P1278

2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: P1276-P1279,P127A-P127D: Port Injector Circuit No. 1
P127D - Port Injector Circuit #8

DESCRIPTION

The D-4S (Direct injection 4-stroke gasoline engine Superior) has two fuel injection systems. One is the port fuel injection system. The other is the direct fuel injection system.

The port fuel injector is supplied with battery voltage (12 V). When the internal transistor of the engine control module (ECM) turns on, the port fuel injector sprays fuel.





MONITOR DESCRIPTION

To monitor the port injector circuit, the ECM counts the number of times the injection fails. If the count reaches 10 times, the ECM interprets this as a malfunction. The ECM illuminates the malfunction indicator lamp (MIL) and sets the diagnosis trouble code (DTC) immediately.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





WIRING DIAGRAM









INSPECTION PROCEDURE

HINT
Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

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 power switch on (IG).

(c) Turn the Techstream ON.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read DTCs.

Result





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 for port injection connector.





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

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

Standard voltage:





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 for port injection connector.





(b) Disconnect the E2 and E4 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):





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 Removal

OK -- REPLACE ECM Removal