P0268
DTC P0262 CYLINDER 1-INJECTOR CIRCUIT HIGHDTC P0265 CYLINDER 2-INJECTOR CIRCUIT HIGH
DTC P0268 CYLINDER 3-INJECTOR CIRCUIT HIGH
DTC P0271 CYLINDER 4-INJECTOR CIRCUIT HIGH
Component Location:
GENERAL DESCRIPTION
Based on information from various sensors, the ECM measures the fuel injection amount. The fuel injector is a solenoid-operated valve and the fuel injection amount is controlled by length of time the fuel injector is held open. The ECM controls each injector by grounding the control circuit. When the ECM energizes the injector by grounding the control circuit, the circuit voltage should be low (theoretically 0 V) and the fuel is injected. When the ECM de-energizes the injector by opening control circuit, the fuel injector is closed and circuit voltage should momentarily peak.
DTC DESCRIPTION
ECM sets DTC P0262 if the ECM detects that injector (Cylinder #1) control circuit is open or shorted to battery voltage.
ECM sets DTC P0265 if the ECM detects that injector (Cylinder #2) control circuit is open or shorted to battery voltage.
ECM sets DTC P0268 if the ECM detects that injector (Cylinder #3) control circuit is open or shorted to battery voltage.
ECM sets DTC P0271 if the ECM detects that injector (Cylinder #4) control circuit is open or shorted to battery voltage.
DTC Detecting Condition:
Specification:
Schematic Diagram:
MONITOR DTC STATUS
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) to select DTC information from the DTCs menu.
3. Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Read "DTC Status" parameter.
5. Is parameter displayed "History (Not Present) fault"?
NOTE:
- History (Not Present) fault : DTC occurred but has been cleared.
- Present fault : DTC is occurring at present time.
YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO - Go to next step as below
COMPONENT INSPECTION
1. Ignition "OFF".
2. Disconnect injector connector.
Specification:
3. Measure resistance between terminals 1 and 2 of the injector connector (Component side)
4. Is resistance within the specification?
YES - Go to next step as below
NO - Check injector for contamination, deterioration, or damage. Substitute with a known-good injector and check for proper operation. If the problem is corrected, replace injector and then go to "Verification of Vehicle Repair" procedure
POWER CIRCUIT INSPECTION
1. Ignition "ON" & Engine "OFF".
2. Measure voltage between terminal 1 of the injector harness connector and chassis ground.
Specification : Approx. B+
3. Is voltage within the specification?
YES - Go to "Control Circuit Inspection" procedure
NO - Check for a open in the power supply circuit between the main relay and the Injector. Check for open or blown 10 A injector fuse Repair as necessary and go to "Verification of Vehicle Repair" procedure
CONTROL CIRCUIT INSPECTION
1. Measure voltage between terminal 2 of the injector harness connector and chassis ground
Specification : Approx. 4 - 5 V
2. Is voltage within the specification?
YES - Go to next step as below
NO - Check control circuit for open or short. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES - Repair as necessary and go to "Verification of Vehicle Repair" procedure
NO - Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Press F4 (DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
3. Read "DTC Status" parameter.
4. Is parameter displayed "History (Not Present) fault"?
YES - System performing to specification at this time. Clear the DTC
NO - Go to the applicable troubleshooting procedure.