TROUBLESHOOTING FOR DTC
DTC | P1119 | Inlet Metering Valve (IMV) Control Malfunction |
CC-CODE | 96 | Fuel leakage |
97 | Fuel leakage |
98 | Fuel leakage) |
99 | Fuel leakage |
DTC | P1120 | Inlet Metering Valve (IMV) Circuit Malfunction |
CC-CODE | 0a | Open circuit or short circuit to ground |
03 | Short circuit to battery line |
05 | Fuel leakage |
04 | Fuel leakage |
08 | Fuel leakage |
The Inlet Metering Valve (IMV) is used to control the rail pressure by regulating the amount of fuel which is sent to the pumping element of the HP pump. This IMV has two purposes:
Firstly, it allows the efficiency of the injection system to be improved, since the HP pump only compresses the amount of fuel necessary to maintain in the rail the level of pressure required by the system as a function of the engine operating conditions.
Secondly, it allows the temperature to be reduced in the fuel tank. When the excess fuel is discharged into the back leak circuit, the pressure reduction in the fluid (fromrail pressure down to atmospheric pressure) gives off a large amount of heat. This leads to a temperature rise in the fuel entering the tank. In order to prevent too high a temperature being reached, it is necessary to limit the amount of heat generated by the fuel pressure reduction, by reducing the back leak flow. To reduce the back leak flow, it is sufficient to adapt the flow of the HP pump to the engine requirements throughout its operating range.
(P1119)CC-CODE | Detecting Condition | Suspect Area |
96 | The rail pressure is slightly lower than the demand.
| Open or short in IMV cirucit IMV High pressure fuel circuit Low pressure fuel circuit Injector High pressure pump ECM
|
97 |
98 | The rail pressure is slightly higher than the demand.
|
99 |
(P1120)CC-CODE | Detecting Condition | Suspect Area |
0a | Open or short to ground in IMV circuit
| Open or short in IMV cirucit IMV High pressure fuel circuit Low pressure fuel circuit Injector High pressure pump ECM
|
03 | Short to battery line in IMV circuit
|
05 | The rail pressure remains 101.9 kgf/cm² above the demand for a variable time depending on the difference.
|
04 | The rail pressure remains 101.9 kgf/cm² below the demand for a variable time depending on the difference.
|
08 | The pressure rise on starting is too slow.
|
SPECIFICATIONInlet Metering Valve Resistance (O) | 5.5O at 20°C (68°F) |
[SCHEMATIC DIAGRAM]
INSPECTION PROCEDURE