P1276
2GR-FSE ENGINE CONTROL: SFI SYSTEM: P1276-P1279,P127A,P127B: Port Injector Circuit No. 1
P127B - Port Injector Circuit No. 6
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
WIRING DIAGRAM
CONFIRMATION DRIVING PATTERN
1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure) Reading and Clearing Diagnostic Trouble Codes.
4. Turn the engine switch off and wait for 30 seconds.
5. Turn the engine switch on (IG) and turn the Techstream on [A].
6. Start the engine.
7. Idle the engine for 10 seconds [B].
8. Enter the following menus: Powertrain / Engine / Utility / All Readiness.
9. Input the DTC: P1276, P1277, P1278, P1279, P127A or P127B.
10. Check the DTC judgment result [C].
HINT
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [B] and [C] again.
11. If the test result is UNKNOWN, enter the following menus: Powertrain / Engine / Trouble Codes / Pending.
12. Read Pending DTCs.
HINT
If a pending DTC is output, the system is malfunctioning.
13. If the test result is INCOMPLETE or UNKNOWN and no pending DTC is output, perform a universal trip and check for permanent DTCs Reading and Clearing Diagnostic Trouble Codes.
HINT
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
INSPECTION PROCEDURE
PROCEDURE
1. CHECK ANY OTHER DTCs OUTPUT (IN ADDITION TO DTC P1276, P1277,P1278,P1279, P127A,OR P127B)
(a) Connect Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result:
C -- GO TO DTC CHART SFI System
B -- CHECK AND REPLACE IG2 FUSE
A -- Continue to next step.
2. CHECK ECM TERMINAL VOLTAGE (#1P, #2P, #3P, #4P, #5P OR #6P TERMINAL)
(a) Inspect using an oscilloscope.
(b) While idling, check the waveform of the ECM connectors.
Standard:
NG -- CHECK INJECTOR FOR PORT INJECTION (POWER SOURCE VOLTAGE)
OK -- CHECK FOR INTERMITTENT PROBLEMS Check For Intermittent Problems
3. CHECK INJECTOR FOR PORT INJECTION (POWER SOURCE VOLTAGE)
(a) Disconnect the fuel injector for port injection connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
(d) Reconnect the fuel injector for port injection connector.
NG -- CHECK AND REPAIR HARNESS OR CONNECTOR (IG2 RELAY - INJECTOR FOR PORT INJECTION)
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (ECM - FUEL INJECTOR FOR PORT INJECTION)
(a) Disconnect the ECM connector.
(b) Disconnect the injector connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Short):
Standard Resistance (Check for Short):
(d) Reconnect the injector connector.
(e) Reconnect the ECM connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - FUEL INJECTOR FOR PORT INJECTION)
OK -- Continue to next step.
5. 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