SSANGYONG 2004 Rexton 2.7XDi Workshop Manual page 410

DI10-50
DTC Trouble
P1256 Too Small Transfer Pres-
sure Fuel in Rail Pressure
System
P1257 Too Large Transfer Pres-
sure Fuel in Rail Pressure
System
CHANGED BY
EFFECTIVE DATE
AFFECTED VIN
Help
- Rail pressure fault: IMV current trim too
high, drift.
- Check the IMV wiring harness.
- Check the ECU wiring harness.
• Check the ECU pin #87 for open and
short.
- Check the rail pressure sensor.
• Supply voltage: 5 ± 0.1 V
• Output voltage at 1600 bar: 4.055 ±
0.125 V
• Output voltage at atmospheric
pressure: 0.5 ± 0.04 V
- Check the transfer pressure fuel pres-
sure lines.
• Check the fuel level in fuel tank.
Check the fuel system for air influx.
• Check the fuel filter specification.
- Check the high pressure fuel system.
• Check the fuel rails and high pres-
sure pipes for leaks.
- Check the IMV resistance: 5.44 Ω
• When out of specified value: replace
high pressure pump and IMV
- Replace the ECU if required.
- Rail pressure fault: IMV current trim too
high, drift.
- Check the IMV wiring harness.
- Check the ECU wiring harness.
• Check the ECU pin #87 for open and
short.
- Check the rail pressure sensor.
• Supply voltage: 5 ± 0.1 V
• Output voltage at 1600 bar: 4.055 ±
0.125 V
• Output voltage at atmospheric
pressure: 0.5 ± 0.04 V
- Check the transfer pressure fuel pres-
sure lines.
• Check the fuel level in fuel tank.
Check the fuel system for air influx.
• Check the fuel filter specification.
- Check the high pressure fuel system.
• Check the fuel rails and high pres-
sure pipes for leaks.
- Check the IMV resistance: 5.44 Ω
• When out of specified value: replace
high pressure pump and IMV
- Replace the ECU if required.
Torque Torque Delayed
Reduction Reduction Engine
(max.50%) (max.20%) Stop
Immediately Limp
Engine Home
Stop Mode
DIAGNOSIS
DI ENG SM - 2004.4