P127D

1UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1276-P1279,P127A-P127D: Port Injector Circuit No. 1
P127D - Port Injector Circuit #8

DESCRIPTION

The D-4S system has two injection systems. One is the in-cylinder direct injection system that directly injects pressurized fuel into the combustion chamber. The other is the intake port injection system. The ECM determines the percentage of in-cylinder direct injection to the intake port injection systems in accordance with the engine speed and load.





MONITOR DESCRIPTION

The ECM monitors the injection control of the port injector. If a malfunction is detected in the port injector circuit, the ECM cancels the injection control for the corresponding cylinder and turns on the MIL.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





CONFIRMATION DRIVING PATTERN





- Connect the Techstream to the DLC3.

- Turn the engine switch on (IG) and turn the Techstream on.

- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) DTC Check / Clear.

- Turn the engine switch off and wait for 30 seconds.

- Turn the engine switch on (IG) and turn the Techstream on [A].

- Start the engine.

- Idle the engine for 10 seconds [B].

- Enter the following menus: Powertrain / Engine / Trouble Codes.

- Read the DTC [C].

HINT
- If a DTC is output, the system is malfunctioning.
- If a DTC is not output, perform the following procedure.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Input the DTC: P1276, P1277, P1278, P1279, P127A, P127B, P127C or P127D.

- Check the DTC judgment result.





HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform step [B] again.
- Enter the following menus: Powertrain / Engine / Utility / All Readiness.

- Check the DTC judgment result.

HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows NORMAL, the system is normal.
- If the test result is INCOMPLETE or UNKNOWN and no DTC is output, perform a universal trip and check for permanent DTCs DTC Check / Clear.

HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
WIRING DIAGRAM









INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. 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 running or stopped, 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.

PROCEDURE

1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P1276, P1277, P1278, P1279, P127A, P127B, P127C OR P127D)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Start the engine.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / Engine / Trouble Codes.

(f) Read the DTCs.

Result:





HINT
If any DTCs other than P1276, P1277, P1278, P1279, P127A, P127B, P127C or P127D are output, troubleshoot those DTCs first.

B -- GO TO DTC CHART SFI System
A -- Continue to next step.

2. CHECK FUEL INJECTOR FOR PORT INJECTION (POWER SOURCE VOLTAGE)

(a) Disconnect the fuel injector connector for port injection.





(b) Turn the engine switch on (IG).

(c) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





(d) Reconnect the injector connector.

NG -- CHECK AND REPAIR HARNESS OR CONNECTOR (INJ FUSE - INJECTOR FOR PORT INJECTION)
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (ECM - FUEL INJECTOR FOR PORT INJECTION)

(a) Disconnect the fuel injector connector for port injection.

(b) Disconnect the ECM connectors.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance (Check for Open):





Standard Resistance (Check for Short):





(d) Reconnect the injector connector and ECM connectors.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. CHECK FUEL INJECTOR FOR PORT INJECTION (RESISTANCE)

(a) Check the fuel injector for port injection resistance Fuel Injector (for Port Injection).

NG -- REPLACE FUEL INJECTOR FOR PORT INJECTION

OK -- REPLACE ECM Components