].

DIAGNOSTIC CONDITION:
This diagnostic runs when:
1. The engine is not running and
2. The ignition is keyed on after it has been off for more than 200 seconds and
3. Fuel temperature is lower than the fuel temperature at the previous ignition switch off event.

CORRESPONDING OBD READINESS MONITOR:
Comprehensive components monitor

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 following conditions:
– Corresponding readiness monitor displays ‘Ready’
– Diagnostic conditions are met
– Set conditions are met
3. Did the DTC come back? (Can be pending, inactive or active)
– No, repair successful
– Yes, repair unsuccessful

POSSIBLE CAUSES:
Common rail pressure sensor deviation

ADDITIONAL INFORMATION:
1. For this diagnostic, the actual rail pressure is monitored when the engine is not running.

2. The rail pressure is measured in the common rail by the common rail pressure sensor (F854).

3. When this DTC is active:
– The engine torque is reduced.
– The engine runs in protection mode.
– The engine runs in rail pressure control state: Release valve only.
– The maximum rail pressure is limited to 1300 bar.