To improve emissions immediately after a cold start, cold start multi pulse fuel injection control is performed which divides a single pulse of the direct fuel injector into several smaller pulses.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P128300 | Cold Start Fuel Injection Control Performance #1 | Cold start multi pulse fuel injection control for the No. 1 cylinder is not performed (2 trip detection logic). | ·
Direct fuel injector assembly (No. 1 cylinder) ·
Open or short in direct fuel injector assembly circuit ·
ECM |
Comes on | DTC stored | SAE: P1283 |
| P128400 | Cold Start Fuel Injection Control Performance #2 | Cold start multi pulse fuel injection control for the No. 2 cylinder is not performed (2 trip detection logic). | ·
Direct fuel injector assembly (No. 2 cylinder) ·
Open or short in direct fuel injector assembly circuit ·
ECM |
Comes on | DTC stored | SAE: P1284 |
| P128500 | Cold Start Fuel Injection Control Performance #3 | Cold start multi pulse fuel injection control for the No. 3 cylinder is not performed (2 trip detection logic). | ·
Direct fuel injector assembly (No. 3 cylinder) ·
Open or short in direct fuel injector assembly circuit ·
ECM |
Comes on | DTC stored | SAE: P1285 |
| P128600 | Cold Start Fuel Injection Control Performance #4 | Cold start multi pulse fuel injection control for the No. 4 cylinder is not performed (2 trip detection logic). | ·
Direct fuel injector assembly (No. 4 cylinder) ·
Open or short in direct fuel injector assembly circuit ·
ECM |
Comes on | DTC stored | SAE: P1286 |
| DTC No. | Data List |
|---|---|
| P128300 | ·
Engine Speed ·
Mass Air Flow Sensor ·
Coolant Temperature ·
Target Fuel Pressure (High) ·
Fuel Pressure (High) ·
High Fuel Pressure Sensor ·
Injection Mode ·
Injection Timing Cylinder #1 (D4) ·
Injection Time Cylinder #1 (D4) ·
Ignition Timing Cylinder #1 |
| P128400 | |
| P128500 | |
| P128600 |
While performing cold start multi pulse fuel injection control, the ECM monitors the direct fuel injector assemblies. When cold start multi pulse fuel injection control is being performed, the ECM counts the number of times that an injector does not pulse per cycle, and if the total number exceeds the threshold, the ECM determines that cold start multi pulse fuel injection control is malfunctioning and illuminates the MIL and stores a DTC.
| Required Sensors/Components | Direct fuel injector assembly
ECM (injector driver) |
| Frequency of Operation | Once per driving cycle |
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.
Ensure that the engine coolant temperature is -10 to 50°C (-50 to 122°F) then start the engine [A].
Allow the engine to idle for 15 seconds or more [B].
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
Read the pending DTCs.
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P128300, P128400, P128500 or P128600.
Check the DTC judgment result.
| GTS Display | Description |
|---|---|
| NORMAL | ·
DTC judgment completed ·
System normal |
| ABNORMAL | ·
DTC judgment completed ·
System abnormal |
| INCOMPLETE | ·
DTC judgment not completed ·
Perform driving pattern after confirming DTC enabling conditions |
If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system is malfunctioning.
If the judgment result is INCOMPLETE, perform steps [A] through [C] again.
[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTC P128300, P128400, P128500 and/or P128600 is output | A |
| DTC P128300, P128400, P128500 and/or P128600 and other DTCs are output | B |
If any DTCs other than P128300, P128400, P128500 and/or P128600 are output, troubleshoot those DTCs first.
A
B
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
| Result | Proceed to |
|---|---|
| Only 1 DTC among DTC P128300, P128400, P128500 and P128600 is output | A |
| 2 or more DTCs among DTC P128300, P128400, P128500 and P128600 are output | B |
If the malfunction occurred for one cylinder or multiple cylinders can be determined based on the stored DTCs.
A
B
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| C71-23 (#1D+) - C71-24 (#1D-) | 20°C (68°F) | 1.34 to 1.64 Ω |
| C71-18 (#2D+) - C71-17 (#2D-) | 20°C (68°F) | 1.34 to 1.64 Ω |
| C71-19 (#3D+) - C71-20 (#3D-) | 20°C (68°F) | 1.34 to 1.64 Ω |
| C71-22 (#4D+) - C71-21 (#4D-) | 20°C (68°F) | 1.34 to 1.64 Ω |
| C71-23 (#1D+) or C71-24 (#1D-) - Body ground and other terminals | Always | 1 MΩ or higher |
| C71-18 (#2D+) or C71-17 (#2D-) - Body ground and other terminals | Always | 1 MΩ or higher |
| C71-19 (#3D+) or C71-20 (#3D-) - Body ground and other terminals | Always | 1 MΩ or higher |
| C71-22 (#4D+) or C71-21 (#4D-) - Body ground and other terminals | Always | 1 MΩ or higher |
The standard values shown are direct fuel injector assembly resistance values.
If the measured resistance value differs from the other cylinders and the injector resistance is normal, check the related cylinder as a poorly connected connector is suspected.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Check the resistance of the direct fuel injector assembly.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Replace the direct fuel injector assembly.
Perform "Inspection After Repair" after replacing the direct fuel injector assembly.
| Proceed to |
|---|
| NEXT |
NEXT
| Proceed to |
|---|
| NEXT |
NEXT
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
| Proceed to |
|---|
| NEXT |
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the DTCs.
DTCs are not output.
| Proceed to |
|---|
| NEXT |
NEXT