DESCRIPTION
The high-pressure direct injection fuel system consists of a spill control valve, check valve, fuel relief valve, fuel pressure sensor (for high pressure side), fuel pump assembly (for high pressure side) and direct fuel injector assemblies. The spill control valve adjusts the return volume of the high-pressure fuel. The check valve mechanically opens and closes the paths to the fuel delivery pipes. The relief valve releases the fuel back to the fuel tank if the high-pressure fuel system malfunctions. The fuel pump assembly (for high pressure side) is installed to the cylinder head cover and operated by a cam installed to the end of the exhaust camshaft. Rotation of the camshaft moves the pump plunger inside the fuel pump assembly (for high pressure side) up and down, pressurizing the fuel. The pressurized fuel opens the check valve and is pumped into the fuel delivery pipe.
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Note |
---|---|---|---|---|---|
P123513 | High Pressure Fuel Pump Circuit Open |
Open or short in fuel pump assembly (for high pressure side) circuit detected 60 times or more (1 trip detection logic). |
| Comes on |
|
MONITOR DESCRIPTION
If an open or short in the fuel pump assembly (for high pressure side) circuit is detected after the engine is started, the ECM will illuminate the MIL and store this DTC.
MONITOR STRATEGY
Related DTCs | P1235: Fuel pump (for high pressure side) circuit/open |
Required Sensors/Components (Main) | Fuel pump assembly (for high pressure side) |
Required Sensors/Components (Related) |
Injector driver (ECM) |
Frequency of Operation |
Continuous |
Duration |
- |
MIL Operation |
Immediate |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored |
None |
All of the following conditions are met |
- |
Time after engine start |
5 seconds or more |
Command to injector driver relay |
On |
Output duty cycle |
5 to 95% |
Auxiliary battery voltage |
10.5 V or higher |
Ignition switch |
ON |
Engine | Running |
TYPICAL MALFUNCTION THRESHOLDS
One of the following conditions is met | 1, 2, 3, 4 or 5 |
1. Both of the following conditions are met |
- |
Following condition is met |
60 time or more |
High pressure fuel pump voltage detected by injector driver IC |
4.8 V or higher |
2. Both of the following conditions are met |
- |
Following condition is met |
60 time or more |
High pressure fuel pump voltage detected by injector driver IC |
1.2 V or less |
3. Both of the following conditions are met |
- |
Following condition is met |
60 time or more |
High pressure fuel pump current detected by injector driver IC |
140 A or higher |
4. Both of the following conditions are met |
- |
Following condition is met |
60 time or more |
High pressure fuel pump drive MOSFET current detected by injector driver IC |
12 A or higher |
5. Both of the following conditions are met |
- |
Following condition is met |
60 time or more |
High pressure fuel pump drive MOSFET voltage detected by injector driver IC |
0.02 V or less |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
Click here
HINT:
GTS Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
HINT:
PROCEDURE
1. | INSPECT FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) |
Click here
HINT:
Perform "Inspection After Repair" after replacing the fuel pump assembly (for high pressure side).
Click here
NG | REPLACE FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) |
|
2. |
CHECK HARNESS AND CONNECTOR (FUEL PUMP ASSEMBLY (FOR HIGH PRESSURE SIDE) - ECM) |
(a) Disconnect the fuel pump assembly (for high pressure side) connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition |
Specified Condition |
---|---|---|
C27-2 (FP+) - C139-19 (FP1+) |
Always | Below 1 Ω |
C27-1 (FP-) - C139-18 (FP1-) |
Always | Below 1 Ω |
C27-2 (FP+) or C139-19 (FP1+) - Body ground and other terminals |
Always | 10 kΩ or higher |
C27-1 (FP-) or C139-18 (FP1-) - Body ground and other terminals |
Always | 10 kΩ or higher |
OK | REPLACE ECM |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |